Mathaversaries

29th July, 1972

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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
1 June 2013 14,917 13 Pi years
7 July 2013 14,953 170 Mercury years
29 July 2013 14,975 41 Earth years
31 July 2013 14,977 29 Root-2 years
23 August 2013 15,000 15,000 days
15 December 2013 15,114 22 Mars years
28 May 2014 15,278 22,000,000 minutes
29 July 2014 15,340 42 Earth years
23 August 2014 15,365 26 Golden ratio years
27 September 2014 15,400 8 Cobalt 60 half-lives
30 December 2014 15,494 30 Root-2 years
29 July 2015 15,705 43 Earth years
22 August 2015 15,729 70 Venus years
2 November 2015 15,801 23 Mars years
4 December 2015 15,833 180 Mercury years
24 January 2016 15,884 16 e years
5 April 2016 15,956 27 Golden ratio years
21 April 2016 15,972 23,000,000 minutes
19 May 2016 16,000 16,000 days
29 May 2016 16,010 31 Root-2 years
22 July 2016 16,064 14 Pi years
29 July 2016 16,071 44 Earth years
3 June 2017 16,380 600 lunar orbits
29 July 2017 16,436 45 Earth years
2 September 2017 16,471 40 Full moon cycles
19 September 2017 16,488 24 Mars years
28 October 2017 16,527 32 Root-2 years
17 November 2017 16,547 28 Golden ratio years
17 March 2018 16,667 24,000,000 minutes
17 March 2018 16,667 400,000 hours
1 May 2018 16,712 190 Mercury years
29 July 2018 16,801 46 Earth years
13 October 2018 16,877 17 e years
13 February 2019 17,000 17,000 days
28 March 2019 17,043 33 Root-2 years
1 July 2019 17,138 29 Golden ratio years
29 July 2019 17,166 47 Earth years
7 August 2019 17,175 25 Mars years
12 September 2019 17,211 15 Pi years
4 January 2020 17,325 9 Cobalt 60 half-lives
10 January 2020 17,331 50 Draconic years
10 January 2020 17,331 4 Jupiter years
9 February 2020 17,361 25,000,000 minutes
29 July 2020 17,532 48 Earth years
26 August 2020 17,560 34 Root-2 years
27 September 2020 17,592 200 Mercury years
24 January 2021 17,711 22nd Fibonacci number days
11 February 2021 17,729 30 Golden ratio years
24 June 2021 17,862 26 Mars years
1 July 2021 17,869 18 e years
29 July 2021 17,897 49 Earth years
16 October 2021 17,976 80 Venus years
9 November 2021 18,000 18,000 days
17 November 2021 18,008 4 Hydrogen 3 (Tritium) half-lives
3 January 2022 18,055 26,000,000 minutes
24 January 2022 18,076 35 Root-2 years
29 July 2022 18,262 50 Earth years
25 September 2022 18,320 31 Golden ratio years
3 November 2022 18,359 16 Pi years
24 February 2023 18,472 210 Mercury years
12 May 2023 18,549 27 Mars years
25 June 2023 18,593 36 Root-2 years
29 July 2023 18,627 51 Earth years
29 November 2023 18,750 27,000,000 minutes
20 March 2024 18,862 19 e years
8 May 2024 18,911 32 Golden ratio years
29 July 2024 18,993 52 Earth years
5 August 2024 19,000 19,000 days
22 November 2024 19,109 37 Root-2 years
23 November 2024 19,110 700 lunar orbits
3 December 2024 19,120 4 Californium 250 half-lives
13 January 2025 19,161 3,000 Pluto days
29 March 2025 19,236 28 Mars years
12 April 2025 19,250 10 Cobalt 60 half-lives
22 July 2025 19,351 220 Mercury years
29 July 2025 19,358 53 Earth years
23 October 2025 19,444 28,000,000 minutes
20 December 2025 19,502 33 Golden ratio years
24 December 2025 19,506 17 Pi years
23 April 2026 19,626 38 Root-2 years
29 July 2026 19,723 54 Earth years
8 December 2026 19,855 20 e years
14 February 2027 19,923 29 Mars years
2 May 2027 20,000 20,000 days
29 July 2027 20,088 55 Earth years
3 August 2027 20,093 34 Golden ratio years
18 September 2027 20,139 29,000,000 minutes
21 September 2027 20,142 39 Root-2 years
11 December 2027 20,223 90 Venus years
19 December 2027 20,231 230 Mercury years
29 July 2028 20,454 56 Earth years
11 December 2028 20,589 50 Full moon cycles
1 January 2029 20,610 30 Mars years
14 February 2029 20,654 18 Pi years
19 February 2029 20,659 40 Root-2 years
