Mathaversaries

20th July, 1969

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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.

Hide Planets   |   Hide Constants   |   Hide Half-Lives

DateDaysEvent
13 July 2013 16,064 14 Pi years
20 July 2013 16,071 44 Earth years
25 May 2014 16,380 600 lunar orbits
20 July 2014 16,436 45 Earth years
24 August 2014 16,471 40 Full moon cycles
10 September 2014 16,488 24 Mars years
19 October 2014 16,527 32 Root-2 years
8 November 2014 16,547 28 Golden ratio years
8 March 2015 16,667 24,000,000 minutes
8 March 2015 16,667 400,000 hours
22 April 2015 16,712 190 Mercury years
20 July 2015 16,801 46 Earth years
4 October 2015 16,877 17 e years
4 February 2016 17,000 17,000 days
18 March 2016 17,043 33 Root-2 years
21 June 2016 17,138 29 Golden ratio years
20 July 2016 17,167 47 Earth years
28 July 2016 17,175 25 Mars years
2 September 2016 17,211 15 Pi years
25 December 2016 17,325 9 Cobalt 60 half-lives
31 December 2016 17,331 50 Draconic years
31 December 2016 17,331 4 Jupiter years
30 January 2017 17,361 25,000,000 minutes
20 July 2017 17,532 48 Earth years
17 August 2017 17,560 34 Root-2 years
18 September 2017 17,592 200 Mercury years
15 January 2018 17,711 22nd Fibonacci number days
2 February 2018 17,729 30 Golden ratio years
15 June 2018 17,862 26 Mars years
22 June 2018 17,869 18 e years
20 July 2018 17,897 49 Earth years
7 October 2018 17,976 80 Venus years
31 October 2018 18,000 18,000 days
8 November 2018 18,008 4 Hydrogen 3 (Tritium) half-lives
25 December 2018 18,055 26,000,000 minutes
15 January 2019 18,076 35 Root-2 years
20 July 2019 18,262 50 Earth years
16 September 2019 18,320 31 Golden ratio years
25 October 2019 18,359 16 Pi years
15 February 2020 18,472 210 Mercury years
2 May 2020 18,549 27 Mars years
15 June 2020 18,593 36 Root-2 years
20 July 2020 18,628 51 Earth years
19 November 2020 18,750 27,000,000 minutes
11 March 2021 18,862 19 e years
29 April 2021 18,911 32 Golden ratio years
20 July 2021 18,993 52 Earth years
27 July 2021 19,000 19,000 days
13 November 2021 19,109 37 Root-2 years
14 November 2021 19,110 700 lunar orbits
24 November 2021 19,120 4 Californium 250 half-lives
4 January 2022 19,161 3,000 Pluto days
20 March 2022 19,236 28 Mars years
3 April 2022 19,250 10 Cobalt 60 half-lives
13 July 2022 19,351 220 Mercury years
20 July 2022 19,358 53 Earth years
14 October 2022 19,444 28,000,000 minutes
11 December 2022 19,502 33 Golden ratio years
15 December 2022 19,506 17 Pi years
14 April 2023 19,626 38 Root-2 years
20 July 2023 19,723 54 Earth years
29 November 2023 19,855 20 e years
5 February 2024 19,923 29 Mars years
22 April 2024 20,000 20,000 days
20 July 2024 20,089 55 Earth years
24 July 2024 20,093 34 Golden ratio years
8 September 2024 20,139 29,000,000 minutes
11 September 2024 20,142 39 Root-2 years
1 December 2024 20,223 90 Venus years
9 December 2024 20,231 230 Mercury years
20 July 2025 20,454 56 Earth years
2 December 2025 20,589 50 Full moon cycles
23 December 2025 20,610 30 Mars years
5 February 2026 20,654 18 Pi years
10 February 2026 20,659 40 Root-2 years
7 March 2026 20,684 35 Golden ratio years
28 June 2026 20,797 60 Draconic years
20 July 2026 20,819 57 Earth years
3 August 2026 20,833 30,000,000 minutes
3 August 2026 20,833 500,000 hours
18 August 2026 20,848 21 e years
17 January 2027 21,000 21,000 days
7 May 2027 21,110 240 Mercury years
11 July 2027 21,175 41 Root-2 years
11 July 2027 21,175 11 Cobalt 60 half-lives
20 July 2027 21,184 58 Earth years
19 October 2027 21,275 36 Golden ratio years
9 November 2027 21,296 2 Curium 243 half-lives
10 November 2027 21,297 31 Mars years
