Mathaversaries

14th July, 1974

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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
14 July 2013 14,245 39 Earth years
17 October 2013 14,340 3 Californium 250 half-lives
12 January 2014 14,427 21 Mars years
15 February 2014 14,461 28 Root-2 years
17 June 2014 14,583 21,000,000 minutes
14 July 2014 14,610 40 Earth years
25 December 2014 14,774 25 Golden ratio years
21 April 2015 14,891 15 e years
17 May 2015 14,917 13 Pi years
22 June 2015 14,953 170 Mercury years
14 July 2015 14,975 41 Earth years
16 July 2015 14,977 29 Root-2 years
8 August 2015 15,000 15,000 days
30 November 2015 15,114 22 Mars years
12 May 2016 15,278 22,000,000 minutes
14 July 2016 15,341 42 Earth years
7 August 2016 15,365 26 Golden ratio years
11 September 2016 15,400 8 Cobalt 60 half-lives
14 December 2016 15,494 30 Root-2 years
14 July 2017 15,706 43 Earth years
6 August 2017 15,729 70 Venus years
17 October 2017 15,801 23 Mars years
18 November 2017 15,833 180 Mercury years
8 January 2018 15,884 16 e years
21 March 2018 15,956 27 Golden ratio years
6 April 2018 15,972 23,000,000 minutes
4 May 2018 16,000 16,000 days
14 May 2018 16,010 31 Root-2 years
7 July 2018 16,064 14 Pi years
14 July 2018 16,071 44 Earth years
19 May 2019 16,380 600 lunar orbits
14 July 2019 16,436 45 Earth years
18 August 2019 16,471 40 Full moon cycles
4 September 2019 16,488 24 Mars years
13 October 2019 16,527 32 Root-2 years
2 November 2019 16,547 28 Golden ratio years
1 March 2020 16,667 24,000,000 minutes
1 March 2020 16,667 400,000 hours
15 April 2020 16,712 190 Mercury years
14 July 2020 16,802 46 Earth years
27 September 2020 16,877 17 e years
28 January 2021 17,000 17,000 days
12 March 2021 17,043 33 Root-2 years
15 June 2021 17,138 29 Golden ratio years
14 July 2021 17,167 47 Earth years
22 July 2021 17,175 25 Mars years
27 August 2021 17,211 15 Pi years
19 December 2021 17,325 9 Cobalt 60 half-lives
25 December 2021 17,331 50 Draconic years
25 December 2021 17,331 4 Jupiter years
24 January 2022 17,361 25,000,000 minutes
14 July 2022 17,532 48 Earth years
11 August 2022 17,560 34 Root-2 years
12 September 2022 17,592 200 Mercury years
9 January 2023 17,711 22nd Fibonacci number days
27 January 2023 17,729 30 Golden ratio years
9 June 2023 17,862 26 Mars years
16 June 2023 17,869 18 e years
14 July 2023 17,897 49 Earth years
1 October 2023 17,976 80 Venus years
25 October 2023 18,000 18,000 days
2 November 2023 18,008 4 Hydrogen 3 (Tritium) half-lives
19 December 2023 18,055 26,000,000 minutes
9 January 2024 18,076 35 Root-2 years
14 July 2024 18,263 50 Earth years
9 September 2024 18,320 31 Golden ratio years
18 October 2024 18,359 16 Pi years
8 February 2025 18,472 210 Mercury years
26 April 2025 18,549 27 Mars years
9 June 2025 18,593 36 Root-2 years
14 July 2025 18,628 51 Earth years
13 November 2025 18,750 27,000,000 minutes
5 March 2026 18,862 19 e years
23 April 2026 18,911 32 Golden ratio years
14 July 2026 18,993 52 Earth years
21 July 2026 19,000 19,000 days
7 November 2026 19,109 37 Root-2 years
8 November 2026 19,110 700 lunar orbits
18 November 2026 19,120 4 Californium 250 half-lives
29 December 2026 19,161 3,000 Pluto days
14 March 2027 19,236 28 Mars years
28 March 2027 19,250 10 Cobalt 60 half-lives
7 July 2027 19,351 220 Mercury years
14 July 2027 19,358 53 Earth years
8 October 2027 19,444 28,000,000 minutes
5 December 2027 19,502 33 Golden ratio years
9 December 2027 19,506 17 Pi years
7 April 2028 19,626 38 Root-2 years
14 July 2028 19,724 54 Earth years
22 November 2028 19,855 20 e years
29 January 2029 19,923 29 Mars years
16 April 2029 20,000 20,000 days
14 July 2029 20,089 55 Earth years
18 July 2029 20,093 34 Golden ratio years
2 September 2029 20,139 29,000,000 minutes
5 September 2029 20,142 39 Root-2 years
25 November 2029 20,223 90 Venus years