16 March 2029 20,684 35 Golden ratio years
7 July 2029 20,797 60 Draconic years
29 July 2029 20,819 57 Earth years
12 August 2029 20,833 30,000,000 minutes
12 August 2029 20,833 500,000 hours
27 August 2029 20,848 21 e years
26 January 2030 21,000 21,000 days
16 May 2030 21,110 240 Mercury years
20 July 2030 21,175 41 Root-2 years
20 July 2030 21,175 11 Cobalt 60 half-lives
29 July 2030 21,184 58 Earth years
28 October 2030 21,275 36 Golden ratio years
18 November 2030 21,296 2 Curium 243 half-lives
19 November 2030 21,297 31 Mars years
8 July 2031 21,528 31,000,000 minutes
29 July 2031 21,549 59 Earth years
21 November 2031 21,664 5 Jupiter years
21 November 2031 21,664 2 Saturn years
18 December 2031 21,691 42 Root-2 years
6 April 2032 21,801 19 Pi years
15 May 2032 21,840 800 lunar orbits
15 May 2032 21,840 22 e years
10 June 2032 21,866 37 Golden ratio years
29 July 2032 21,915 60 Earth years
6 October 2032 21,984 32 Mars years
12 October 2032 21,990 250 Mercury years
22 October 2032 22,000 22,000 days
18 May 2033 22,208 43 Root-2 years
1 June 2033 22,222 22222 days
1 June 2033 22,222 32,000,000 minutes
29 July 2033 22,280 61 Earth years
22 January 2034 22,457 38 Golden ratio years
4 February 2034 22,470 100 Venus years
16 March 2034 22,510 5 Hydrogen 3 (Tritium) half-lives
29 July 2034 22,645 62 Earth years
24 August 2034 22,671 33 Mars years
16 October 2034 22,724 44 Root-2 years
2 February 2035 22,833 23 e years
11 March 2035 22,870 260 Mercury years
27 April 2035 22,917 33,000,000 minutes
29 May 2035 22,949 20 Pi years
19 July 2035 23,000 23,000 days
29 July 2035 23,010 63 Earth years
5 September 2035 23,048 39 Golden ratio years
27 October 2035 23,100 12 Cobalt 60 half-lives
14 December 2035 23,148 2 gigaseconds
1 March 2036 23,226 1 reign of Queen Victoria
11 July 2036 23,358 34 Mars years
29 July 2036 23,376 64 Earth years
21 March 2037 23,611 34,000,000 minutes
18 April 2037 23,639 40 Golden ratio years
29 July 2037 23,741 65 Earth years
6 August 2037 23,749 270 Mercury years
22 October 2037 23,826 24 e years
4 January 2038 23,900 5 Californium 250 half-lives
14 April 2038 24,000 24,000 days
29 May 2038 24,045 35 Mars years
19 July 2038 24,096 21 Pi years
29 July 2038 24,106 66 Earth years
30 November 2038 24,230 41 Golden ratio years
2 January 2039 24,263 70 Draconic years
13 February 2039 24,305 35,000,000 minutes
29 July 2039 24,471 67 Earth years
5 November 2039 24,570 900 lunar orbits
3 January 2040 24,629 280 Mercury years
21 March 2040 24,707 60 Full moon cycles
31 March 2040 24,717 110 Venus years
15 April 2040 24,732 36 Mars years
11 July 2040 24,819 25 e years
13 July 2040 24,821 42 Golden ratio years
29 July 2040 24,837 68 Earth years
8 January 2041 25,000 25,000 days
8 January 2041 25,000 36,000,000 minutes
8 January 2041 25,000 600,000 hours
2 February 2041 25,025 13 Cobalt 60 half-lives
29 July 2041 25,202 69 Earth years
9 September 2041 25,244 22 Pi years
24 February 2042 25,412 43 Golden ratio years
3 March 2042 25,419 37 Mars years
31 May 2042 25,508 290 Mercury years
10 July 2042 25,548 4,000 Pluto days
29 July 2042 25,567 70 Earth years
3 December 2042 25,694 37,000,000 minutes
30 March 2043 25,811 26 e years
29 July 2043 25,932 71 Earth years
1 October 2043 25,996 6 Jupiter years
5 October 2043 26,000 26,000 days
8 October 2043 26,003 44 Golden ratio years
19 January 2044 26,106 38 Mars years
29 July 2044 26,298 72 Earth years
27 October 2044 26,388 300 Mercury years
28 October 2044 26,389 38,000,000 minutes
30 October 2044 26,391 23 Pi years
29 July 2045 26,663 73 Earth years
6 December 2045 26,793 39 Mars years
17 December 2045 26,804 27 e years
12 May 2046 26,950 14 Cobalt 60 half-lives
26 May 2046 26,964 120 Venus years
1 July 2046 27,000 27,000 days
13 July 2046 27,012 6 Hydrogen 3 (Tritium) half-lives