28 June 2028 21,528 31,000,000 minutes
20 July 2028 21,550 59 Earth years
11 November 2028 21,664 5 Jupiter years
11 November 2028 21,664 2 Saturn years
8 December 2028 21,691 42 Root-2 years
28 March 2029 21,801 19 Pi years
6 May 2029 21,840 800 lunar orbits
6 May 2029 21,840 22 e years
1 June 2029 21,866 37 Golden ratio years
20 July 2029 21,915 60 Earth years
27 September 2029 21,984 32 Mars years
3 October 2029 21,990 250 Mercury years
13 October 2029 22,000 22,000 days
9 May 2030 22,208 43 Root-2 years
23 May 2030 22,222 22222 days
23 May 2030 22,222 32,000,000 minutes
20 July 2030 22,280 61 Earth years
13 January 2031 22,457 38 Golden ratio years
26 January 2031 22,470 100 Venus years
7 March 2031 22,510 5 Hydrogen 3 (Tritium) half-lives
20 July 2031 22,645 62 Earth years
15 August 2031 22,671 33 Mars years
7 October 2031 22,724 44 Root-2 years
24 January 2032 22,833 23 e years
1 March 2032 22,870 260 Mercury years
17 April 2032 22,917 33,000,000 minutes
19 May 2032 22,949 20 Pi years
9 July 2032 23,000 23,000 days
20 July 2032 23,011 63 Earth years
26 August 2032 23,048 39 Golden ratio years
17 October 2032 23,100 12 Cobalt 60 half-lives
4 December 2032 23,148 2 gigaseconds
20 February 2033 23,226 1 reign of Queen Victoria
2 July 2033 23,358 34 Mars years
20 July 2033 23,376 64 Earth years
12 March 2034 23,611 34,000,000 minutes
9 April 2034 23,639 40 Golden ratio years
20 July 2034 23,741 65 Earth years
28 July 2034 23,749 270 Mercury years
13 October 2034 23,826 24 e years
26 December 2034 23,900 5 Californium 250 half-lives
5 April 2035 24,000 24,000 days
20 May 2035 24,045 35 Mars years
10 July 2035 24,096 21 Pi years
20 July 2035 24,106 66 Earth years
21 November 2035 24,230 41 Golden ratio years
24 December 2035 24,263 70 Draconic years
4 February 2036 24,305 35,000,000 minutes
20 July 2036 24,472 67 Earth years
26 October 2036 24,570 900 lunar orbits
24 December 2036 24,629 280 Mercury years
12 March 2037 24,707 60 Full moon cycles
22 March 2037 24,717 110 Venus years
6 April 2037 24,732 36 Mars years
2 July 2037 24,819 25 e years
4 July 2037 24,821 42 Golden ratio years
20 July 2037 24,837 68 Earth years
30 December 2037 25,000 25,000 days
30 December 2037 25,000 36,000,000 minutes
30 December 2037 25,000 600,000 hours
24 January 2038 25,025 13 Cobalt 60 half-lives
20 July 2038 25,202 69 Earth years
31 August 2038 25,244 22 Pi years
15 February 2039 25,412 43 Golden ratio years
22 February 2039 25,419 37 Mars years
22 May 2039 25,508 290 Mercury years
1 July 2039 25,548 4,000 Pluto days
20 July 2039 25,567 70 Earth years
24 November 2039 25,694 37,000,000 minutes
20 March 2040 25,811 26 e years
20 July 2040 25,933 71 Earth years
21 September 2040 25,996 6 Jupiter years
25 September 2040 26,000 26,000 days
28 September 2040 26,003 44 Golden ratio years
9 January 2041 26,106 38 Mars years
20 July 2041 26,298 72 Earth years
18 October 2041 26,388 300 Mercury years
19 October 2041 26,389 38,000,000 minutes
21 October 2041 26,391 23 Pi years
20 July 2042 26,663 73 Earth years
27 November 2042 26,793 39 Mars years
8 December 2042 26,804 27 e years
3 May 2043 26,950 14 Cobalt 60 half-lives
17 May 2043 26,964 120 Venus years
22 June 2043 27,000 27,000 days
4 July 2043 27,012 6 Hydrogen 3 (Tritium) half-lives
20 July 2043 27,028 74 Earth years
13 September 2043 27,083 39,000,000 minutes
16 March 2044 27,268 310 Mercury years
17 April 2044 27,300 1,000 lunar orbits
20 July 2044 27,394 75 Earth years
14 October 2044 27,480 40 Mars years
11 December 2044 27,538 24 Pi years
3 February 2045 27,592 2 reigns of Henry VIII
21 June 2045 27,730 80 Draconic years
20 July 2045 27,759 76 Earth years