3 December 2029 20,231 230 Mercury years
14 July 2030 20,454 56 Earth years
26 November 2030 20,589 50 Full moon cycles
17 December 2030 20,610 30 Mars years
30 January 2031 20,654 18 Pi years
4 February 2031 20,659 40 Root-2 years
1 March 2031 20,684 35 Golden ratio years
22 June 2031 20,797 60 Draconic years
14 July 2031 20,819 57 Earth years
28 July 2031 20,833 30,000,000 minutes
28 July 2031 20,833 500,000 hours
12 August 2031 20,848 21 e years
11 January 2032 21,000 21,000 days
30 April 2032 21,110 240 Mercury years
4 July 2032 21,175 41 Root-2 years
4 July 2032 21,175 11 Cobalt 60 half-lives
14 July 2032 21,185 58 Earth years
12 October 2032 21,275 36 Golden ratio years
2 November 2032 21,296 2 Curium 243 half-lives
3 November 2032 21,297 31 Mars years
22 June 2033 21,528 31,000,000 minutes
14 July 2033 21,550 59 Earth years
5 November 2033 21,664 5 Jupiter years
5 November 2033 21,664 2 Saturn years
2 December 2033 21,691 42 Root-2 years
22 March 2034 21,801 19 Pi years
30 April 2034 21,840 800 lunar orbits
30 April 2034 21,840 22 e years
26 May 2034 21,866 37 Golden ratio years
14 July 2034 21,915 60 Earth years
21 September 2034 21,984 32 Mars years
27 September 2034 21,990 250 Mercury years
7 October 2034 22,000 22,000 days
3 May 2035 22,208 43 Root-2 years
17 May 2035 22,222 22222 days
17 May 2035 22,222 32,000,000 minutes
14 July 2035 22,280 61 Earth years
7 January 2036 22,457 38 Golden ratio years
20 January 2036 22,470 100 Venus years
29 February 2036 22,510 5 Hydrogen 3 (Tritium) half-lives
14 July 2036 22,646 62 Earth years
8 August 2036 22,671 33 Mars years
30 September 2036 22,724 44 Root-2 years
17 January 2037 22,833 23 e years
23 February 2037 22,870 260 Mercury years
11 April 2037 22,917 33,000,000 minutes
13 May 2037 22,949 20 Pi years
3 July 2037 23,000 23,000 days
14 July 2037 23,011 63 Earth years
20 August 2037 23,048 39 Golden ratio years
11 October 2037 23,100 12 Cobalt 60 half-lives
28 November 2037 23,148 2 gigaseconds
14 February 2038 23,226 1 reign of Queen Victoria
26 June 2038 23,358 34 Mars years
14 July 2038 23,376 64 Earth years
6 March 2039 23,611 34,000,000 minutes
3 April 2039 23,639 40 Golden ratio years
14 July 2039 23,741 65 Earth years
22 July 2039 23,749 270 Mercury years
7 October 2039 23,826 24 e years
20 December 2039 23,900 5 Californium 250 half-lives
29 March 2040 24,000 24,000 days
13 May 2040 24,045 35 Mars years
3 July 2040 24,096 21 Pi years
14 July 2040 24,107 66 Earth years
14 November 2040 24,230 41 Golden ratio years
17 December 2040 24,263 70 Draconic years
28 January 2041 24,305 35,000,000 minutes
14 July 2041 24,472 67 Earth years
20 October 2041 24,570 900 lunar orbits
18 December 2041 24,629 280 Mercury years
6 March 2042 24,707 60 Full moon cycles
16 March 2042 24,717 110 Venus years
31 March 2042 24,732 36 Mars years
26 June 2042 24,819 25 e years
28 June 2042 24,821 42 Golden ratio years
14 July 2042 24,837 68 Earth years
24 December 2042 25,000 25,000 days
24 December 2042 25,000 36,000,000 minutes
24 December 2042 25,000 600,000 hours
18 January 2043 25,025 13 Cobalt 60 half-lives
14 July 2043 25,202 69 Earth years
25 August 2043 25,244 22 Pi years
9 February 2044 25,412 43 Golden ratio years
16 February 2044 25,419 37 Mars years
15 May 2044 25,508 290 Mercury years
24 June 2044 25,548 4,000 Pluto days
14 July 2044 25,568 70 Earth years
17 November 2044 25,694 37,000,000 minutes
14 March 2045 25,811 26 e years
14 July 2045 25,933 71 Earth years
15 September 2045 25,996 6 Jupiter years
19 September 2045 26,000 26,000 days
22 September 2045 26,003 44 Golden ratio years
3 January 2046 26,106 38 Mars years
14 July 2046 26,298 72 Earth years
12 October 2046 26,388 300 Mercury years
13 October 2046 26,389 38,000,000 minutes
15 October 2046 26,391 23 Pi years
14 July 2047 26,663 73 Earth years
21 November 2047 26,793 39 Mars years