29 July 2046 27,028 74 Earth years
22 September 2046 27,083 39,000,000 minutes
26 March 2047 27,268 310 Mercury years
27 April 2047 27,300 1,000 lunar orbits
29 July 2047 27,393 75 Earth years
24 October 2047 27,480 40 Mars years
21 December 2047 27,538 24 Pi years
13 February 2048 27,592 2 reigns of Henry VIII
30 June 2048 27,730 80 Draconic years
29 July 2048 27,759 76 Earth years
17 August 2048 27,778 40,000,000 minutes
5 September 2048 27,797 28 e years
27 March 2049 28,000 28,000 days
29 July 2049 28,124 77 Earth years
21 August 2049 28,147 320 Mercury years
10 September 2049 28,167 41 Mars years
12 July 2050 28,472 41,000,000 minutes
29 July 2050 28,489 78 Earth years
13 January 2051 28,657 23rd Fibonacci number days
5 February 2051 28,680 6 Californium 250 half-lives
11 February 2051 28,686 25 Pi years
26 May 2051 28,790 29 e years
30 June 2051 28,825 70 Full moon cycles
29 July 2051 28,854 42 Mars years
29 July 2051 28,854 79 Earth years
19 August 2051 28,875 15 Cobalt 60 half-lives
22 December 2051 29,000 29,000 days
18 January 2052 29,027 330 Mercury years
5 June 2052 29,166 42,000,000 minutes
6 June 2052 29,167 700,000 hours
20 July 2052 29,211 130 Venus years
29 July 2052 29,220 80 Earth years
15 June 2053 29,541 43 Mars years
29 July 2053 29,585 81 Earth years
11 February 2054 29,782 30 e years
3 April 2054 29,833 26 Pi years
1 May 2054 29,861 43,000,000 minutes
15 June 2054 29,906 340 Mercury years
29 July 2054 29,950 82 Earth years
17 September 2054 30,000 30,000 days
17 October 2054 30,030 1,100 lunar orbits
3 May 2055 30,228 44 Mars years
22 May 2055 30,247 4321 weeks
29 July 2055 30,315 83 Earth years
12 August 2055 30,329 7 Jupiter years
25 March 2056 30,555 44,000,000 minutes
29 July 2056 30,681 84 Earth years
31 October 2056 30,775 31 e years
11 November 2056 30,786 350 Mercury years
25 November 2056 30,800 16 Cobalt 60 half-lives
20 March 2057 30,915 45 Mars years
25 May 2057 30,981 27 Pi years
13 June 2057 31,000 31,000 days
29 July 2057 31,046 85 Earth years
26 December 2057 31,196 90 Draconic years
18 February 2058 31,250 45,000,000 minutes
29 July 2058 31,411 86 Earth years
14 September 2058 31,458 140 Venus years
9 November 2058 31,514 7 Hydrogen 3 (Tritium) half-lives
5 February 2059 31,602 46 Mars years
10 April 2059 31,666 360 Mercury years
21 July 2059 31,768 32 e years
29 July 2059 31,776 87 Earth years
4 January 2060 31,935 5,000 Pluto days
13 January 2060 31,944 46,000,000 minutes
13 January 2060 31,944 3 Curium 243 half-lives
9 March 2060 32,000 32,000 days
15 July 2060 32,128 28 Pi years
29 July 2060 32,142 88 Earth years
23 December 2060 32,289 47 Mars years
18 July 2061 32,496 3 Saturn years
29 July 2061 32,507 89 Earth years
5 September 2061 32,545 370 Mercury years
8 December 2061 32,639 47,000,000 minutes
4 March 2062 32,725 17 Cobalt 60 half-lives
8 April 2062 32,760 1,200 lunar orbits
9 April 2062 32,761 33 e years
29 July 2062 32,872 90 Earth years
7 October 2062 32,942 80 Full moon cycles
10 November 2062 32,976 48 Mars years
4 December 2062 33,000 33,000 days
29 July 2063 33,237 91 Earth years
6 September 2063 33,276 29 Pi years
2 November 2063 33,333 33333 days
2 November 2063 33,333 48,000,000 minutes
2 November 2063 33,333 800,000 hours
2 February 2064 33,425 380 Mercury years
8 March 2064 33,460 7 Californium 250 half-lives
29 July 2064 33,603 92 Earth years
27 September 2064 33,663 49 Mars years
8 November 2064 33,705 150 Venus years
26 December 2064 33,753 34 e years
29 July 2065 33,968 93 Earth years
30 August 2065 34,000 34,000 days
27 September 2065 34,028 49,000,000 minutes
30 June 2066 34,304 390 Mercury years
29 July 2066 34,333 94 Earth years
15 August 2066 34,350 50 Mars years
27 October 2066 34,423 30 Pi years
11 June 2067 34,650 18 Cobalt 60 half-lives