8 August 2045 27,778 40,000,000 minutes
27 August 2045 27,797 28 e years
18 March 2046 28,000 28,000 days
20 July 2046 28,124 77 Earth years
12 August 2046 28,147 320 Mercury years
1 September 2046 28,167 41 Mars years
3 July 2047 28,472 41,000,000 minutes
20 July 2047 28,489 78 Earth years
4 January 2048 28,657 23rd Fibonacci number days
27 January 2048 28,680 6 Californium 250 half-lives
2 February 2048 28,686 25 Pi years
16 May 2048 28,790 29 e years
20 June 2048 28,825 70 Full moon cycles
19 July 2048 28,854 42 Mars years
20 July 2048 28,855 79 Earth years
9 August 2048 28,875 15 Cobalt 60 half-lives
12 December 2048 29,000 29,000 days
8 January 2049 29,027 330 Mercury years
27 May 2049 29,166 42,000,000 minutes
28 May 2049 29,167 700,000 hours
11 July 2049 29,211 130 Venus years
20 July 2049 29,220 80 Earth years
6 June 2050 29,541 43 Mars years
20 July 2050 29,585 81 Earth years
2 February 2051 29,782 30 e years
25 March 2051 29,833 26 Pi years
22 April 2051 29,861 43,000,000 minutes
6 June 2051 29,906 340 Mercury years
20 July 2051 29,950 82 Earth years
8 September 2051 30,000 30,000 days
8 October 2051 30,030 1,100 lunar orbits
23 April 2052 30,228 44 Mars years
12 May 2052 30,247 4321 weeks
20 July 2052 30,316 83 Earth years
2 August 2052 30,329 7 Jupiter years
16 March 2053 30,555 44,000,000 minutes
20 July 2053 30,681 84 Earth years
22 October 2053 30,775 31 e years
2 November 2053 30,786 350 Mercury years
16 November 2053 30,800 16 Cobalt 60 half-lives
11 March 2054 30,915 45 Mars years
16 May 2054 30,981 27 Pi years
4 June 2054 31,000 31,000 days
20 July 2054 31,046 85 Earth years
17 December 2054 31,196 90 Draconic years
9 February 2055 31,250 45,000,000 minutes
20 July 2055 31,411 86 Earth years
5 September 2055 31,458 140 Venus years
31 October 2055 31,514 7 Hydrogen 3 (Tritium) half-lives
27 January 2056 31,602 46 Mars years
31 March 2056 31,666 360 Mercury years
11 July 2056 31,768 32 e years
20 July 2056 31,777 87 Earth years
25 December 2056 31,935 5,000 Pluto days
3 January 2057 31,944 46,000,000 minutes
3 January 2057 31,944 3 Curium 243 half-lives
28 February 2057 32,000 32,000 days
6 July 2057 32,128 28 Pi years
20 July 2057 32,142 88 Earth years
14 December 2057 32,289 47 Mars years
9 July 2058 32,496 3 Saturn years
20 July 2058 32,507 89 Earth years
27 August 2058 32,545 370 Mercury years
29 November 2058 32,639 47,000,000 minutes
23 February 2059 32,725 17 Cobalt 60 half-lives
30 March 2059 32,760 1,200 lunar orbits
31 March 2059 32,761 33 e years
20 July 2059 32,872 90 Earth years
28 September 2059 32,942 80 Full moon cycles
1 November 2059 32,976 48 Mars years
25 November 2059 33,000 33,000 days
20 July 2060 33,238 91 Earth years
27 August 2060 33,276 29 Pi years
23 October 2060 33,333 33333 days
23 October 2060 33,333 48,000,000 minutes
23 October 2060 33,333 800,000 hours
23 January 2061 33,425 380 Mercury years
27 February 2061 33,460 7 Californium 250 half-lives
20 July 2061 33,603 92 Earth years
18 September 2061 33,663 49 Mars years
30 October 2061 33,705 150 Venus years
17 December 2061 33,753 34 e years
20 July 2062 33,968 93 Earth years
21 August 2062 34,000 34,000 days
18 September 2062 34,028 49,000,000 minutes
21 June 2063 34,304 390 Mercury years
20 July 2063 34,333 94 Earth years
6 August 2063 34,350 50 Mars years
18 October 2063 34,423 30 Pi years
1 June 2064 34,650 18 Cobalt 60 half-lives
13 June 2064 34,662 100 Draconic years
13 June 2064 34,662 8 Jupiter years
20 July 2064 34,699 95 Earth years
12 August 2064 34,722 3 gigaseconds
12 August 2064 34,722 50,000,000 minutes
5 September 2064 34,746 35 e years
17 May 2065 35,000 35,000 days
23 June 2065 35,037 51 Mars years
