Mathaversaries

2nd December, 1971   -   19,131 Days Ago

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What is this?

The practice of celebrating the number of orbits a person has lived or a marriage has lasted been tradition for as long as we have measured the passing of years.

But why do we attach so much importance to that particular astronomical curiosity? Why put special emphasis on multiples of ten of these particular planetary pirouettes? Why not celebrate 1,000 days of marriage? Or 150 Mercury years alive? Or 5 Cobalt 60 half-lives?

Mathaversaries can help you remember these uncommon milestones, and ensure you never miss an excuse to celebrate.

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Hide Planets   |   Hide Constants   |   Hide Half-Lives

DateDaysEvent
18 May 2024 19,161 3,000 Pluto days
1 August 2024 19,236 28 Mars years
15 August 2024 19,250 10 Cobalt 60 half-lives
24 November 2024 19,351 220 Mercury years
2 December 2024 19,359 53 Earth years
25 February 2025 19,444 28,000,000 minutes
24 April 2025 19,502 33 Golden ratio years
28 April 2025 19,506 17 Pi years
26 August 2025 19,626 38 Root-2 years
14 September 2025 19,645 31 galactic ticks
2 December 2025 19,724 54 Earth years
3 January 2026 19,756 3 Saros Cycles
12 April 2026 19,855 20 e years
19 June 2026 19,923 29 Mars years
4 September 2026 20,000 20,000 days
2 December 2026 20,089 55 Earth years
6 December 2026 20,093 34 Golden ratio years
21 January 2027 20,139 29,000,000 minutes
24 January 2027 20,142 39 Root-2 years
15 April 2027 20,223 90 Venus years
23 April 2027 20,231 230 Mercury years
9 June 2027 20,278 32 galactic ticks
2 December 2027 20,454 56 Earth years
21 December 2027 20,473 1 reign of Henry III
15 April 2028 20,589 50 Full moon cycles
6 May 2028 20,610 30 Mars years
19 June 2028 20,654 18 Pi years
24 June 2028 20,659 40 Root-2 years
19 July 2028 20,684 35 Golden ratio years
9 November 2028 20,797 60 Draconic years
2 December 2028 20,820 57 Earth years
6 December 2028 20,824 2 reigns of Alfred the Great
15 December 2028 20,833 30,000,000 minutes
15 December 2028 20,833 500,000 hours
15 December 2028 20,833 2 megawarhols
30 December 2028 20,848 21 e years
4 March 2029 20,912 33 galactic ticks
31 May 2029 21,000 21,000 days
18 September 2029 21,110 240 Mercury years
22 November 2029 21,175 41 Root-2 years
22 November 2029 21,175 11 Cobalt 60 half-lives
2 December 2029 21,185 58 Earth years
2 March 2030 21,275 36 Golden ratio years
23 March 2030 21,296 2 Curium 243 half-lives
24 March 2030 21,297 31 Mars years
1 June 2030 21,366 6 reigns of Richard the Lionheart
10 November 2030 21,528 31,000,000 minutes
28 November 2030 21,546 34 galactic ticks
2 December 2030 21,550 59 Earth years
26 March 2031 21,664 5 Jupiter years
26 March 2031 21,664 2 Saturn years
22 April 2031 21,691 42 Root-2 years
10 August 2031 21,801 19 Pi years
18 September 2031 21,840 800 lunar orbits
18 September 2031 21,840 22 e years
14 October 2031 21,866 37 Golden ratio years
2 December 2031 21,915 60 Earth years
9 February 2032 21,984 32 Mars years
15 February 2032 21,990 250 Mercury years
25 February 2032 22,000 22,000 days
23 August 2032 22,180 35 galactic ticks
20 September 2032 22,208 43 Root-2 years
4 October 2032 22,222 22,222 days
4 October 2032 22,222 32,000,000 minutes
2 December 2032 22,281 61 Earth years
27 May 2033 22,457 38 Golden ratio years
9 June 2033 22,470 100 Venus years
19 July 2033 22,510 5 Hydrogen 3 (Tritium) half-lives
2 December 2033 22,646 62 Earth years
27 December 2033 22,671 33 Mars years
18 February 2034 22,724 44 Root-2 years
18 May 2034 22,813 36 galactic ticks
7 June 2034 22,833 23 e years
14 July 2034 22,870 260 Mercury years
30 August 2034 22,917 33,000,000 minutes
1 October 2034 22,949 20 Pi years
21 November 2034 23,000 23,000 days
2 December 2034 23,011 63 Earth years
8 January 2035 23,048 39 Golden ratio years
1 March 2035 23,100 12 Cobalt 60 half-lives
18 April 2035 23,148 2 gigaseconds
5 July 2035 23,226 1 reign of Queen Victoria
14 November 2035 23,358 34 Mars years
2 December 2035 23,376 64 Earth years
11 February 2036 23,447 37 galactic ticks
24 July 2036 23,611 34,000,000 minutes
21 August 2036 23,639 40 Golden ratio years
2 December 2036 23,742 65 Earth years
9 December 2036 23,749 270 Mercury years
24 February 2037 23,826 24 e years
9 May 2037 23,900 5 Californium 250 half-lives
17 August 2037 24,000 24,000 days
1 October 2037 24,045 35 Mars years
6 November 2037 24,081 38 galactic ticks
21 November 2037 24,096 21 Pi years
2 December 2037 24,107 66 Earth years