2 December 2047 26,804 27 e years
26 April 2048 26,950 14 Cobalt 60 half-lives
10 May 2048 26,964 120 Venus years
15 June 2048 27,000 27,000 days
27 June 2048 27,012 6 Hydrogen 3 (Tritium) half-lives
14 July 2048 27,029 74 Earth years
6 September 2048 27,083 39,000,000 minutes
10 March 2049 27,268 310 Mercury years
11 April 2049 27,300 1,000 lunar orbits
14 July 2049 27,394 75 Earth years
8 October 2049 27,480 40 Mars years
5 December 2049 27,538 24 Pi years
28 January 2050 27,592 2 reigns of Henry VIII
15 June 2050 27,730 80 Draconic years
14 July 2050 27,759 76 Earth years
2 August 2050 27,778 40,000,000 minutes
21 August 2050 27,797 28 e years
12 March 2051 28,000 28,000 days
14 July 2051 28,124 77 Earth years
6 August 2051 28,147 320 Mercury years
26 August 2051 28,167 41 Mars years
26 June 2052 28,472 41,000,000 minutes
14 July 2052 28,490 78 Earth years
28 December 2052 28,657 23rd Fibonacci number days
20 January 2053 28,680 6 Californium 250 half-lives
26 January 2053 28,686 25 Pi years
10 May 2053 28,790 29 e years
14 June 2053 28,825 70 Full moon cycles
13 July 2053 28,854 42 Mars years
14 July 2053 28,855 79 Earth years
3 August 2053 28,875 15 Cobalt 60 half-lives
6 December 2053 29,000 29,000 days
2 January 2054 29,027 330 Mercury years
21 May 2054 29,166 42,000,000 minutes
22 May 2054 29,167 700,000 hours
5 July 2054 29,211 130 Venus years
14 July 2054 29,220 80 Earth years
31 May 2055 29,541 43 Mars years
14 July 2055 29,585 81 Earth years
27 January 2056 29,782 30 e years
18 March 2056 29,833 26 Pi years
15 April 2056 29,861 43,000,000 minutes
30 May 2056 29,906 340 Mercury years
14 July 2056 29,951 82 Earth years
1 September 2056 30,000 30,000 days
1 October 2056 30,030 1,100 lunar orbits
17 April 2057 30,228 44 Mars years
6 May 2057 30,247 4321 weeks
14 July 2057 30,316 83 Earth years
27 July 2057 30,329 7 Jupiter years
10 March 2058 30,555 44,000,000 minutes
14 July 2058 30,681 84 Earth years
16 October 2058 30,775 31 e years
27 October 2058 30,786 350 Mercury years
10 November 2058 30,800 16 Cobalt 60 half-lives
5 March 2059 30,915 45 Mars years
10 May 2059 30,981 27 Pi years
29 May 2059 31,000 31,000 days
14 July 2059 31,046 85 Earth years
11 December 2059 31,196 90 Draconic years
3 February 2060 31,250 45,000,000 minutes
14 July 2060 31,412 86 Earth years
29 August 2060 31,458 140 Venus years
24 October 2060 31,514 7 Hydrogen 3 (Tritium) half-lives
20 January 2061 31,602 46 Mars years
25 March 2061 31,666 360 Mercury years
5 July 2061 31,768 32 e years
14 July 2061 31,777 87 Earth years
19 December 2061 31,935 5,000 Pluto days
28 December 2061 31,944 46,000,000 minutes
28 December 2061 31,944 3 Curium 243 half-lives
22 February 2062 32,000 32,000 days
30 June 2062 32,128 28 Pi years
14 July 2062 32,142 88 Earth years
8 December 2062 32,289 47 Mars years
3 July 2063 32,496 3 Saturn years
14 July 2063 32,507 89 Earth years
21 August 2063 32,545 370 Mercury years
23 November 2063 32,639 47,000,000 minutes
17 February 2064 32,725 17 Cobalt 60 half-lives
23 March 2064 32,760 1,200 lunar orbits
24 March 2064 32,761 33 e years
14 July 2064 32,873 90 Earth years
21 September 2064 32,942 80 Full moon cycles
25 October 2064 32,976 48 Mars years
18 November 2064 33,000 33,000 days
14 July 2065 33,238 91 Earth years
21 August 2065 33,276 29 Pi years
17 October 2065 33,333 33333 days
17 October 2065 33,333 48,000,000 minutes
17 October 2065 33,333 800,000 hours
17 January 2066 33,425 380 Mercury years
21 February 2066 33,460 7 Californium 250 half-lives
14 July 2066 33,603 92 Earth years
12 September 2066 33,663 49 Mars years
24 October 2066 33,705 150 Venus years
11 December 2066 33,753 34 e years
14 July 2067 33,968 93 Earth years
15 August 2067 34,000 34,000 days
12 September 2067 34,028 49,000,000 minutes
14 June 2068 34,304 390 Mercury years
14 July 2068 34,334 94 Earth years