20 July 2065 35,064 96 Earth years
17 November 2065 35,184 400 Mercury years
7 July 2066 35,416 51,000,000 minutes
20 July 2066 35,429 97 Earth years
19 September 2066 35,490 1,300 lunar orbits
8 December 2066 35,570 31 Pi years
11 May 2067 35,724 52 Mars years
26 May 2067 35,739 36 e years
20 July 2067 35,794 98 Earth years
25 December 2067 35,952 160 Venus years
11 February 2068 36,000 36,000 days
27 February 2068 36,016 8 Hydrogen 3 (Tritium) half-lives
15 April 2068 36,064 410 Mercury years
1 June 2068 36,111 52,000,000 minutes
20 July 2068 36,160 99 Earth years
28 March 2069 36,411 53 Mars years
20 July 2069 36,525 100 Earth years
8 September 2069 36,575 19 Cobalt 60 half-lives
29 January 2070 36,718 32 Pi years
12 February 2070 36,732 37 e years
26 April 2070 36,805 53,000,000 minutes
20 July 2070 36,890 101 Earth years
11 September 2070 36,943 420 Mercury years
7 November 2070 37,000 37,000 days
6 January 2071 37,060 90 Full moon cycles
13 February 2071 37,098 54 Mars years
20 July 2071 37,255 102 Earth years
21 March 2072 37,500 54,000,000 minutes
21 March 2072 37,500 900,000 hours
20 July 2072 37,621 103 Earth years
31 October 2072 37,724 38 e years
31 December 2072 37,785 55 Mars years
7 February 2073 37,823 430 Mercury years
21 March 2073 37,865 33 Pi years
20 July 2073 37,986 104 Earth years
3 August 2073 38,000 38,000 days
9 December 2073 38,128 110 Draconic years
13 February 2074 38,194 55,000,000 minutes
18 February 2074 38,199 170 Venus years
11 March 2074 38,220 1,400 lunar orbits
31 March 2074 38,240 8 Californium 250 half-lives
21 June 2074 38,322 6,000 Pluto days
20 July 2074 38,351 105 Earth years
18 November 2074 38,472 56 Mars years
16 December 2074 38,500 20 Cobalt 60 half-lives
6 July 2075 38,702 440 Mercury years
20 July 2075 38,716 106 Earth years
21 July 2075 38,717 39 e years
9 January 2076 38,889 56,000,000 minutes
23 April 2076 38,994 9 Jupiter years
29 April 2076 39,000 39,000 days
12 May 2076 39,013 34 Pi years
20 July 2076 39,082 107 Earth years
5 October 2076 39,159 57 Mars years
20 July 2077 39,447 108 Earth years
2 December 2077 39,582 450 Mercury years
3 December 2077 39,583 57,000,000 minutes
9 April 2078 39,710 40 e years
20 July 2078 39,812 109 Earth years
23 August 2078 39,846 58 Mars years
24 January 2079 40,000 40,000 days
3 July 2079 40,160 35 Pi years
20 July 2079 40,177 110 Earth years
29 October 2079 40,278 58,000,000 minutes
24 March 2080 40,425 21 Cobalt 60 half-lives
14 April 2080 40,446 180 Venus years
30 April 2080 40,462 460 Mercury years
25 June 2080 40,518 9 Hydrogen 3 (Tritium) half-lives
10 July 2080 40,533 59 Mars years
20 July 2080 40,543 111 Earth years
27 December 2080 40,703 41 e years
20 July 2081 40,908 112 Earth years
31 August 2081 40,950 1,500 lunar orbits
22 September 2081 40,972 59,000,000 minutes
20 October 2081 41,000 41,000 days
16 April 2082 41,178 100 Full moon cycles
28 May 2082 41,220 60 Mars years
20 July 2082 41,273 113 Earth years
24 August 2082 41,308 36 Pi years
26 September 2082 41,341 470 Mercury years
12 November 2082 41,388 3 reigns of Henry VIII
6 June 2083 41,594 120 Draconic years
20 July 2083 41,638 114 Earth years
17 August 2083 41,666 60,000,000 minutes
18 August 2083 41,667 1,000,000 hours
15 September 2083 41,695 42 e years
14 April 2084 41,907 61 Mars years
16 July 2084 42,000 42,000 days
20 July 2084 42,004 115 Earth years
22 February 2085 42,221 480 Mercury years
1 July 2085 42,350 22 Cobalt 60 half-lives
12 July 2085 42,361 61,000,000 minutes
20 July 2085 42,369 116 Earth years
14 October 2085 42,455 37 Pi years
28 February 2086 42,592 4 Curium 243 half-lives
2 March 2086 42,594 62 Mars years