23 June 2067 34,662 100 Draconic years
23 June 2067 34,662 8 Jupiter years
29 July 2067 34,698 95 Earth years
22 August 2067 34,722 3 gigaseconds
22 August 2067 34,722 50,000,000 minutes
15 September 2067 34,746 35 e years
26 May 2068 35,000 35,000 days
2 July 2068 35,037 51 Mars years
29 July 2068 35,064 96 Earth years
26 November 2068 35,184 400 Mercury years
16 July 2069 35,416 51,000,000 minutes
29 July 2069 35,429 97 Earth years
28 September 2069 35,490 1,300 lunar orbits
17 December 2069 35,570 31 Pi years
20 May 2070 35,724 52 Mars years
4 June 2070 35,739 36 e years
29 July 2070 35,794 98 Earth years
3 January 2071 35,952 160 Venus years
20 February 2071 36,000 36,000 days
8 March 2071 36,016 8 Hydrogen 3 (Tritium) half-lives
25 April 2071 36,064 410 Mercury years
11 June 2071 36,111 52,000,000 minutes
29 July 2071 36,159 99 Earth years
6 April 2072 36,411 53 Mars years
29 July 2072 36,525 100 Earth years
17 September 2072 36,575 19 Cobalt 60 half-lives
7 February 2073 36,718 32 Pi years
21 February 2073 36,732 37 e years
5 May 2073 36,805 53,000,000 minutes
29 July 2073 36,890 101 Earth years
20 September 2073 36,943 420 Mercury years
16 November 2073 37,000 37,000 days
15 January 2074 37,060 90 Full moon cycles
22 February 2074 37,098 54 Mars years
29 July 2074 37,255 102 Earth years
31 March 2075 37,500 54,000,000 minutes
31 March 2075 37,500 900,000 hours
29 July 2075 37,620 103 Earth years
10 November 2075 37,724 38 e years
10 January 2076 37,785 55 Mars years
17 February 2076 37,823 430 Mercury years
30 March 2076 37,865 33 Pi years
29 July 2076 37,986 104 Earth years
12 August 2076 38,000 38,000 days
18 December 2076 38,128 110 Draconic years
22 February 2077 38,194 55,000,000 minutes
27 February 2077 38,199 170 Venus years
20 March 2077 38,220 1,400 lunar orbits
9 April 2077 38,240 8 Californium 250 half-lives
30 June 2077 38,322 6,000 Pluto days
29 July 2077 38,351 105 Earth years
27 November 2077 38,472 56 Mars years
25 December 2077 38,500 20 Cobalt 60 half-lives
15 July 2078 38,702 440 Mercury years
29 July 2078 38,716 106 Earth years
30 July 2078 38,717 39 e years
18 January 2079 38,889 56,000,000 minutes
3 May 2079 38,994 9 Jupiter years
9 May 2079 39,000 39,000 days
22 May 2079 39,013 34 Pi years
29 July 2079 39,081 107 Earth years
15 October 2079 39,159 57 Mars years
29 July 2080 39,447 108 Earth years
11 December 2080 39,582 450 Mercury years
12 December 2080 39,583 57,000,000 minutes
18 April 2081 39,710 40 e years
29 July 2081 39,812 109 Earth years
1 September 2081 39,846 58 Mars years
2 February 2082 40,000 40,000 days
12 July 2082 40,160 35 Pi years
29 July 2082 40,177 110 Earth years
7 November 2082 40,278 58,000,000 minutes
3 April 2083 40,425 21 Cobalt 60 half-lives
24 April 2083 40,446 180 Venus years
10 May 2083 40,462 460 Mercury years
5 July 2083 40,518 9 Hydrogen 3 (Tritium) half-lives
20 July 2083 40,533 59 Mars years
29 July 2083 40,542 111 Earth years
6 January 2084 40,703 41 e years
29 July 2084 40,908 112 Earth years
9 September 2084 40,950 1,500 lunar orbits
1 October 2084 40,972 59,000,000 minutes
29 October 2084 41,000 41,000 days
25 April 2085 41,178 100 Full moon cycles
6 June 2085 41,220 60 Mars years
29 July 2085 41,273 113 Earth years
2 September 2085 41,308 36 Pi years
5 October 2085 41,341 470 Mercury years
21 November 2085 41,388 3 reigns of Henry VIII
15 June 2086 41,594 120 Draconic years
29 July 2086 41,638 114 Earth years
26 August 2086 41,666 60,000,000 minutes
27 August 2086 41,667 1,000,000 hours
24 September 2086 41,695 42 e years
24 April 2087 41,907 61 Mars years
26 July 2087 42,000 42,000 days
29 July 2087 42,003 115 Earth years
3 March 2088 42,221 480 Mercury years
10 July 2088 42,350 22 Cobalt 60 half-lives
21 July 2088 42,361 61,000,000 minutes