30 July 2068 34,350 50 Mars years
11 October 2068 34,423 30 Pi years
26 May 2069 34,650 18 Cobalt 60 half-lives
7 June 2069 34,662 100 Draconic years
7 June 2069 34,662 8 Jupiter years
14 July 2069 34,699 95 Earth years
6 August 2069 34,722 3 gigaseconds
6 August 2069 34,722 50,000,000 minutes
30 August 2069 34,746 35 e years
11 May 2070 35,000 35,000 days
17 June 2070 35,037 51 Mars years
14 July 2070 35,064 96 Earth years
11 November 2070 35,184 400 Mercury years
1 July 2071 35,416 51,000,000 minutes
14 July 2071 35,429 97 Earth years
13 September 2071 35,490 1,300 lunar orbits
2 December 2071 35,570 31 Pi years
4 May 2072 35,724 52 Mars years
19 May 2072 35,739 36 e years
14 July 2072 35,795 98 Earth years
18 December 2072 35,952 160 Venus years
4 February 2073 36,000 36,000 days
20 February 2073 36,016 8 Hydrogen 3 (Tritium) half-lives
9 April 2073 36,064 410 Mercury years
26 May 2073 36,111 52,000,000 minutes
14 July 2073 36,160 99 Earth years
22 March 2074 36,411 53 Mars years
14 July 2074 36,525 100 Earth years
2 September 2074 36,575 19 Cobalt 60 half-lives
23 January 2075 36,718 32 Pi years
6 February 2075 36,732 37 e years
20 April 2075 36,805 53,000,000 minutes
14 July 2075 36,890 101 Earth years
5 September 2075 36,943 420 Mercury years
1 November 2075 37,000 37,000 days
31 December 2075 37,060 90 Full moon cycles
7 February 2076 37,098 54 Mars years
14 July 2076 37,256 102 Earth years
15 March 2077 37,500 54,000,000 minutes
15 March 2077 37,500 900,000 hours
14 July 2077 37,621 103 Earth years
25 October 2077 37,724 38 e years
25 December 2077 37,785 55 Mars years
1 February 2078 37,823 430 Mercury years
15 March 2078 37,865 33 Pi years
14 July 2078 37,986 104 Earth years
28 July 2078 38,000 38,000 days
3 December 2078 38,128 110 Draconic years
7 February 2079 38,194 55,000,000 minutes
12 February 2079 38,199 170 Venus years
5 March 2079 38,220 1,400 lunar orbits
25 March 2079 38,240 8 Californium 250 half-lives
15 June 2079 38,322 6,000 Pluto days
14 July 2079 38,351 105 Earth years
12 November 2079 38,472 56 Mars years
10 December 2079 38,500 20 Cobalt 60 half-lives
29 June 2080 38,702 440 Mercury years
14 July 2080 38,717 39 e years
14 July 2080 38,717 106 Earth years
2 January 2081 38,889 56,000,000 minutes
17 April 2081 38,994 9 Jupiter years
23 April 2081 39,000 39,000 days
6 May 2081 39,013 34 Pi years
14 July 2081 39,082 107 Earth years
29 September 2081 39,159 57 Mars years
14 July 2082 39,447 108 Earth years
26 November 2082 39,582 450 Mercury years
27 November 2082 39,583 57,000,000 minutes
3 April 2083 39,710 40 e years
14 July 2083 39,812 109 Earth years
17 August 2083 39,846 58 Mars years
18 January 2084 40,000 40,000 days
26 June 2084 40,160 35 Pi years
14 July 2084 40,178 110 Earth years
22 October 2084 40,278 58,000,000 minutes
18 March 2085 40,425 21 Cobalt 60 half-lives
8 April 2085 40,446 180 Venus years
24 April 2085 40,462 460 Mercury years
19 June 2085 40,518 9 Hydrogen 3 (Tritium) half-lives
4 July 2085 40,533 59 Mars years
14 July 2085 40,543 111 Earth years
21 December 2085 40,703 41 e years
14 July 2086 40,908 112 Earth years
25 August 2086 40,950 1,500 lunar orbits
16 September 2086 40,972 59,000,000 minutes
14 October 2086 41,000 41,000 days
10 April 2087 41,178 100 Full moon cycles
22 May 2087 41,220 60 Mars years
14 July 2087 41,273 113 Earth years
18 August 2087 41,308 36 Pi years
20 September 2087 41,341 470 Mercury years
6 November 2087 41,388 3 reigns of Henry VIII
30 May 2088 41,594 120 Draconic years
14 July 2088 41,639 114 Earth years
10 August 2088 41,666 60,000,000 minutes
11 August 2088 41,667 1,000,000 hours
8 September 2088 41,695 42 e years
8 April 2089 41,907 61 Mars years
10 July 2089 42,000 42,000 days
14 July 2089 42,004 115 Earth years
16 February 2090 42,221 480 Mercury years
25 June 2090 42,350 22 Cobalt 60 half-lives