4 June 2086 42,688 43 e years
9 June 2086 42,693 190 Venus years
20 July 2086 42,734 117 Earth years
12 April 2087 43,000 43,000 days
2 May 2087 43,020 9 Californium 250 half-lives
6 June 2087 43,055 62,000,000 minutes
20 July 2087 43,099 118 Earth years
21 July 2087 43,100 490 Mercury years
18 January 2088 43,281 63 Mars years
4 March 2088 43,327 10 Jupiter years
5 March 2088 43,328 4 Saturn years
20 July 2088 43,465 119 Earth years
4 December 2088 43,602 38 Pi years
20 February 2089 43,680 1,600 lunar orbits
21 February 2089 43,681 44 e years
1 May 2089 43,750 63,000,000 minutes
20 July 2089 43,830 120 Earth years
5 December 2089 43,968 64 Mars years
17 December 2089 43,980 500 Mercury years
6 January 2090 44,000 44,000 days
20 July 2090 44,195 121 Earth years
8 October 2090 44,275 23 Cobalt 60 half-lives
26 March 2091 44,444 44444 days
26 March 2091 44,444 64,000,000 minutes
20 July 2091 44,560 122 Earth years
23 October 2091 44,655 65 Mars years
16 December 2091 44,709 7,000 Pluto days
26 January 2092 44,750 39 Pi years
15 May 2092 44,860 510 Mercury years
20 July 2092 44,926 123 Earth years
3 August 2092 44,940 200 Venus years
2 October 2092 45,000 45,000 days
22 October 2092 45,020 10 Hydrogen 3 (Tritium) half-lives
2 December 2092 45,061 130 Draconic years
18 February 2093 45,139 65,000,000 minutes
20 July 2093 45,291 124 Earth years
25 July 2093 45,296 110 Full moon cycles
9 September 2093 45,342 66 Mars years
20 July 2094 45,656 125 Earth years
11 October 2094 45,739 520 Mercury years
13 January 2095 45,833 66,000,000 minutes
13 January 2095 45,833 1,100,000 hours
18 March 2095 45,897 40 Pi years
29 June 2095 46,000 46,000 days
20 July 2095 46,021 126 Earth years
28 July 2095 46,029 67 Mars years
15 January 2096 46,200 24 Cobalt 60 half-lives
20 April 2096 46,296 4 gigaseconds
1 July 2096 46,368 24th Fibonacci number days
20 July 2096 46,387 127 Earth years
12 August 2096 46,410 1,700 lunar orbits
23 September 2096 46,452 2 reigns of Queen Victoria
7 December 2096 46,527 67,000,000 minutes
9 March 2097 46,619 530 Mercury years
14 June 2097 46,716 68 Mars years
20 July 2097 46,752 128 Earth years
25 March 2098 47,000 47,000 days
9 May 2098 47,045 41 Pi years
20 July 2098 47,117 129 Earth years
28 September 2098 47,187 210 Venus years
2 November 2098 47,222 68,000,000 minutes
2 May 2099 47,403 69 Mars years
20 July 2099 47,482 130 Earth years
5 August 2099 47,498 540 Mercury years
14 January 2100 47,660 11 Jupiter years
3 June 2100 47,800 10 Californium 250 half-lives
20 July 2100 47,847 131 Earth years
27 September 2100 47,916 69,000,000 minutes
20 December 2100 48,000 48,000 days
20 March 2101 48,090 70 Mars years
24 April 2101 48,125 25 Cobalt 60 half-lives
30 June 2101 48,192 42 Pi years
20 July 2101 48,212 132 Earth years
2 January 2102 48,378 550 Mercury years
31 May 2102 48,527 140 Draconic years
20 July 2102 48,577 133 Earth years
23 August 2102 48,611 70,000,000 minutes
5 February 2103 48,777 71 Mars years
20 July 2103 48,942 134 Earth years
16 September 2103 49,000 49,000 days
3 February 2104 49,140 1,800 lunar orbits
31 May 2104 49,258 560 Mercury years
17 July 2104 49,305 71,000,000 minutes
20 July 2104 49,308 135 Earth years
21 August 2104 49,340 43 Pi years
3 November 2104 49,414 120 Full moon cycles
23 November 2104 49,434 220 Venus years
23 December 2104 49,464 72 Mars years
19 February 2105 49,522 11 Hydrogen 3 (Tritium) half-lives
20 July 2105 49,673 136 Earth years
12 June 2106 50,000 50,000 days
12 June 2106 50,000 72,000,000 minutes
12 June 2106 50,000 1,200,000 hours
End of time ∞ Infinity-versary

Hide Planets   |   Hide Constants   |   Hide Half-Lives