4 April 2038 24,230 41 Golden ratio years
7 May 2038 24,263 70 Draconic years
18 June 2038 24,305 35,000,000 minutes
2 December 2038 24,472 67 Earth years
10 March 2039 24,570 900 lunar orbits
8 May 2039 24,629 280 Mercury years
25 July 2039 24,707 60 Full moon cycles
1 August 2039 24,714 39 galactic ticks
4 August 2039 24,717 110 Venus years
19 August 2039 24,732 36 Mars years
14 November 2039 24,819 25 e years
16 November 2039 24,821 42 Golden ratio years
2 December 2039 24,837 68 Earth years
1 March 2040 24,927 7 reigns of Richard the Lionheart
13 May 2040 25,000 25,000 days
13 May 2040 25,000 36,000,000 minutes
13 May 2040 25,000 600,000 hours
7 June 2040 25,025 13 Cobalt 60 half-lives
2 December 2040 25,203 69 Earth years
12 January 2041 25,244 22 Pi years
26 April 2041 25,348 40 galactic ticks
29 June 2041 25,412 43 Golden ratio years
6 July 2041 25,419 37 Mars years
3 October 2041 25,508 290 Mercury years
12 November 2041 25,548 4,000 Pluto days
2 December 2041 25,568 70 Earth years
7 April 2042 25,694 37,000,000 minutes
4 July 2042 25,782 1 reign of Queen Elizabeth II
2 August 2042 25,811 26 e years
2 December 2042 25,933 71 Earth years
20 January 2043 25,982 41 galactic ticks
3 February 2043 25,996 6 Jupiter years
7 February 2043 26,000 26,000 days
10 February 2043 26,003 44 Golden ratio years
24 May 2043 26,106 38 Mars years
2 December 2043 26,298 72 Earth years
14 January 2044 26,341 4 Saros Cycles
1 March 2044 26,388 300 Mercury years
2 March 2044 26,389 38,000,000 minutes
4 March 2044 26,391 23 Pi years
14 October 2044 26,615 42 galactic ticks
2 December 2044 26,664 73 Earth years
10 April 2045 26,793 39 Mars years
21 April 2045 26,804 27 e years
14 September 2045 26,950 14 Cobalt 60 half-lives
28 September 2045 26,964 120 Venus years
3 November 2045 27,000 27,000 days
15 November 2045 27,012 6 Hydrogen 3 (Tritium) half-lives
2 December 2045 27,029 74 Earth years
25 January 2046 27,083 39,000,000 minutes
10 July 2046 27,249 43 galactic ticks
29 July 2046 27,268 310 Mercury years
30 August 2046 27,300 1,000 lunar orbits
2 December 2046 27,394 75 Earth years
26 February 2047 27,480 40 Mars years
25 April 2047 27,538 24 Pi years
18 June 2047 27,592 2 reigns of Henry VIII
3 November 2047 27,730 80 Draconic years
23 November 2047 27,750 2 reigns of Æthelred the Unready
2 December 2047 27,759 76 Earth years
21 December 2047 27,778 40,000,000 minutes
9 January 2048 27,797 28 e years
4 April 2048 27,883 44 galactic ticks
30 July 2048 28,000 28,000 days
2 December 2048 28,125 77 Earth years
24 December 2048 28,147 320 Mercury years
13 January 2049 28,167 41 Mars years
14 November 2049 28,472 41,000,000 minutes
30 November 2049 28,488 8 reigns of Richard the Lionheart
2 December 2049 28,490 78 Earth years
29 December 2049 28,517 45 galactic ticks
18 May 2050 28,657 23rd Fibonacci number days
10 June 2050 28,680 6 Californium 250 half-lives
16 June 2050 28,686 25 Pi years
28 September 2050 28,790 29 e years
2 November 2050 28,825 70 Full moon cycles
1 December 2050 28,854 42 Mars years
2 December 2050 28,855 79 Earth years
22 December 2050 28,875 15 Cobalt 60 half-lives
26 April 2051 29,000 29,000 days
23 May 2051 29,027 330 Mercury years
23 September 2051 29,150 46 galactic ticks
9 October 2051 29,166 42,000,000 minutes
10 October 2051 29,167 700,000 hours
23 November 2051 29,211 130 Venus years
2 December 2051 29,220 80 Earth years
18 October 2052 29,541 43 Mars years
2 December 2052 29,586 81 Earth years
16 June 2053 29,782 30 e years
18 June 2053 29,784 47 galactic ticks
6 August 2053 29,833 26 Pi years
3 September 2053 29,861 43,000,000 minutes
18 October 2053 29,906 340 Mercury years
2 December 2053 29,951 82 Earth years
20 January 2054 30,000 30,000 days
19 February 2054 30,030 1,100 lunar orbits
5 September 2054 30,228 44 Mars years
24 September 2054 30,247 4,321 weeks
2 December 2054 30,316 83 Earth years
15 December 2054 30,329 7 Jupiter years
14 March 2055 30,418 48 galactic ticks
29 July 2055 30,555 44,000,000 minutes
2 December 2055 30,681 84 Earth years
5 March 2056 30,775 31 e years
16 March 2056 30,786 350 Mercury years
30 March 2056 30,800 16 Cobalt 60 half-lives
23 July 2056 30,915 45 Mars years
27 September 2056 30,981 27 Pi years
16 October 2056 31,000 31,000 days
2 December 2056 31,047 85 Earth years
6 December 2056 31,051 49 galactic ticks
30 April 2057 31,196 90 Draconic years
9 June 2057 31,236 3 reigns of Alfred the Great
23 June 2057 31,250 45,000,000 minutes
23 June 2057 31,250 3 megawarhols
2 December 2057 31,412 86 Earth years