6 July 2090 42,361 61,000,000 minutes
14 July 2090 42,369 116 Earth years
8 October 2090 42,455 37 Pi years
22 February 2091 42,592 4 Curium 243 half-lives
24 February 2091 42,594 62 Mars years
29 May 2091 42,688 43 e years
3 June 2091 42,693 190 Venus years
14 July 2091 42,734 117 Earth years
5 April 2092 43,000 43,000 days
25 April 2092 43,020 9 Californium 250 half-lives
30 May 2092 43,055 62,000,000 minutes
14 July 2092 43,100 490 Mercury years
14 July 2092 43,100 118 Earth years
11 January 2093 43,281 63 Mars years
26 February 2093 43,327 10 Jupiter years
27 February 2093 43,328 4 Saturn years
14 July 2093 43,465 119 Earth years
28 November 2093 43,602 38 Pi years
14 February 2094 43,680 1,600 lunar orbits
15 February 2094 43,681 44 e years
25 April 2094 43,750 63,000,000 minutes
14 July 2094 43,830 120 Earth years
29 November 2094 43,968 64 Mars years
11 December 2094 43,980 500 Mercury years
31 December 2094 44,000 44,000 days
14 July 2095 44,195 121 Earth years
2 October 2095 44,275 23 Cobalt 60 half-lives
19 March 2096 44,444 44444 days
19 March 2096 44,444 64,000,000 minutes
14 July 2096 44,561 122 Earth years
16 October 2096 44,655 65 Mars years
9 December 2096 44,709 7,000 Pluto days
19 January 2097 44,750 39 Pi years
9 May 2097 44,860 510 Mercury years
14 July 2097 44,926 123 Earth years
28 July 2097 44,940 200 Venus years
26 September 2097 45,000 45,000 days
16 October 2097 45,020 10 Hydrogen 3 (Tritium) half-lives
26 November 2097 45,061 130 Draconic years
12 February 2098 45,139 65,000,000 minutes
14 July 2098 45,291 124 Earth years
19 July 2098 45,296 110 Full moon cycles
3 September 2098 45,342 66 Mars years
14 July 2099 45,656 125 Earth years
5 October 2099 45,739 520 Mercury years
7 January 2100 45,833 66,000,000 minutes
7 January 2100 45,833 1,100,000 hours
12 March 2100 45,897 40 Pi years
23 June 2100 46,000 46,000 days
14 July 2100 46,021 126 Earth years
22 July 2100 46,029 67 Mars years
9 January 2101 46,200 24 Cobalt 60 half-lives
15 April 2101 46,296 4 gigaseconds
26 June 2101 46,368 24th Fibonacci number days
14 July 2101 46,386 127 Earth years
7 August 2101 46,410 1,700 lunar orbits
18 September 2101 46,452 2 reigns of Queen Victoria
2 December 2101 46,527 67,000,000 minutes
4 March 2102 46,619 530 Mercury years
9 June 2102 46,716 68 Mars years
14 July 2102 46,751 128 Earth years
20 March 2103 47,000 47,000 days
4 May 2103 47,045 41 Pi years
14 July 2103 47,116 129 Earth years
23 September 2103 47,187 210 Venus years
28 October 2103 47,222 68,000,000 minutes
26 April 2104 47,403 69 Mars years
14 July 2104 47,482 130 Earth years
30 July 2104 47,498 540 Mercury years
8 January 2105 47,660 11 Jupiter years
28 May 2105 47,800 10 Californium 250 half-lives
14 July 2105 47,847 131 Earth years
21 September 2105 47,916 69,000,000 minutes
14 December 2105 48,000 48,000 days
14 March 2106 48,090 70 Mars years
18 April 2106 48,125 25 Cobalt 60 half-lives
24 June 2106 48,192 42 Pi years
14 July 2106 48,212 132 Earth years
27 December 2106 48,378 550 Mercury years
25 May 2107 48,527 140 Draconic years
14 July 2107 48,577 133 Earth years
17 August 2107 48,611 70,000,000 minutes
30 January 2108 48,777 71 Mars years
14 July 2108 48,943 134 Earth years
9 September 2108 49,000 49,000 days
27 January 2109 49,140 1,800 lunar orbits
25 May 2109 49,258 560 Mercury years
11 July 2109 49,305 71,000,000 minutes
14 July 2109 49,308 135 Earth years
15 August 2109 49,340 43 Pi years
28 October 2109 49,414 120 Full moon cycles
17 November 2109 49,434 220 Venus years
17 December 2109 49,464 72 Mars years
13 February 2110 49,522 11 Hydrogen 3 (Tritium) half-lives
14 July 2110 49,673 136 Earth years
6 June 2111 50,000 50,000 days
6 June 2111 50,000 72,000,000 minutes
6 June 2111 50,000 1,200,000 hours
End of time ∞ Infinity-versary

Hide Planets   |   Hide Constants   |   Hide Half-Lives