DateDaysEvent
21 July 1969 1 One day
26 July 1969 6 1st even-perfect-number days
27 July 1969 7 One week
16 August 1969 27 1 lunar orbit
17 August 1969 28 2nd even-perfect-number days
20 August 1969 31 One month
31 August 1969 42 Life-universe-and-everything
13 September 1969 55 10th Fibonacci number days
27 September 1969 69 Naughty-versary
28 September 1969 70 Smallest-weird-number days
17 October 1969 89 11th Fibonacci number days
28 October 1969 100 100 days
20 November 1969 123 123 days
11 December 1969 144 12th Fibonacci number days
5 February 1970 200 200 days
10 March 1970 233 13th Fibonacci number days
19 April 1970 273 10 lunar orbits
16 May 1970 300 300 days
16 May 1970 300 Sparta!
6 June 1970 321 321 days
20 July 1970 365 1 Earth year
1 August 1970 377 14th Fibonacci number days
24 August 1970 400 400 days
28 August 1970 404 Anniversary Not Found
28 November 1970 496 3rd even-perfect-number days
2 December 1970 500 500 days
5 December 1970 503 Anniversary Forbidden
18 December 1970 516 1 Root-2 years
3 March 1971 591 1 Golden ratio years
12 March 1971 600 600 days
22 March 1971 610 15th Fibonacci number days
17 May 1971 666 Lucifersary
7 June 1971 687 1 Mars year
14 June 1971 694 1,000,000 minutes
20 June 1971 700 700 days
20 July 1971 730 2 Earth years
21 August 1971 762 Feynman-point days
28 September 1971 800 800 days
28 November 1971 861 123 weeks
17 December 1971 880 10 Mercury years
6 January 1972 900 900 days
2 April 1972 987 16th Fibonacci number days
8 April 1972 993 1 e years
15 April 1972 1,000 1,000 days
18 May 1972 1,033 2 Root-2 years
20 July 1972 1,096 3 Earth years
4 August 1972 1,111 1111 days
9 September 1972 1,147 1 Pi years
14 October 1972 1,182 2 Golden ratio years
12 November 1972 1,211 4th look-and-say number days
5 December 1972 1,234 1234 days
18 March 1973 1,337 1337 days
15 April 1973 1,365 50 lunar orbits
24 April 1973 1,374 2 Mars years
9 May 1973 1,389 2,000,000 minutes
20 July 1973 1,461 4 Earth years
16 October 1973 1,549 3 Root-2 years
3 December 1973 1,597 17th Fibonacci number days
14 April 1974 1,729 Hardy-Ramanujan-number days
14 May 1974 1,759 20 Mercury years
28 May 1974 1,773 3 Golden ratio years
20 July 1974 1,826 5 Earth years
27 October 1974 1,925 1 Cobalt 60 half-lives
26 December 1974 1,985 2 e years
28 December 1974 1,987 300th prime number (1987) days
10 January 1975 2,000 2,000 days
12 March 1975 2,061 3 Mars years
17 March 1975 2,066 4 Root-2 years
3 April 1975 2,083 3,000,000 minutes
20 July 1975 2,191 6 Earth years
20 August 1975 2,222 2222 days
14 September 1975 2,247 321 weeks
14 September 1975 2,247 10 Venus years
1 November 1975 2,295 2 Pi years
17 November 1975 2,311 5th Euclid-prime days
9 January 1976 2,364 4 Golden ratio years
20 July 1976 2,557 7 Earth years
14 August 1976 2,582 5 Root-2 years
16 August 1976 2,584 18th Fibonacci number days
10 October 1976 2,639 30 Mercury years
9 January 1977 2,730 100 lunar orbits
27 January 1977 2,748 4 Mars years
26 February 1977 2,778 4,000,000 minutes
20 July 1977 2,922 8 Earth years
22 August 1977 2,955 5 Golden ratio years
14 September 1977 2,978 3 e years
6 October 1977 3,000 3,000 days
13 January 1978 3,099 6 Root-2 years
17 April 1978 3,193 500 Pluto days
20 July 1978 3,287 9 Earth years
4 September 1978 3,333 3333 days
15 December 1978 3,435 5 Mars years
22 December 1978 3,442 3 Pi years
15 January 1979 3,466 10 Draconic years
21 January 1979 3,472 5,000,000 minutes
8 March 1979 3,518 40 Mercury years
5 April 1979 3,546 6 Golden ratio years
13 June 1979 3,615 7 Root-2 years
20 July 1979 3,652 10 Earth years
3 February 1980 3,850 2 Cobalt 60 half-lives
3 June 1980 3,971 4 e years
2 July 1980 4,000 4,000 days
20 July 1980 4,018 11 Earth years
14 October 1980 4,104 Second-positive-integer-which-can-be-expressed-as-the-sum-of-two-positive-cubes-in-two-different-ways days
28 October 1980 4,118 10 Full moon cycles
1 November 1980 4,122 6 Mars years
11 November 1980 4,132 8 Root-2 years
16 November 1980 4,137 7 Golden ratio years