29 July 2088 42,369 116 Earth years
23 October 2088 42,455 37 Pi years
9 March 2089 42,592 4 Curium 243 half-lives
11 March 2089 42,594 62 Mars years
13 June 2089 42,688 43 e years
18 June 2089 42,693 190 Venus years
29 July 2089 42,734 117 Earth years
21 April 2090 43,000 43,000 days
11 May 2090 43,020 9 Californium 250 half-lives
15 June 2090 43,055 62,000,000 minutes
29 July 2090 43,099 118 Earth years
30 July 2090 43,100 490 Mercury years
27 January 2091 43,281 63 Mars years
14 March 2091 43,327 10 Jupiter years
15 March 2091 43,328 4 Saturn years
29 July 2091 43,464 119 Earth years
14 December 2091 43,602 38 Pi years
1 March 2092 43,680 1,600 lunar orbits
2 March 2092 43,681 44 e years
10 May 2092 43,750 63,000,000 minutes
29 July 2092 43,830 120 Earth years
14 December 2092 43,968 64 Mars years
26 December 2092 43,980 500 Mercury years
15 January 2093 44,000 44,000 days
29 July 2093 44,195 121 Earth years
17 October 2093 44,275 23 Cobalt 60 half-lives
4 April 2094 44,444 44444 days
4 April 2094 44,444 64,000,000 minutes
29 July 2094 44,560 122 Earth years
1 November 2094 44,655 65 Mars years
25 December 2094 44,709 7,000 Pluto days
4 February 2095 44,750 39 Pi years
25 May 2095 44,860 510 Mercury years
29 July 2095 44,925 123 Earth years
13 August 2095 44,940 200 Venus years
12 October 2095 45,000 45,000 days
1 November 2095 45,020 10 Hydrogen 3 (Tritium) half-lives
12 December 2095 45,061 130 Draconic years
28 February 2096 45,139 65,000,000 minutes
29 July 2096 45,291 124 Earth years
3 August 2096 45,296 110 Full moon cycles
18 September 2096 45,342 66 Mars years
29 July 2097 45,656 125 Earth years
20 October 2097 45,739 520 Mercury years
22 January 2098 45,833 66,000,000 minutes
22 January 2098 45,833 1,100,000 hours
27 March 2098 45,897 40 Pi years
8 July 2098 46,000 46,000 days
29 July 2098 46,021 126 Earth years
6 August 2098 46,029 67 Mars years
24 January 2099 46,200 24 Cobalt 60 half-lives
30 April 2099 46,296 4 gigaseconds
11 July 2099 46,368 24th Fibonacci number days
29 July 2099 46,386 127 Earth years
22 August 2099 46,410 1,700 lunar orbits
3 October 2099 46,452 2 reigns of Queen Victoria
17 December 2099 46,527 67,000,000 minutes
19 March 2100 46,619 530 Mercury years
24 June 2100 46,716 68 Mars years
29 July 2100 46,751 128 Earth years
4 April 2101 47,000 47,000 days
19 May 2101 47,045 41 Pi years
29 July 2101 47,116 129 Earth years
8 October 2101 47,187 210 Venus years
12 November 2101 47,222 68,000,000 minutes
12 May 2102 47,403 69 Mars years
29 July 2102 47,481 130 Earth years
15 August 2102 47,498 540 Mercury years
24 January 2103 47,660 11 Jupiter years
13 June 2103 47,800 10 Californium 250 half-lives
29 July 2103 47,846 131 Earth years
7 October 2103 47,916 69,000,000 minutes
30 December 2103 48,000 48,000 days
29 March 2104 48,090 70 Mars years
3 May 2104 48,125 25 Cobalt 60 half-lives
9 July 2104 48,192 42 Pi years
29 July 2104 48,212 132 Earth years
11 January 2105 48,378 550 Mercury years
9 June 2105 48,527 140 Draconic years
29 July 2105 48,577 133 Earth years
1 September 2105 48,611 70,000,000 minutes
14 February 2106 48,777 71 Mars years
29 July 2106 48,942 134 Earth years
25 September 2106 49,000 49,000 days
12 February 2107 49,140 1,800 lunar orbits
10 June 2107 49,258 560 Mercury years
27 July 2107 49,305 71,000,000 minutes
29 July 2107 49,307 135 Earth years
31 August 2107 49,340 43 Pi years
13 November 2107 49,414 120 Full moon cycles
3 December 2107 49,434 220 Venus years
2 January 2108 49,464 72 Mars years
29 February 2108 49,522 11 Hydrogen 3 (Tritium) half-lives
29 July 2108 49,673 136 Earth years
21 June 2109 50,000 50,000 days
21 June 2109 50,000 72,000,000 minutes
21 June 2109 50,000 1,200,000 hours
End of time ∞ Infinity-versary

Hide Planets   |   Hide Constants   |   Hide Half-Lives