17 January 2058 31,458 140 Venus years
14 March 2058 31,514 7 Hydrogen 3 (Tritium) half-lives
10 June 2058 31,602 46 Mars years
13 August 2058 31,666 360 Mercury years
1 September 2058 31,685 50 galactic ticks
23 November 2058 31,768 32 e years
2 December 2058 31,777 87 Earth years
9 May 2059 31,935 5,000 Pluto days
18 May 2059 31,944 46,000,000 minutes
18 May 2059 31,944 3 Curium 243 half-lives
13 July 2059 32,000 32,000 days
31 August 2059 32,049 9 reigns of Richard the Lionheart
18 November 2059 32,128 28 Pi years
2 December 2059 32,142 88 Earth years
27 April 2060 32,289 47 Mars years
27 May 2060 32,319 51 galactic ticks
12 August 2060 32,396 2 reigns of Queen Elizabeth I
20 November 2060 32,496 3 Saturn years
2 December 2060 32,508 89 Earth years
8 January 2061 32,545 370 Mercury years
12 April 2061 32,639 47,000,000 minutes
7 July 2061 32,725 17 Cobalt 60 half-lives
11 August 2061 32,760 1,200 lunar orbits
12 August 2061 32,761 33 e years
2 December 2061 32,873 90 Earth years
25 January 2062 32,927 5 Saros Cycles
9 February 2062 32,942 80 Full moon cycles
19 February 2062 32,952 52 galactic ticks
15 March 2062 32,976 48 Mars years
8 April 2062 33,000 33,000 days
2 December 2062 33,238 91 Earth years
9 January 2063 33,276 29 Pi years
7 March 2063 33,333 33,333 days
7 March 2063 33,333 48,000,000 minutes
7 March 2063 33,333 800,000 hours
7 June 2063 33,425 380 Mercury years
12 July 2063 33,460 7 Californium 250 half-lives
15 November 2063 33,586 53 galactic ticks
2 December 2063 33,603 92 Earth years
31 January 2064 33,663 49 Mars years
13 March 2064 33,705 150 Venus years
30 April 2064 33,753 34 e years
2 December 2064 33,969 93 Earth years
2 January 2065 34,000 34,000 days
30 January 2065 34,028 49,000,000 minutes
10 August 2065 34,220 54 galactic ticks
2 November 2065 34,304 390 Mercury years
2 December 2065 34,334 94 Earth years
18 December 2065 34,350 50 Mars years
1 March 2066 34,423 30 Pi years
14 October 2066 34,650 18 Cobalt 60 half-lives
26 October 2066 34,662 100 Draconic years
26 October 2066 34,662 8 Jupiter years
2 December 2066 34,699 95 Earth years
25 December 2066 34,722 3 gigaseconds
25 December 2066 34,722 50,000,000 minutes
18 January 2067 34,746 35 e years
6 May 2067 34,854 55 galactic ticks
29 September 2067 35,000 35,000 days
5 November 2067 35,037 51 Mars years
2 December 2067 35,064 96 Earth years
31 March 2068 35,184 400 Mercury years
18 November 2068 35,416 51,000,000 minutes
2 December 2068 35,430 97 Earth years
28 January 2069 35,487 56 galactic ticks
31 January 2069 35,490 1,300 lunar orbits
21 April 2069 35,570 31 Pi years
31 May 2069 35,610 10 reigns of Richard the Lionheart
22 September 2069 35,724 52 Mars years
7 October 2069 35,739 36 e years
2 December 2069 35,795 98 Earth years
8 May 2070 35,952 160 Venus years
25 June 2070 36,000 36,000 days
11 July 2070 36,016 8 Hydrogen 3 (Tritium) half-lives
28 August 2070 36,064 410 Mercury years
14 October 2070 36,111 52,000,000 minutes
24 October 2070 36,121 57 galactic ticks
2 December 2070 36,160 99 Earth years
10 August 2071 36,411 53 Mars years
2 December 2071 36,525 100 Earth years
21 January 2072 36,575 19 Cobalt 60 half-lives
12 June 2072 36,718 32 Pi years
26 June 2072 36,732 37 e years
19 July 2072 36,755 58 galactic ticks
7 September 2072 36,805 53,000,000 minutes
2 December 2072 36,891 101 Earth years
23 January 2073 36,943 420 Mercury years
21 March 2073 37,000 37,000 days
20 May 2073 37,060 90 Full moon cycles
27 June 2073 37,098 54 Mars years
2 December 2073 37,256 102 Earth years
13 April 2074 37,388 59 galactic ticks
3 August 2074 37,500 54,000,000 minutes
3 August 2074 37,500 900,000 hours
2 December 2074 37,621 103 Earth years
15 March 2075 37,724 38 e years
15 May 2075 37,785 55 Mars years
22 June 2075 37,823 430 Mercury years
3 August 2075 37,865 33 Pi years
2 December 2075 37,986 104 Earth years
16 December 2075 38,000 38,000 days
7 January 2076 38,022 60 galactic ticks
22 April 2076 38,128 110 Draconic years
27 June 2076 38,194 55,000,000 minutes
2 July 2076 38,199 170 Venus years
23 July 2076 38,220 1,400 lunar orbits
12 August 2076 38,240 8 Californium 250 half-lives
2 November 2076 38,322 6,000 Pluto days
2 December 2076 38,352 105 Earth years
1 April 2077 38,472 56 Mars years
29 April 2077 38,500 20 Cobalt 60 half-lives
2 October 2077 38,656 61 galactic ticks
17 November 2077 38,702 440 Mercury years
2 December 2077 38,717 39 e years
2 December 2077 38,717 106 Earth years
23 May 2078 38,889 56,000,000 minutes
5 September 2078 38,994 9 Jupiter years
11 September 2078 39,000 39,000 days