DateDaysEvent
15 July 1974 1 One day
20 July 1974 6 1st even-perfect-number days
21 July 1974 7 One week
10 August 1974 27 1 lunar orbit
11 August 1974 28 2nd even-perfect-number days
14 August 1974 31 One month
25 August 1974 42 Life-universe-and-everything
7 September 1974 55 10th Fibonacci number days
21 September 1974 69 Naughty-versary
22 September 1974 70 Smallest-weird-number days
11 October 1974 89 11th Fibonacci number days
22 October 1974 100 100 days
14 November 1974 123 123 days
5 December 1974 144 12th Fibonacci number days
30 January 1975 200 200 days
4 March 1975 233 13th Fibonacci number days
13 April 1975 273 10 lunar orbits
10 May 1975 300 300 days
10 May 1975 300 Sparta!
31 May 1975 321 321 days
14 July 1975 365 1 Earth year
26 July 1975 377 14th Fibonacci number days
18 August 1975 400 400 days
22 August 1975 404 Anniversary Not Found
22 November 1975 496 3rd even-perfect-number days
26 November 1975 500 500 days
29 November 1975 503 Anniversary Forbidden
12 December 1975 516 1 Root-2 years
25 February 1976 591 1 Golden ratio years
5 March 1976 600 600 days
15 March 1976 610 15th Fibonacci number days
10 May 1976 666 Lucifersary
31 May 1976 687 1 Mars year
7 June 1976 694 1,000,000 minutes
13 June 1976 700 700 days
14 July 1976 731 2 Earth years
14 August 1976 762 Feynman-point days
21 September 1976 800 800 days
21 November 1976 861 123 weeks
10 December 1976 880 10 Mercury years
30 December 1976 900 900 days
27 March 1977 987 16th Fibonacci number days
2 April 1977 993 1 e years
9 April 1977 1,000 1,000 days
12 May 1977 1,033 2 Root-2 years
14 July 1977 1,096 3 Earth years
29 July 1977 1,111 1111 days
3 September 1977 1,147 1 Pi years
8 October 1977 1,182 2 Golden ratio years
6 November 1977 1,211 4th look-and-say number days
29 November 1977 1,234 1234 days
12 March 1978 1,337 1337 days
9 April 1978 1,365 50 lunar orbits
18 April 1978 1,374 2 Mars years
3 May 1978 1,389 2,000,000 minutes
14 July 1978 1,461 4 Earth years
10 October 1978 1,549 3 Root-2 years
27 November 1978 1,597 17th Fibonacci number days
8 April 1979 1,729 Hardy-Ramanujan-number days
8 May 1979 1,759 20 Mercury years
22 May 1979 1,773 3 Golden ratio years
14 July 1979 1,826 5 Earth years
21 October 1979 1,925 1 Cobalt 60 half-lives
20 December 1979 1,985 2 e years
22 December 1979 1,987 300th prime number (1987) days
4 January 1980 2,000 2,000 days
5 March 1980 2,061 3 Mars years
10 March 1980 2,066 4 Root-2 years
27 March 1980 2,083 3,000,000 minutes
14 July 1980 2,192 6 Earth years
13 August 1980 2,222 2222 days
7 September 1980 2,247 321 weeks
7 September 1980 2,247 10 Venus years
25 October 1980 2,295 2 Pi years
10 November 1980 2,311 5th Euclid-prime days
2 January 1981 2,364 4 Golden ratio years
14 July 1981 2,557 7 Earth years
8 August 1981 2,582 5 Root-2 years
10 August 1981 2,584 18th Fibonacci number days
4 October 1981 2,639 30 Mercury years
3 January 1982 2,730 100 lunar orbits
21 January 1982 2,748 4 Mars years
20 February 1982 2,778 4,000,000 minutes
14 July 1982 2,922 8 Earth years
16 August 1982 2,955 5 Golden ratio years
8 September 1982 2,978 3 e years
30 September 1982 3,000 3,000 days
7 January 1983 3,099 6 Root-2 years
11 April 1983 3,193 500 Pluto days
14 July 1983 3,287 9 Earth years
29 August 1983 3,333 3333 days
9 December 1983 3,435 5 Mars years
16 December 1983 3,442 3 Pi years
9 January 1984 3,466 10 Draconic years
15 January 1984 3,472 5,000,000 minutes
1 March 1984 3,518 40 Mercury years
29 March 1984 3,546 6 Golden ratio years
6 June 1984 3,615 7 Root-2 years
14 July 1984 3,653 10 Earth years
27 January 1985 3,850 2 Cobalt 60 half-lives
28 May 1985 3,971 4 e years
26 June 1985 4,000 4,000 days