16 December 1980 4,167 6,000,000 minutes
16 December 1980 4,167 100,000 hours
30 December 1980 4,181 19th Fibonacci number days
19 May 1981 4,321 4321 days
31 May 1981 4,333 1 Jupiter year
20 July 1981 4,383 12 Earth years
4 August 1981 4,398 50 Mercury years
19 September 1981 4,444 4444 days
8 November 1981 4,494 20 Venus years
16 November 1981 4,502 1 Hydrogen 3 (Tritium) half-lives
12 February 1982 4,590 4 Pi years
11 April 1982 4,648 9 Root-2 years
30 June 1982 4,728 8 Golden ratio years
20 July 1982 4,748 13 Earth years
21 August 1982 4,780 1 Californium 250 half-lives
19 September 1982 4,809 7 Mars years
10 November 1982 4,861 7,000,000 minutes
21 February 1983 4,964 5 e years
29 March 1983 5,000 5,000 days
8 May 1983 5,040 8th colossally-abundant-number days
20 July 1983 5,113 14 Earth years
10 September 1983 5,165 10 Root-2 years
1 January 1984 5,278 60 Mercury years
11 February 1984 5,319 9 Golden ratio years
1 July 1984 5,460 200 lunar orbits
20 July 1984 5,479 15 Earth years
6 August 1984 5,496 8 Mars years
4 October 1984 5,555 5555 days
5 October 1984 5,556 8,000,000 minutes
7 February 1985 5,681 11 Root-2 years
4 April 1985 5,737 5 Pi years
12 May 1985 5,775 3 Cobalt 60 half-lives
20 July 1985 5,844 16 Earth years
24 September 1985 5,910 10 Golden ratio years
9 November 1985 5,956 6 e years
23 December 1985 6,000 6,000 days
29 May 1986 6,157 70 Mercury years
15 June 1986 6,174 Kaprekar's-constant days
24 June 1986 6,183 9 Mars years
9 July 1986 6,198 12 Root-2 years
20 July 1986 6,209 17 Earth years
30 August 1986 6,250 9,000,000 minutes
14 January 1987 6,387 1,000 Pluto days
8 May 1987 6,501 11 Golden ratio years
20 July 1987 6,574 18 Earth years
20 October 1987 6,666 6666 days
7 December 1987 6,714 13 Root-2 years
3 January 1988 6,741 30 Venus years
27 January 1988 6,765 20th Fibonacci number days
11 May 1988 6,870 10 Mars years
26 May 1988 6,885 6 Pi years
12 July 1988 6,932 20 Draconic years
20 July 1988 6,940 19 Earth years
24 July 1988 6,944 10,000,000 minutes
29 July 1988 6,949 7 e years
18 September 1988 7,000 7,000 days
25 October 1988 7,037 80 Mercury years
19 December 1988 7,092 12 Golden ratio years
6 May 1989 7,230 14 Root-2 years
20 July 1989 7,305 20 Earth years
29 March 1990 7,557 11 Mars years
19 June 1990 7,639 11,000,000 minutes
20 July 1990 7,670 21 Earth years
2 August 1990 7,683 13 Golden ratio years
19 August 1990 7,700 4 Cobalt 60 half-lives
5 October 1990 7,747 15 Root-2 years
4 November 1990 7,777 7777 days
23 March 1991 7,916 90 Mercury years
18 April 1991 7,942 8 e years
15 June 1991 8,000 8,000 days
17 July 1991 8,032 7 Pi years
20 July 1991 8,035 22 Earth years
21 October 1991 8,128 4th even-perfect-number days
22 December 1991 8,190 300 lunar orbits
6 February 1992 8,236 20 Full moon cycles
14 February 1992 8,244 12 Mars years
4 March 1992 8,263 16 Root-2 years
15 March 1992 8,274 14 Golden ratio years
13 May 1992 8,333 12,000,000 minutes
13 May 1992 8,333 200,000 hours
20 July 1992 8,401 23 Earth years
14 March 1993 8,638 1234 weeks
10 April 1993 8,665 2 Jupiter years
20 July 1993 8,766 24 Earth years
3 August 1993 8,780 17 Root-2 years
19 August 1993 8,796 100 Mercury years
27 October 1993 8,865 15 Golden ratio years
19 November 1993 8,888 8888 days
1 January 1994 8,931 13 Mars years
5 January 1994 8,935 9 e years
27 February 1994 8,988 40 Venus years
11 March 1994 9,000 9,000 days
15 March 1994 9,004 2 Hydrogen 3 (Tritium) half-lives
8 April 1994 9,028 13,000,000 minutes
20 July 1994 9,131 25 Earth years
6 September 1994 9,179 8 Pi years
1 January 1995 9,296 18 Root-2 years
10 June 1995 9,456 16 Golden ratio years
20 July 1995 9,496 26 Earth years
22 September 1995 9,560 2 Californium 250 half-lives
19 November 1995 9,618 14 Mars years
26 November 1995 9,625 5 Cobalt 60 half-lives
16 January 1996 9,676 110 Mercury years
2 March 1996 9,722 14,000,000 minutes
1 June 1996 9,813 19 Root-2 years
20 July 1996 9,862 27 Earth years
23 September 1996 9,927 10 e years
4 December 1996 9,999 9999 days
5 December 1996 10,000 10,000 days