24 September 2078 39,013 34 Pi years
2 December 2078 39,082 107 Earth years
17 February 2079 39,159 57 Mars years
1 March 2079 39,171 11 reigns of Richard the Lionheart
27 June 2079 39,289 62 galactic ticks
2 December 2079 39,447 108 Earth years
5 February 2080 39,512 6 Saros Cycles
15 April 2080 39,582 450 Mercury years
16 April 2080 39,583 57,000,000 minutes
21 August 2080 39,710 40 e years
2 December 2080 39,813 109 Earth years
4 January 2081 39,846 58 Mars years
22 March 2081 39,923 63 galactic ticks
7 June 2081 40,000 40,000 days
14 November 2081 40,160 35 Pi years
2 December 2081 40,178 110 Earth years
12 March 2082 40,278 58,000,000 minutes
6 August 2082 40,425 21 Cobalt 60 half-lives
27 August 2082 40,446 180 Venus years
12 September 2082 40,462 460 Mercury years
7 November 2082 40,518 9 Hydrogen 3 (Tritium) half-lives
22 November 2082 40,533 59 Mars years
2 December 2082 40,543 111 Earth years
16 December 2082 40,557 64 galactic ticks
11 May 2083 40,703 41 e years
2 December 2083 40,908 112 Earth years
9 January 2084 40,946 2 reigns of Henry III
13 January 2084 40,950 1,500 lunar orbits
4 February 2084 40,972 59,000,000 minutes
3 March 2084 41,000 41,000 days
28 August 2084 41,178 100 Full moon cycles
10 September 2084 41,191 65 galactic ticks
9 October 2084 41,220 60 Mars years
2 December 2084 41,274 113 Earth years
5 January 2085 41,308 36 Pi years
7 February 2085 41,341 470 Mercury years
26 March 2085 41,388 3 reigns of Henry VIII
18 October 2085 41,594 120 Draconic years
18 November 2085 41,625 3 reigns of Æthelred the Unready
2 December 2085 41,639 114 Earth years
11 December 2085 41,648 4 reigns of Alfred the Great
29 December 2085 41,666 60,000,000 minutes
30 December 2085 41,667 1,000,000 hours
30 December 2085 41,667 4 megawarhols
27 January 2086 41,695 42 e years
5 June 2086 41,824 66 galactic ticks
27 August 2086 41,907 61 Mars years
28 November 2086 42,000 42,000 days
2 December 2086 42,004 115 Earth years
7 July 2087 42,221 480 Mercury years
13 November 2087 42,350 22 Cobalt 60 half-lives
24 November 2087 42,361 61,000,000 minutes
2 December 2087 42,369 116 Earth years
26 February 2088 42,455 37 Pi years
29 February 2088 42,458 67 galactic ticks
12 July 2088 42,592 4 Curium 243 half-lives
14 July 2088 42,594 62 Mars years
16 October 2088 42,688 43 e years
21 October 2088 42,693 190 Venus years
29 November 2088 42,732 12 reigns of Richard the Lionheart
2 December 2088 42,735 117 Earth years
24 August 2089 43,000 43,000 days
13 September 2089 43,020 9 Californium 250 half-lives
18 October 2089 43,055 62,000,000 minutes
24 November 2089 43,092 68 galactic ticks
2 December 2089 43,100 490 Mercury years
2 December 2089 43,100 118 Earth years
1 June 2090 43,281 63 Mars years
17 July 2090 43,327 10 Jupiter years
18 July 2090 43,328 4 Saturn years
2 December 2090 43,465 119 Earth years
18 April 2091 43,602 38 Pi years
5 July 2091 43,680 1,600 lunar orbits
6 July 2091 43,681 44 e years
19 August 2091 43,725 69 galactic ticks
13 September 2091 43,750 63,000,000 minutes
2 December 2091 43,830 120 Earth years
18 April 2092 43,968 64 Mars years
30 April 2092 43,980 500 Mercury years
20 May 2092 44,000 44,000 days
2 December 2092 44,196 121 Earth years
19 February 2093 44,275 23 Cobalt 60 half-lives
14 May 2093 44,359 70 galactic ticks
7 August 2093 44,444 44,444 days
7 August 2093 44,444 64,000,000 minutes
2 December 2093 44,561 122 Earth years
6 March 2094 44,655 65 Mars years
29 April 2094 44,709 7,000 Pluto days
9 June 2094 44,750 39 Pi years
27 September 2094 44,860 510 Mercury years
2 December 2094 44,926 123 Earth years
16 December 2094 44,940 200 Venus years
7 February 2095 44,993 71 galactic ticks
14 February 2095 45,000 45,000 days
6 March 2095 45,020 10 Hydrogen 3 (Tritium) half-lives
16 April 2095 45,061 130 Draconic years
3 July 2095 45,139 65,000,000 minutes
2 December 2095 45,291 124 Earth years
7 December 2095 45,296 110 Full moon cycles
22 January 2096 45,342 66 Mars years
1 November 2096 45,626 72 galactic ticks
2 December 2096 45,657 125 Earth years
22 February 2097 45,739 520 Mercury years
27 May 2097 45,833 66,000,000 minutes
27 May 2097 45,833 1,100,000 hours
30 July 2097 45,897 40 Pi years
10 November 2097 46,000 46,000 days
2 December 2097 46,022 126 Earth years
9 December 2097 46,029 67 Mars years
15 February 2098 46,097 7 Saros Cycles
29 May 2098 46,200 24 Cobalt 60 half-lives
28 July 2098 46,260 73 galactic ticks
30 August 2098 46,293 13 reigns of Richard the Lionheart
2 September 2098 46,296 4 gigaseconds
13 November 2098 46,368 24th Fibonacci number days