14 July 1985 4,018 11 Earth years
8 October 1985 4,104 Second-positive-integer-which-can-be-expressed-as-the-sum-of-two-positive-cubes-in-two-different-ways days
22 October 1985 4,118 10 Full moon cycles
26 October 1985 4,122 6 Mars years
5 November 1985 4,132 8 Root-2 years
10 November 1985 4,137 7 Golden ratio years
10 December 1985 4,167 6,000,000 minutes
10 December 1985 4,167 100,000 hours
24 December 1985 4,181 19th Fibonacci number days
13 May 1986 4,321 4321 days
25 May 1986 4,333 1 Jupiter year
14 July 1986 4,383 12 Earth years
29 July 1986 4,398 50 Mercury years
13 September 1986 4,444 4444 days
2 November 1986 4,494 20 Venus years
10 November 1986 4,502 1 Hydrogen 3 (Tritium) half-lives
6 February 1987 4,590 4 Pi years
5 April 1987 4,648 9 Root-2 years
24 June 1987 4,728 8 Golden ratio years
14 July 1987 4,748 13 Earth years
15 August 1987 4,780 1 Californium 250 half-lives
13 September 1987 4,809 7 Mars years
4 November 1987 4,861 7,000,000 minutes
15 February 1988 4,964 5 e years
22 March 1988 5,000 5,000 days
1 May 1988 5,040 8th colossally-abundant-number days
14 July 1988 5,114 14 Earth years
3 September 1988 5,165 10 Root-2 years
25 December 1988 5,278 60 Mercury years
4 February 1989 5,319 9 Golden ratio years
25 June 1989 5,460 200 lunar orbits
14 July 1989 5,479 15 Earth years
31 July 1989 5,496 8 Mars years
28 September 1989 5,555 5555 days
29 September 1989 5,556 8,000,000 minutes
1 February 1990 5,681 11 Root-2 years
29 March 1990 5,737 5 Pi years
6 May 1990 5,775 3 Cobalt 60 half-lives
14 July 1990 5,844 16 Earth years
18 September 1990 5,910 10 Golden ratio years
3 November 1990 5,956 6 e years
17 December 1990 6,000 6,000 days
23 May 1991 6,157 70 Mercury years
9 June 1991 6,174 Kaprekar's-constant days
18 June 1991 6,183 9 Mars years
3 July 1991 6,198 12 Root-2 years
14 July 1991 6,209 17 Earth years
24 August 1991 6,250 9,000,000 minutes
8 January 1992 6,387 1,000 Pluto days
1 May 1992 6,501 11 Golden ratio years
14 July 1992 6,575 18 Earth years
13 October 1992 6,666 6666 days
30 November 1992 6,714 13 Root-2 years
27 December 1992 6,741 30 Venus years
20 January 1993 6,765 20th Fibonacci number days
5 May 1993 6,870 10 Mars years
20 May 1993 6,885 6 Pi years
6 July 1993 6,932 20 Draconic years
14 July 1993 6,940 19 Earth years
18 July 1993 6,944 10,000,000 minutes
23 July 1993 6,949 7 e years
12 September 1993 7,000 7,000 days
19 October 1993 7,037 80 Mercury years
13 December 1993 7,092 12 Golden ratio years
30 April 1994 7,230 14 Root-2 years
14 July 1994 7,305 20 Earth years
23 March 1995 7,557 11 Mars years
13 June 1995 7,639 11,000,000 minutes
14 July 1995 7,670 21 Earth years
27 July 1995 7,683 13 Golden ratio years
13 August 1995 7,700 4 Cobalt 60 half-lives
29 September 1995 7,747 15 Root-2 years
29 October 1995 7,777 7777 days
16 March 1996 7,916 90 Mercury years
11 April 1996 7,942 8 e years
8 June 1996 8,000 8,000 days
10 July 1996 8,032 7 Pi years
14 July 1996 8,036 22 Earth years
14 October 1996 8,128 4th even-perfect-number days
15 December 1996 8,190 300 lunar orbits
30 January 1997 8,236 20 Full moon cycles
7 February 1997 8,244 12 Mars years
26 February 1997 8,263 16 Root-2 years
9 March 1997 8,274 14 Golden ratio years
7 May 1997 8,333 12,000,000 minutes
7 May 1997 8,333 200,000 hours
14 July 1997 8,401 23 Earth years
8 March 1998 8,638 1234 weeks
4 April 1998 8,665 2 Jupiter years
14 July 1998 8,766 24 Earth years
28 July 1998 8,780 17 Root-2 years
13 August 1998 8,796 100 Mercury years
21 October 1998 8,865 15 Golden ratio years
13 November 1998 8,888 8888 days
26 December 1998 8,931 13 Mars years
30 December 1998 8,935 9 e years