21 January 1997 10,047 17 Golden ratio years
20 July 1997 10,227 28 Earth years
6 October 1997 10,305 15 Mars years
28 October 1997 10,327 9 Pi years
30 October 1997 10,329 20 Root-2 years
8 January 1998 10,399 30 Draconic years
26 January 1998 10,417 15,000,000 minutes
13 June 1998 10,555 120 Mercury years
20 July 1998 10,592 29 Earth years
4 September 1998 10,638 18 Golden ratio years
14 September 1998 10,648 1 Curium 243 half-lives
17 March 1999 10,832 1 Saturn year
31 March 1999 10,846 21 Root-2 years
13 June 1999 10,920 400 lunar orbits
13 June 1999 10,920 11 e years
9 July 1999 10,946 21st Fibonacci number days
20 July 1999 10,957 30 Earth years
24 August 1999 10,992 16 Mars years
1 September 1999 11,000 11,000 days
21 December 1999 11,111 11111 days
21 December 1999 11,111 16,000,000 minutes
17 April 2000 11,229 19 Golden ratio years
23 April 2000 11,235 50 Venus years
20 July 2000 11,323 31 Earth years
28 August 2000 11,362 22 Root-2 years
9 November 2000 11,435 130 Mercury years
18 December 2000 11,474 10 Pi years
4 March 2001 11,550 6 Cobalt 60 half-lives
28 March 2001 11,574 1 gigasecond
11 July 2001 11,679 17 Mars years
20 July 2001 11,688 32 Earth years
14 November 2001 11,805 17,000,000 minutes
28 November 2001 11,819 20 Golden ratio years
27 January 2002 11,879 23 Root-2 years
2 March 2002 11,913 12 e years
28 May 2002 12,000 12,000 days
20 July 2002 12,053 33 Earth years
7 April 2003 12,314 140 Mercury years
8 May 2003 12,345 12345 days
16 May 2003 12,353 30 Full moon cycles
29 May 2003 12,366 18 Mars years
27 June 2003 12,395 24 Root-2 years
12 July 2003 12,410 21 Golden ratio years
20 July 2003 12,418 34 Earth years
10 October 2003 12,500 18,000,000 minutes
10 October 2003 12,500 300,000 hours
9 February 2004 12,622 11 Pi years
10 July 2004 12,774 2,000 Pluto days
20 July 2004 12,784 35 Earth years
19 November 2004 12,906 13 e years
25 November 2004 12,912 25 Root-2 years
19 February 2005 12,998 3 Jupiter years
21 February 2005 13,000 13,000 days
22 February 2005 13,001 22 Golden ratio years
15 April 2005 13,053 19 Mars years
20 July 2005 13,149 36 Earth years
3 September 2005 13,194 19,000,000 minutes
3 September 2005 13,194 150 Mercury years
25 April 2006 13,428 26 Root-2 years
11 June 2006 13,475 7 Cobalt 60 half-lives
18 June 2006 13,482 60 Venus years
12 July 2006 13,506 3 Hydrogen 3 (Tritium) half-lives
20 July 2006 13,514 37 Earth years
6 October 2006 13,592 23 Golden ratio years
3 December 2006 13,650 500 lunar orbits
3 March 2007 13,740 20 Mars years
1 April 2007 13,769 12 Pi years
28 April 2007 13,796 1 reign of Henry VIII
6 July 2007 13,865 40 Draconic years
20 July 2007 13,879 38 Earth years
30 July 2007 13,889 20,000,000 minutes
8 August 2007 13,898 14 e years
24 September 2007 13,945 27 Root-2 years
18 November 2007 14,000 14,000 days
31 January 2008 14,074 160 Mercury years
19 May 2008 14,183 24 Golden ratio years
20 July 2008 14,245 39 Earth years
23 October 2008 14,340 3 Californium 250 half-lives
18 January 2009 14,427 21 Mars years
21 February 2009 14,461 28 Root-2 years
23 June 2009 14,583 21,000,000 minutes
20 July 2009 14,610 40 Earth years
31 December 2009 14,774 25 Golden ratio years
27 April 2010 14,891 15 e years
23 May 2010 14,917 13 Pi years
28 June 2010 14,953 170 Mercury years
20 July 2010 14,975 41 Earth years
22 July 2010 14,977 29 Root-2 years
14 August 2010 15,000 15,000 days
6 December 2010 15,114 22 Mars years
19 May 2011 15,278 22,000,000 minutes
20 July 2011 15,340 42 Earth years
14 August 2011 15,365 26 Golden ratio years
18 September 2011 15,400 8 Cobalt 60 half-lives
21 December 2011 15,494 30 Root-2 years
20 July 2012 15,706 43 Earth years
12 August 2012 15,729 70 Venus years
23 October 2012 15,801 23 Mars years
24 November 2012 15,833 180 Mercury years
14 January 2013 15,884 16 e years
27 March 2013 15,956 27 Golden ratio years
12 April 2013 15,972 23,000,000 minutes
10 May 2013 16,000 16,000 days
20 May 2013 16,010 31 Root-2 years
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