2 December 2098 46,387 127 Earth years
25 December 2098 46,410 1,700 lunar orbits
5 February 2099 46,452 2 reigns of Queen Victoria
21 April 2099 46,527 67,000,000 minutes
22 July 2099 46,619 530 Mercury years
27 October 2099 46,716 68 Mars years
2 December 2099 46,752 128 Earth years
23 April 2100 46,894 74 galactic ticks
7 August 2100 47,000 47,000 days
21 September 2100 47,045 41 Pi years
2 December 2100 47,117 129 Earth years
10 February 2101 47,187 210 Venus years
17 March 2101 47,222 68,000,000 minutes
14 September 2101 47,403 69 Mars years
2 December 2101 47,482 130 Earth years
18 December 2101 47,498 540 Mercury years
17 January 2102 47,528 75 galactic ticks
29 May 2102 47,660 11 Jupiter years
16 October 2102 47,800 10 Californium 250 half-lives
2 December 2102 47,847 131 Earth years
9 February 2103 47,916 69,000,000 minutes
4 May 2103 48,000 48,000 days
2 August 2103 48,090 70 Mars years
6 September 2103 48,125 25 Cobalt 60 half-lives
12 October 2103 48,161 76 galactic ticks
12 November 2103 48,192 42 Pi years
2 December 2103 48,212 132 Earth years
16 May 2104 48,378 550 Mercury years
12 October 2104 48,527 140 Draconic years
2 December 2104 48,578 133 Earth years
18 December 2104 48,594 3 reigns of Queen Elizabeth I
4 January 2105 48,611 70,000,000 minutes
19 June 2105 48,777 71 Mars years
7 July 2105 48,795 77 galactic ticks
2 December 2105 48,943 134 Earth years
28 January 2106 49,000 49,000 days
17 June 2106 49,140 1,800 lunar orbits
13 October 2106 49,258 560 Mercury years
29 November 2106 49,305 71,000,000 minutes
2 December 2106 49,308 135 Earth years
3 January 2107 49,340 43 Pi years
18 March 2107 49,414 120 Full moon cycles
2 April 2107 49,429 78 galactic ticks
7 April 2107 49,434 220 Venus years
7 May 2107 49,464 72 Mars years
4 July 2107 49,522 11 Hydrogen 3 (Tritium) half-lives
2 December 2107 49,673 136 Earth years
31 May 2108 49,854 14 reigns of Richard the Lionheart
24 October 2108 50,000 50,000 days
24 October 2108 50,000 72,000,000 minutes
24 October 2108 50,000 1,200,000 hours
End of time ∞ Infinity-versary

Hide Planets   |   Hide Constants   |   Hide Half-Lives

DateDaysEvent
3 December 1971 1 One day
8 December 1971 6 1st even-perfect-number days
9 December 1971 7 One week
13 December 1971 11 1 Mooch
29 December 1971 27 1 lunar orbit
30 December 1971 28 2nd even-perfect-number days
2 January 1972 31 One month
13 January 1972 42 Life-universe-and-everything
26 January 1972 55 10th Fibonacci number days
9 February 1972 69 Naughty-versary
10 February 1972 70 Smallest-weird-number days
29 February 1972 89 11th Fibonacci number days
11 March 1972 100 100 days
3 April 1972 123 123 days
24 April 1972 144 12th Fibonacci number days
19 June 1972 200 200 days
22 July 1972 233 13th Fibonacci number days
31 August 1972 273 10 lunar orbits
27 September 1972 300 300 days
27 September 1972 300 Sparta!
18 October 1972 321 321 days
2 December 1972 366 1 Earth year
13 December 1972 377 14th Fibonacci number days
5 January 1973 400 400 days
9 January 1973 404 Anniversary Not Found
11 April 1973 496 3rd even-perfect-number days
15 April 1973 500 500 days
18 April 1973 503 Anniversary Forbidden
1 May 1973 516 1 Root-2 years
15 July 1973 591 1 Golden ratio years
24 July 1973 600 600 days
3 August 1973 610 15th Fibonacci number days
27 August 1973 634 1 galactic tick
28 September 1973 666 Lucifersary
19 October 1973 687 1 Mars year
26 October 1973 694 1,000,000 minutes
1 November 1973 700 700 days
2 December 1973 731 2 Earth years
2 January 1974 762 Feynman-point days
9 February 1974 800 800 days
11 April 1974 861 123 weeks
30 April 1974 880 10 Mercury years
20 May 1974 900 900 days
15 August 1974 987 16th Fibonacci number days
21 August 1974 993 1 e years
28 August 1974 1,000 1,000 days
30 September 1974 1,033 2 Root-2 years
2 December 1974 1,096 3 Earth years
6 December 1974 1,100 100 Mooches
17 December 1974 1,111 1,111 days
22 January 1975 1,147 1 Pi years
26 February 1975 1,182 2 Golden ratio years
27 March 1975 1,211 4th look-and-say number days
19 April 1975 1,234 1,234 days
22 May 1975 1,267 2 galactic ticks
31 July 1975 1,337 1337 days
28 August 1975 1,365 50 lunar orbits
6 September 1975 1,374 2 Mars years
21 September 1975 1,389 2,000,000 minutes
2 December 1975 1,461 4 Earth years
28 February 1976 1,549 3 Root-2 years
16 April 1976 1,597 17th Fibonacci number days
26 August 1976 1,729 Hardy-Ramanujan-number days
25 September 1976 1,759 20 Mercury years
9 October 1976 1,773 3 Golden ratio years
2 December 1976 1,827 5 Earth years