DateDaysEvent
30 July 1972 1 One day
4 August 1972 6 1st even-perfect-number days
5 August 1972 7 One week
25 August 1972 27 1 lunar orbit
26 August 1972 28 2nd even-perfect-number days
29 August 1972 31 One month
9 September 1972 42 Life-universe-and-everything
22 September 1972 55 10th Fibonacci number days
6 October 1972 69 Naughty-versary
7 October 1972 70 Smallest-weird-number days
26 October 1972 89 11th Fibonacci number days
6 November 1972 100 100 days
29 November 1972 123 123 days
20 December 1972 144 12th Fibonacci number days
14 February 1973 200 200 days
19 March 1973 233 13th Fibonacci number days
28 April 1973 273 10 lunar orbits
25 May 1973 300 300 days
25 May 1973 300 Sparta!
15 June 1973 321 321 days
29 July 1973 365 1 Earth year
10 August 1973 377 14th Fibonacci number days
2 September 1973 400 400 days
6 September 1973 404 Anniversary Not Found
7 December 1973 496 3rd even-perfect-number days
11 December 1973 500 500 days
14 December 1973 503 Anniversary Forbidden
27 December 1973 516 1 Root-2 years
12 March 1974 591 1 Golden ratio years
21 March 1974 600 600 days
31 March 1974 610 15th Fibonacci number days
26 May 1974 666 Lucifersary
16 June 1974 687 1 Mars year
23 June 1974 694 1,000,000 minutes
29 June 1974 700 700 days
29 July 1974 730 2 Earth years
30 August 1974 762 Feynman-point days
7 October 1974 800 800 days
7 December 1974 861 123 weeks
26 December 1974 880 10 Mercury years
15 January 1975 900 900 days
12 April 1975 987 16th Fibonacci number days
18 April 1975 993 1 e years
25 April 1975 1,000 1,000 days
28 May 1975 1,033 2 Root-2 years
29 July 1975 1,095 3 Earth years
14 August 1975 1,111 1111 days
19 September 1975 1,147 1 Pi years
24 October 1975 1,182 2 Golden ratio years
22 November 1975 1,211 4th look-and-say number days
15 December 1975 1,234 1234 days
27 March 1976 1,337 1337 days
24 April 1976 1,365 50 lunar orbits
3 May 1976 1,374 2 Mars years
18 May 1976 1,389 2,000,000 minutes
29 July 1976 1,461 4 Earth years
25 October 1976 1,549 3 Root-2 years
12 December 1976 1,597 17th Fibonacci number days
23 April 1977 1,729 Hardy-Ramanujan-number days
23 May 1977 1,759 20 Mercury years
6 June 1977 1,773 3 Golden ratio years
29 July 1977 1,826 5 Earth years
5 November 1977 1,925 1 Cobalt 60 half-lives
4 January 1978 1,985 2 e years
6 January 1978 1,987 300th prime number (1987) days
19 January 1978 2,000 2,000 days
21 March 1978 2,061 3 Mars years
26 March 1978 2,066 4 Root-2 years
12 April 1978 2,083 3,000,000 minutes
29 July 1978 2,191 6 Earth years
29 August 1978 2,222 2222 days
23 September 1978 2,247 321 weeks
23 September 1978 2,247 10 Venus years
10 November 1978 2,295 2 Pi years
26 November 1978 2,311 5th Euclid-prime days
18 January 1979 2,364 4 Golden ratio years
29 July 1979 2,556 7 Earth years
24 August 1979 2,582 5 Root-2 years
26 August 1979 2,584 18th Fibonacci number days
20 October 1979 2,639 30 Mercury years
19 January 1980 2,730 100 lunar orbits
6 February 1980 2,748 4 Mars years
7 March 1980 2,778 4,000,000 minutes
29 July 1980 2,922 8 Earth years
31 August 1980 2,955 5 Golden ratio years
23 September 1980 2,978 3 e years
15 October 1980 3,000 3,000 days
22 January 1981 3,099 6 Root-2 years
26 April 1981 3,193 500 Pluto days
29 July 1981 3,287 9 Earth years
13 September 1981 3,333 3333 days
24 December 1981 3,435 5 Mars years
31 December 1981 3,442 3 Pi years
24 January 1982 3,466 10 Draconic years
30 January 1982 3,472 5,000,000 minutes
17 March 1982 3,518 40 Mercury years
14 April 1982 3,546 6 Golden ratio years
22 June 1982 3,615 7 Root-2 years
29 July 1982 3,652 10 Earth years
12 February 1983 3,850 2 Cobalt 60 half-lives
13 June 1983 3,971 4 e years
12 July 1983 4,000 4,000 days
29 July 1983 4,017 11 Earth years