21 February 1999 8,988 40 Venus years
5 March 1999 9,000 9,000 days
9 March 1999 9,004 2 Hydrogen 3 (Tritium) half-lives
2 April 1999 9,028 13,000,000 minutes
14 July 1999 9,131 25 Earth years
31 August 1999 9,179 8 Pi years
26 December 1999 9,296 18 Root-2 years
3 June 2000 9,456 16 Golden ratio years
14 July 2000 9,497 26 Earth years
15 September 2000 9,560 2 Californium 250 half-lives
12 November 2000 9,618 14 Mars years
19 November 2000 9,625 5 Cobalt 60 half-lives
9 January 2001 9,676 110 Mercury years
24 February 2001 9,722 14,000,000 minutes
26 May 2001 9,813 19 Root-2 years
14 July 2001 9,862 27 Earth years
17 September 2001 9,927 10 e years
28 November 2001 9,999 9999 days
29 November 2001 10,000 10,000 days
15 January 2002 10,047 17 Golden ratio years
14 July 2002 10,227 28 Earth years
30 September 2002 10,305 15 Mars years
22 October 2002 10,327 9 Pi years
24 October 2002 10,329 20 Root-2 years
2 January 2003 10,399 30 Draconic years
20 January 2003 10,417 15,000,000 minutes
7 June 2003 10,555 120 Mercury years
14 July 2003 10,592 29 Earth years
29 August 2003 10,638 18 Golden ratio years
8 September 2003 10,648 1 Curium 243 half-lives
10 March 2004 10,832 1 Saturn year
24 March 2004 10,846 21 Root-2 years
6 June 2004 10,920 400 lunar orbits
6 June 2004 10,920 11 e years
2 July 2004 10,946 21st Fibonacci number days
14 July 2004 10,958 30 Earth years
17 August 2004 10,992 16 Mars years
25 August 2004 11,000 11,000 days
14 December 2004 11,111 11111 days
14 December 2004 11,111 16,000,000 minutes
11 April 2005 11,229 19 Golden ratio years
17 April 2005 11,235 50 Venus years
14 July 2005 11,323 31 Earth years
22 August 2005 11,362 22 Root-2 years
3 November 2005 11,435 130 Mercury years
12 December 2005 11,474 10 Pi years
26 February 2006 11,550 6 Cobalt 60 half-lives
22 March 2006 11,574 1 gigasecond
5 July 2006 11,679 17 Mars years
14 July 2006 11,688 32 Earth years
8 November 2006 11,805 17,000,000 minutes
22 November 2006 11,819 20 Golden ratio years
21 January 2007 11,879 23 Root-2 years
24 February 2007 11,913 12 e years
22 May 2007 12,000 12,000 days
14 July 2007 12,053 33 Earth years
31 March 2008 12,314 140 Mercury years
1 May 2008 12,345 12345 days
9 May 2008 12,353 30 Full moon cycles
22 May 2008 12,366 18 Mars years
20 June 2008 12,395 24 Root-2 years
5 July 2008 12,410 21 Golden ratio years
14 July 2008 12,419 34 Earth years
3 October 2008 12,500 18,000,000 minutes
3 October 2008 12,500 300,000 hours
2 February 2009 12,622 11 Pi years
4 July 2009 12,774 2,000 Pluto days
14 July 2009 12,784 35 Earth years
13 November 2009 12,906 13 e years
19 November 2009 12,912 25 Root-2 years
13 February 2010 12,998 3 Jupiter years
15 February 2010 13,000 13,000 days
16 February 2010 13,001 22 Golden ratio years
9 April 2010 13,053 19 Mars years
14 July 2010 13,149 36 Earth years
28 August 2010 13,194 19,000,000 minutes
28 August 2010 13,194 150 Mercury years
19 April 2011 13,428 26 Root-2 years
5 June 2011 13,475 7 Cobalt 60 half-lives
12 June 2011 13,482 60 Venus years
6 July 2011 13,506 3 Hydrogen 3 (Tritium) half-lives
14 July 2011 13,514 37 Earth years
30 September 2011 13,592 23 Golden ratio years
27 November 2011 13,650 500 lunar orbits
25 February 2012 13,740 20 Mars years
25 March 2012 13,769 12 Pi years
21 April 2012 13,796 1 reign of Henry VIII
29 June 2012 13,865 40 Draconic years
14 July 2012 13,880 38 Earth years
23 July 2012 13,889 20,000,000 minutes
1 August 2012 13,898 14 e years
17 September 2012 13,945 27 Root-2 years
11 November 2012 14,000 14,000 days
24 January 2013 14,074 160 Mercury years
13 May 2013 14,183 24 Golden ratio years
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