14 February 1977 1,901 3 galactic ticks
10 March 1977 1,925 1 Cobalt 60 half-lives
9 May 1977 1,985 2 e years
11 May 1977 1,987 300th prime number (1987) days
24 May 1977 2,000 2,000 days
24 July 1977 2,061 3 Mars years
29 July 1977 2,066 4 Root-2 years
15 August 1977 2,083 3,000,000 minutes
2 December 1977 2,192 6 Earth years
1 January 1978 2,222 2,222 days
26 January 1978 2,247 321 weeks
26 January 1978 2,247 10 Venus years
15 March 1978 2,295 2 Pi years
31 March 1978 2,311 5th Euclid-prime days
23 May 1978 2,364 4 Golden ratio years
10 November 1978 2,535 4 galactic ticks
2 December 1978 2,557 7 Earth years
27 December 1978 2,582 5 Root-2 years
29 December 1978 2,584 18th Fibonacci number days
22 February 1979 2,639 30 Mercury years
24 May 1979 2,730 100 lunar orbits
11 June 1979 2,748 4 Mars years
11 July 1979 2,778 4,000,000 minutes
30 September 1979 2,859 The amount of time it takes a particle of light to cross one octillion hydrogen molecules
2 December 1979 2,922 8 Earth years
4 January 1980 2,955 5 Golden ratio years
27 January 1980 2,978 3 e years
18 February 1980 3,000 3,000 days
27 May 1980 3,099 6 Root-2 years
5 August 1980 3,169 5 galactic ticks
29 August 1980 3,193 500 Pluto days
2 December 1980 3,288 9 Earth years
16 January 1981 3,333 3,333 days
28 April 1981 3,435 5 Mars years
5 May 1981 3,442 3 Pi years
29 May 1981 3,466 10 Draconic years
4 June 1981 3,472 5,000,000 minutes
20 July 1981 3,518 40 Mercury years
17 August 1981 3,546 6 Golden ratio years
1 September 1981 3,561 1 reign of Richard the Lionheart
25 October 1981 3,615 7 Root-2 years
2 December 1981 3,653 10 Earth years
30 April 1982 3,802 6 galactic ticks
17 June 1982 3,850 2 Cobalt 60 half-lives
16 October 1982 3,971 4 e years
14 November 1982 4,000 4,000 days
2 December 1982 4,018 11 Earth years
26 February 1983 4,104 Second-positive-integer-which-can-be-expressed-as-the-sum-of-two-positive-cubes-in-two-different-ways days
12 March 1983 4,118 10 Full moon cycles
16 March 1983 4,122 6 Mars years
26 March 1983 4,132 8 Root-2 years
31 March 1983 4,137 7 Golden ratio years
30 April 1983 4,167 6,000,000 minutes
30 April 1983 4,167 100,000 hours
14 May 1983 4,181 19th Fibonacci number days
1 October 1983 4,321 4,321 days
13 October 1983 4,333 1 Jupiter year
2 December 1983 4,383 12 Earth years
17 December 1983 4,398 50 Mercury years
24 January 1984 4,436 7 galactic ticks
1 February 1984 4,444 4,444 days
22 March 1984 4,494 20 Venus years
30 March 1984 4,502 1 Hydrogen 3 (Tritium) half-lives
26 June 1984 4,590 4 Pi years
23 August 1984 4,648 9 Root-2 years
11 November 1984 4,728 8 Golden ratio years
2 December 1984 4,749 13 Earth years
2 January 1985 4,780 1 Californium 250 half-lives
31 January 1985 4,809 7 Mars years
24 March 1985 4,861 7,000,000 minutes
5 July 1985 4,964 5 e years
10 August 1985 5,000 5,000 days
19 September 1985 5,040 8th colossally-abundant-number days
19 October 1985 5,070 8 galactic ticks
2 December 1985 5,114 14 Earth years
22 January 1986 5,165 10 Root-2 years
15 May 1986 5,278 60 Mercury years
25 June 1986 5,319 9 Golden ratio years
13 November 1986 5,460 200 lunar orbits
2 December 1986 5,479 15 Earth years
19 December 1986 5,496 8 Mars years
16 February 1987 5,555 5,555 days
17 February 1987 5,556 8,000,000 minutes
22 June 1987 5,681 11 Root-2 years
14 July 1987 5,703 9 galactic ticks
17 August 1987 5,737 5 Pi years
24 September 1987 5,775 3 Cobalt 60 half-lives
2 December 1987 5,844 16 Earth years
6 February 1988 5,910 10 Golden ratio years
23 March 1988 5,956 6 e years
6 May 1988 6,000 6,000 days
10 October 1988 6,157 70 Mercury years
27 October 1988 6,174 Kaprekar's-constant days
5 November 1988 6,183 9 Mars years
20 November 1988 6,198 12 Root-2 years
2 December 1988 6,210 17 Earth years
11 January 1989 6,250 9,000,000 minutes
8 April 1989 6,337 10 galactic ticks
28 May 1989 6,387 1,000 Pluto days
19 September 1989 6,501 11 Golden ratio years
2 December 1989 6,575 18 Earth years
12 December 1989 6,585 1 Saros Cycle
3 March 1990 6,666 6,666 days
20 April 1990 6,714 13 Root-2 years
17 May 1990 6,741 30 Venus years
10 June 1990 6,765 20th Fibonacci number days
23 September 1990 6,870 10 Mars years
8 October 1990 6,885 6 Pi years
24 November 1990 6,932 20 Draconic years
2 December 1990 6,940 19 Earth years
6 December 1990 6,944 10,000,000 minutes
11 December 1990 6,949 7 e years
2 January 1991 6,971 11 galactic ticks
31 January 1991 7,000 7,000 days
9 March 1991 7,037 80 Mercury years
3 May 1991 7,092 12 Golden ratio years
2 June 1991 7,122 2 reigns of Richard the Lionheart