24 October 1983 4,104 Second-positive-integer-which-can-be-expressed-as-the-sum-of-two-positive-cubes-in-two-different-ways days
7 November 1983 4,118 10 Full moon cycles
11 November 1983 4,122 6 Mars years
21 November 1983 4,132 8 Root-2 years
26 November 1983 4,137 7 Golden ratio years
26 December 1983 4,167 6,000,000 minutes
26 December 1983 4,167 100,000 hours
9 January 1984 4,181 19th Fibonacci number days
28 May 1984 4,321 4321 days
9 June 1984 4,333 1 Jupiter year
29 July 1984 4,383 12 Earth years
13 August 1984 4,398 50 Mercury years
28 September 1984 4,444 4444 days
17 November 1984 4,494 20 Venus years
25 November 1984 4,502 1 Hydrogen 3 (Tritium) half-lives
21 February 1985 4,590 4 Pi years
20 April 1985 4,648 9 Root-2 years
9 July 1985 4,728 8 Golden ratio years
29 July 1985 4,748 13 Earth years
30 August 1985 4,780 1 Californium 250 half-lives
28 September 1985 4,809 7 Mars years
19 November 1985 4,861 7,000,000 minutes
2 March 1986 4,964 5 e years
7 April 1986 5,000 5,000 days
17 May 1986 5,040 8th colossally-abundant-number days
29 July 1986 5,113 14 Earth years
19 September 1986 5,165 10 Root-2 years
10 January 1987 5,278 60 Mercury years
20 February 1987 5,319 9 Golden ratio years
11 July 1987 5,460 200 lunar orbits
29 July 1987 5,478 15 Earth years
16 August 1987 5,496 8 Mars years
14 October 1987 5,555 5555 days
15 October 1987 5,556 8,000,000 minutes
17 February 1988 5,681 11 Root-2 years
13 April 1988 5,737 5 Pi years
21 May 1988 5,775 3 Cobalt 60 half-lives
29 July 1988 5,844 16 Earth years
3 October 1988 5,910 10 Golden ratio years
18 November 1988 5,956 6 e years
1 January 1989 6,000 6,000 days
7 June 1989 6,157 70 Mercury years
24 June 1989 6,174 Kaprekar's-constant days
3 July 1989 6,183 9 Mars years
18 July 1989 6,198 12 Root-2 years
29 July 1989 6,209 17 Earth years
8 September 1989 6,250 9,000,000 minutes
23 January 1990 6,387 1,000 Pluto days
17 May 1990 6,501 11 Golden ratio years
29 July 1990 6,574 18 Earth years
29 October 1990 6,666 6666 days
16 December 1990 6,714 13 Root-2 years
12 January 1991 6,741 30 Venus years
5 February 1991 6,765 20th Fibonacci number days
21 May 1991 6,870 10 Mars years
5 June 1991 6,885 6 Pi years
22 July 1991 6,932 20 Draconic years
29 July 1991 6,939 19 Earth years
3 August 1991 6,944 10,000,000 minutes
8 August 1991 6,949 7 e years
28 September 1991 7,000 7,000 days
4 November 1991 7,037 80 Mercury years
29 December 1991 7,092 12 Golden ratio years
15 May 1992 7,230 14 Root-2 years
29 July 1992 7,305 20 Earth years
7 April 1993 7,557 11 Mars years
28 June 1993 7,639 11,000,000 minutes
29 July 1993 7,670 21 Earth years
11 August 1993 7,683 13 Golden ratio years
28 August 1993 7,700 4 Cobalt 60 half-lives
14 October 1993 7,747 15 Root-2 years
13 November 1993 7,777 7777 days
1 April 1994 7,916 90 Mercury years
27 April 1994 7,942 8 e years
24 June 1994 8,000 8,000 days
26 July 1994 8,032 7 Pi years
29 July 1994 8,035 22 Earth years
30 October 1994 8,128 4th even-perfect-number days
31 December 1994 8,190 300 lunar orbits
15 February 1995 8,236 20 Full moon cycles
23 February 1995 8,244 12 Mars years
14 March 1995 8,263 16 Root-2 years
25 March 1995 8,274 14 Golden ratio years
23 May 1995 8,333 12,000,000 minutes
23 May 1995 8,333 200,000 hours
29 July 1995 8,400 23 Earth years
23 March 1996 8,638 1234 weeks
19 April 1996 8,665 2 Jupiter years
29 July 1996 8,766 24 Earth years
12 August 1996 8,780 17 Root-2 years
28 August 1996 8,796 100 Mercury years
5 November 1996 8,865 15 Golden ratio years
28 November 1996 8,888 8888 days
10 January 1997 8,931 13 Mars years
14 January 1997 8,935 9 e years
8 March 1997 8,988 40 Venus years
20 March 1997 9,000 9,000 days
24 March 1997 9,004 2 Hydrogen 3 (Tritium) half-lives
17 April 1997 9,028 13,000,000 minutes
29 July 1997 9,131 25 Earth years