18 September 1991 7,230 14 Root-2 years
2 December 1991 7,305 20 Earth years
10 August 1992 7,557 11 Mars years
26 September 1992 7,604 12 galactic ticks
31 October 1992 7,639 11,000,000 minutes
2 December 1992 7,671 21 Earth years
14 December 1992 7,683 13 Golden ratio years
31 December 1992 7,700 4 Cobalt 60 half-lives
16 February 1993 7,747 15 Root-2 years
18 March 1993 7,777 7,777 days
4 August 1993 7,916 90 Mercury years
30 August 1993 7,942 8 e years
27 October 1993 8,000 8,000 days
28 November 1993 8,032 7 Pi years
2 December 1993 8,036 22 Earth years
4 March 1994 8,128 4th even-perfect-number days
5 May 1994 8,190 300 lunar orbits
20 June 1994 8,236 20 Full moon cycles
22 June 1994 8,238 13 galactic ticks
28 June 1994 8,244 12 Mars years
17 July 1994 8,263 16 Root-2 years
28 July 1994 8,274 14 Golden ratio years
25 September 1994 8,333 12,000,000 minutes
25 September 1994 8,333 200,000 hours
2 December 1994 8,401 23 Earth years
27 July 1995 8,638 1,234 weeks
23 August 1995 8,665 2 Jupiter years
2 December 1995 8,766 24 Earth years
16 December 1995 8,780 17 Root-2 years
1 January 1996 8,796 100 Mercury years
10 March 1996 8,865 15 Golden ratio years
17 March 1996 8,872 14 galactic ticks
2 April 1996 8,888 8,888 days
15 May 1996 8,931 13 Mars years
19 May 1996 8,935 9 e years
11 July 1996 8,988 40 Venus years
23 July 1996 9,000 9,000 days
27 July 1996 9,004 2 Hydrogen 3 (Tritium) half-lives
20 August 1996 9,028 13,000,000 minutes
2 December 1996 9,132 25 Earth years
18 January 1997 9,179 8 Pi years
15 May 1997 9,296 18 Root-2 years
22 October 1997 9,456 16 Golden ratio years
2 December 1997 9,497 26 Earth years
11 December 1997 9,506 15 galactic ticks
3 February 1998 9,560 2 Californium 250 half-lives
2 April 1998 9,618 14 Mars years
9 April 1998 9,625 5 Cobalt 60 half-lives
30 May 1998 9,676 110 Mercury years
15 July 1998 9,722 14,000,000 minutes
14 October 1998 9,813 19 Root-2 years
2 December 1998 9,862 27 Earth years
5 February 1999 9,927 10 e years
18 April 1999 9,999 9,999 days
19 April 1999 10,000 10,000 days
5 June 1999 10,047 17 Golden ratio years
5 September 1999 10,139 16 galactic ticks
2 December 1999 10,227 28 Earth years
18 February 2000 10,305 15 Mars years
11 March 2000 10,327 9 Pi years
13 March 2000 10,329 20 Root-2 years
22 May 2000 10,399 30 Draconic years
4 June 2000 10,412 1 reign of Alfred the Great
9 June 2000 10,417 15,000,000 minutes
9 June 2000 10,417 1 megawarhol
25 October 2000 10,555 120 Mercury years
2 December 2000 10,593 29 Earth years
16 January 2001 10,638 18 Golden ratio years
26 January 2001 10,648 1 Curium 243 half-lives
2 March 2001 10,683 3 reigns of Richard the Lionheart
31 May 2001 10,773 17 galactic ticks
29 July 2001 10,832 1 Saturn year
12 August 2001 10,846 21 Root-2 years
25 October 2001 10,920 400 lunar orbits
25 October 2001 10,920 11 e years
20 November 2001 10,946 21st Fibonacci number days
2 December 2001 10,958 30 Earth years
5 January 2002 10,992 16 Mars years
13 January 2002 11,000 11,000 days
13 January 2002 11,000 1,000 Mooches
4 May 2002 11,111 11,111 days
4 May 2002 11,111 16,000,000 minutes
30 August 2002 11,229 19 Golden ratio years
5 September 2002 11,235 50 Venus years
2 December 2002 11,323 31 Earth years
10 January 2003 11,362 22 Root-2 years
24 February 2003 11,407 18 galactic ticks
24 March 2003 11,435 130 Mercury years
2 May 2003 11,474 10 Pi years
17 July 2003 11,550 6 Cobalt 60 half-lives
10 August 2003 11,574 1 gigasecond
23 November 2003 11,679 17 Mars years
2 December 2003 11,688 32 Earth years
28 March 2004 11,805 17,000,000 minutes
11 April 2004 11,819 20 Golden ratio years
10 June 2004 11,879 23 Root-2 years
14 July 2004 11,913 12 e years
9 October 2004 12,000 12,000 days
18 November 2004 12,040 19 galactic ticks
2 December 2004 12,054 33 Earth years
19 August 2005 12,314 140 Mercury years
19 September 2005 12,345 12,345 days
27 September 2005 12,353 30 Full moon cycles
10 October 2005 12,366 18 Mars years
8 November 2005 12,395 24 Root-2 years
23 November 2005 12,410 21 Golden ratio years
2 December 2005 12,419 34 Earth years
21 February 2006 12,500 18,000,000 minutes
21 February 2006 12,500 300,000 hours
23 June 2006 12,622 11 Pi years
14 August 2006 12,674 20 galactic ticks
22 November 2006 12,774 2,000 Pluto days
2 December 2006 12,784 35 Earth years
3 April 2007 12,906 13 e years
9 April 2007 12,912 25 Root-2 years
4 July 2007 12,998 3 Jupiter years
6 July 2007 13,000 13,000 days
7 July 2007 13,001 22 Golden ratio years
28 August 2007 13,053 19 Mars years
2 December 2007 13,149 36 Earth years
24 December 2007 13,171 2 Saros Cycles
16 January 2008 13,194 19,000,000 minutes
16 January 2008 13,194 150 Mercury years
9 May 2008 13,308 21 galactic ticks
6 September 2008 13,428 26 Root-2 years
23 October 2008 13,475 7 Cobalt 60 half-lives
30 October 2008 13,482 60 Venus years
23 November 2008 13,506 3 Hydrogen 3 (Tritium) half-lives
2 December 2008 13,515 37 Earth years
17 February 2009 13,592 23 Golden ratio years
16 April 2009 13,650 500 lunar orbits
15 July 2009 13,740 20 Mars years
13 August 2009 13,769 12 Pi years
9 September 2009 13,796 1 reign of Henry VIII
17 November 2009 13,865 40 Draconic years
27 November 2009 13,875 1 reign of Æthelred the Unready
2 December 2009 13,880 38 Earth years
11 December 2009 13,889 20,000,000 minutes
20 December 2009 13,898 14 e years
1 February 2010 13,941 22 galactic ticks
5 February 2010 13,945 27 Root-2 years
1 April 2010 14,000 14,000 days
14 June 2010 14,074 160 Mercury years
1 October 2010 14,183 24 Golden ratio years
1 December 2010 14,244 4 reigns of Richard the Lionheart
2 December 2010 14,245 39 Earth years
7 March 2011 14,340 3 Californium 250 half-lives
2 June 2011 14,427 21 Mars years
6 July 2011 14,461 28 Root-2 years
28 October 2011 14,575 23 galactic ticks
5 November 2011 14,583 21,000,000 minutes
2 December 2011 14,610 40 Earth years
14 May 2012 14,774 25 Golden ratio years
8 September 2012 14,891 15 e years
4 October 2012 14,917 13 Pi years
9 November 2012 14,953 170 Mercury years
2 December 2012 14,976 41 Earth years
3 December 2012 14,977 29 Root-2 years
26 December 2012 15,000 15,000 days
19 April 2013 15,114 22 Mars years
23 July 2013 15,209 24 galactic ticks
30 September 2013 15,278 22,000,000 minutes
2 December 2013 15,341 42 Earth years
26 December 2013 15,365 26 Golden ratio years
30 January 2014 15,400 8 Cobalt 60 half-lives
4 May 2014 15,494 30 Root-2 years
2 December 2014 15,706 43 Earth years
25 December 2014 15,729 70 Venus years
7 March 2015 15,801 23 Mars years
8 April 2015 15,833 180 Mercury years
18 April 2015 15,843 25 galactic ticks
29 May 2015 15,884 16 e years
9 August 2015 15,956 27 Golden ratio years
25 August 2015 15,972 23,000,000 minutes
22 September 2015 16,000 16,000 days
2 October 2015 16,010 31 Root-2 years
25 November 2015 16,064 14 Pi years
2 December 2015 16,071 44 Earth years
7 April 2016 16,198 1 reign of Queen Elizabeth I
6 October 2016 16,380 600 lunar orbits
2 December 2016 16,437 45 Earth years
5 January 2017 16,471 40 Full moon cycles
10 January 2017 16,476 26 galactic ticks
22 January 2017 16,488 24 Mars years
2 March 2017 16,527 32 Root-2 years
22 March 2017 16,547 28 Golden ratio years
20 July 2017 16,667 24,000,000 minutes
20 July 2017 16,667 400,000 hours
3 September 2017 16,712 190 Mercury years
2 December 2017 16,802 46 Earth years
15 February 2018 16,877 17 e years
18 June 2018 17,000 17,000 days
31 July 2018 17,043 33 Root-2 years
6 October 2018 17,110 27 galactic ticks
3 November 2018 17,138 29 Golden ratio years
2 December 2018 17,167 47 Earth years
10 December 2018 17,175 25 Mars years
15 January 2019 17,211 15 Pi years
9 May 2019 17,325 9 Cobalt 60 half-lives
15 May 2019 17,331 50 Draconic years
15 May 2019 17,331 4 Jupiter years
14 June 2019 17,361 25,000,000 minutes
2 December 2019 17,532 48 Earth years
30 December 2019 17,560 34 Root-2 years
31 January 2020 17,592 200 Mercury years
29 May 2020 17,711 22nd Fibonacci number days
16 June 2020 17,729 30 Golden ratio years
1 July 2020 17,744 28 galactic ticks
31 August 2020 17,805 5 reigns of Richard the Lionheart
27 October 2020 17,862 26 Mars years
3 November 2020 17,869 18 e years
2 December 2020 17,898 49 Earth years
18 February 2021 17,976 80 Venus years
14 March 2021 18,000 18,000 days
22 March 2021 18,008 4 Hydrogen 3 (Tritium) half-lives
8 May 2021 18,055 26,000,000 minutes
29 May 2021 18,076 35 Root-2 years
2 December 2021 18,263 50 Earth years
28 January 2022 18,320 31 Golden ratio years
8 March 2022 18,359 16 Pi years
26 March 2022 18,377 29 galactic ticks
29 June 2022 18,472 210 Mercury years
14 September 2022 18,549 27 Mars years
28 October 2022 18,593 36 Root-2 years
2 December 2022 18,628 51 Earth years
3 April 2023 18,750 27,000,000 minutes
24 July 2023 18,862 19 e years
11 September 2023 18,911 32 Golden ratio years
2 December 2023 18,993 52 Earth years
9 December 2023 19,000 19,000 days
20 December 2023 19,011 30 galactic ticks
27 March 2024 19,109 37 Root-2 years
28 March 2024 19,110 700 lunar orbits
7 April 2024 19,120 4 Californium 250 half-lives
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