15 September 1997 9,179 8 Pi years
10 January 1998 9,296 18 Root-2 years
19 June 1998 9,456 16 Golden ratio years
29 July 1998 9,496 26 Earth years
1 October 1998 9,560 2 Californium 250 half-lives
28 November 1998 9,618 14 Mars years
5 December 1998 9,625 5 Cobalt 60 half-lives
25 January 1999 9,676 110 Mercury years
12 March 1999 9,722 14,000,000 minutes
11 June 1999 9,813 19 Root-2 years
29 July 1999 9,861 27 Earth years
3 October 1999 9,927 10 e years
14 December 1999 9,999 9999 days
15 December 1999 10,000 10,000 days
31 January 2000 10,047 17 Golden ratio years
29 July 2000 10,227 28 Earth years
15 October 2000 10,305 15 Mars years
6 November 2000 10,327 9 Pi years
8 November 2000 10,329 20 Root-2 years
17 January 2001 10,399 30 Draconic years
4 February 2001 10,417 15,000,000 minutes
22 June 2001 10,555 120 Mercury years
29 July 2001 10,592 29 Earth years
13 September 2001 10,638 18 Golden ratio years
23 September 2001 10,648 1 Curium 243 half-lives
26 March 2002 10,832 1 Saturn year
9 April 2002 10,846 21 Root-2 years
22 June 2002 10,920 400 lunar orbits
22 June 2002 10,920 11 e years
18 July 2002 10,946 21st Fibonacci number days
29 July 2002 10,957 30 Earth years
2 September 2002 10,992 16 Mars years
10 September 2002 11,000 11,000 days
30 December 2002 11,111 11111 days
30 December 2002 11,111 16,000,000 minutes
27 April 2003 11,229 19 Golden ratio years
3 May 2003 11,235 50 Venus years
29 July 2003 11,322 31 Earth years
7 September 2003 11,362 22 Root-2 years
19 November 2003 11,435 130 Mercury years
28 December 2003 11,474 10 Pi years
13 March 2004 11,550 6 Cobalt 60 half-lives
6 April 2004 11,574 1 gigasecond
20 July 2004 11,679 17 Mars years
29 July 2004 11,688 32 Earth years
23 November 2004 11,805 17,000,000 minutes
7 December 2004 11,819 20 Golden ratio years
5 February 2005 11,879 23 Root-2 years
11 March 2005 11,913 12 e years
6 June 2005 12,000 12,000 days
29 July 2005 12,053 33 Earth years
16 April 2006 12,314 140 Mercury years
17 May 2006 12,345 12345 days
25 May 2006 12,353 30 Full moon cycles
7 June 2006 12,366 18 Mars years
6 July 2006 12,395 24 Root-2 years
21 July 2006 12,410 21 Golden ratio years
29 July 2006 12,418 34 Earth years
19 October 2006 12,500 18,000,000 minutes
19 October 2006 12,500 300,000 hours
18 February 2007 12,622 11 Pi years
20 July 2007 12,774 2,000 Pluto days
29 July 2007 12,783 35 Earth years
29 November 2007 12,906 13 e years
5 December 2007 12,912 25 Root-2 years
29 February 2008 12,998 3 Jupiter years
2 March 2008 13,000 13,000 days
3 March 2008 13,001 22 Golden ratio years
24 April 2008 13,053 19 Mars years
29 July 2008 13,149 36 Earth years
12 September 2008 13,194 19,000,000 minutes
12 September 2008 13,194 150 Mercury years
4 May 2009 13,428 26 Root-2 years
20 June 2009 13,475 7 Cobalt 60 half-lives
27 June 2009 13,482 60 Venus years
21 July 2009 13,506 3 Hydrogen 3 (Tritium) half-lives
29 July 2009 13,514 37 Earth years
15 October 2009 13,592 23 Golden ratio years
12 December 2009 13,650 500 lunar orbits
12 March 2010 13,740 20 Mars years
10 April 2010 13,769 12 Pi years
7 May 2010 13,796 1 reign of Henry VIII
15 July 2010 13,865 40 Draconic years
29 July 2010 13,879 38 Earth years
8 August 2010 13,889 20,000,000 minutes
17 August 2010 13,898 14 e years
3 October 2010 13,945 27 Root-2 years
27 November 2010 14,000 14,000 days
9 February 2011 14,074 160 Mercury years
29 May 2011 14,183 24 Golden ratio years
29 July 2011 14,244 39 Earth years
2 November 2011 14,340 3 Californium 250 half-lives
28 January 2012 14,427 21 Mars years
2 March 2012 14,461 28 Root-2 years
2 July 2012 14,583 21,000,000 minutes
29 July 2012 14,610 40 Earth years
9 January 2013 14,774 25 Golden ratio years
6 May 2013 14,891 15 e years
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