Mathaversaries

15th July, 1967

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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
15 July 2013 16,802 46 Earth years
28 September 2013 16,877 17 e years
29 January 2014 17,000 17,000 days
13 March 2014 17,043 33 Root-2 years
16 June 2014 17,138 29 Golden ratio years
15 July 2014 17,167 47 Earth years
23 July 2014 17,175 25 Mars years
28 August 2014 17,211 15 Pi years
20 December 2014 17,325 9 Cobalt 60 half-lives
26 December 2014 17,331 50 Draconic years
26 December 2014 17,331 4 Jupiter years
25 January 2015 17,361 25,000,000 minutes
15 July 2015 17,532 48 Earth years
12 August 2015 17,560 34 Root-2 years
13 September 2015 17,592 200 Mercury years
10 January 2016 17,711 22nd Fibonacci number days
28 January 2016 17,729 30 Golden ratio years
9 June 2016 17,862 26 Mars years
16 June 2016 17,869 18 e years
15 July 2016 17,898 49 Earth years
1 October 2016 17,976 80 Venus years
25 October 2016 18,000 18,000 days
2 November 2016 18,008 4 Hydrogen 3 (Tritium) half-lives
19 December 2016 18,055 26,000,000 minutes
9 January 2017 18,076 35 Root-2 years
15 July 2017 18,263 50 Earth years
10 September 2017 18,320 31 Golden ratio years
19 October 2017 18,359 16 Pi years
9 February 2018 18,472 210 Mercury years
27 April 2018 18,549 27 Mars years
10 June 2018 18,593 36 Root-2 years
15 July 2018 18,628 51 Earth years
14 November 2018 18,750 27,000,000 minutes
6 March 2019 18,862 19 e years
24 April 2019 18,911 32 Golden ratio years
15 July 2019 18,993 52 Earth years
22 July 2019 19,000 19,000 days
8 November 2019 19,109 37 Root-2 years
9 November 2019 19,110 700 lunar orbits
19 November 2019 19,120 4 Californium 250 half-lives
30 December 2019 19,161 3,000 Pluto days
14 March 2020 19,236 28 Mars years
28 March 2020 19,250 10 Cobalt 60 half-lives
7 July 2020 19,351 220 Mercury years
15 July 2020 19,359 53 Earth years
8 October 2020 19,444 28,000,000 minutes
5 December 2020 19,502 33 Golden ratio years
9 December 2020 19,506 17 Pi years
8 April 2021 19,626 38 Root-2 years
15 July 2021 19,724 54 Earth years
23 November 2021 19,855 20 e years
30 January 2022 19,923 29 Mars years
17 April 2022 20,000 20,000 days
15 July 2022 20,089 55 Earth years
19 July 2022 20,093 34 Golden ratio years
3 September 2022 20,139 29,000,000 minutes
6 September 2022 20,142 39 Root-2 years
26 November 2022 20,223 90 Venus years
4 December 2022 20,231 230 Mercury years
15 July 2023 20,454 56 Earth years
27 November 2023 20,589 50 Full moon cycles
18 December 2023 20,610 30 Mars years
31 January 2024 20,654 18 Pi years
5 February 2024 20,659 40 Root-2 years
1 March 2024 20,684 35 Golden ratio years
22 June 2024 20,797 60 Draconic years
15 July 2024 20,820 57 Earth years
28 July 2024 20,833 30,000,000 minutes
28 July 2024 20,833 500,000 hours
12 August 2024 20,848 21 e years
11 January 2025 21,000 21,000 days
1 May 2025 21,110 240 Mercury years
5 July 2025 21,175 41 Root-2 years
5 July 2025 21,175 11 Cobalt 60 half-lives
15 July 2025 21,185 58 Earth years
13 October 2025 21,275 36 Golden ratio years
3 November 2025 21,296 2 Curium 243 half-lives
4 November 2025 21,297 31 Mars years
23 June 2026 21,528 31,000,000 minutes
15 July 2026 21,550 59 Earth years
6 November 2026 21,664 5 Jupiter years
6 November 2026 21,664 2 Saturn years
3 December 2026 21,691 42 Root-2 years
23 March 2027 21,801 19 Pi years
1 May 2027 21,840 800 lunar orbits
1 May 2027 21,840 22 e years
27 May 2027 21,866 37 Golden ratio years
15 July 2027 21,915 60 Earth years
22 September 2027 21,984 32 Mars years
28 September 2027 21,990 250 Mercury years
8 October 2027 22,000 22,000 days
3 May 2028 22,208 43 Root-2 years
17 May 2028 22,222 22222 days
17 May 2028 22,222 32,000,000 minutes
15 July 2028 22,281 61 Earth years
7 January 2029 22,457 38 Golden ratio years
20 January 2029 22,470 100 Venus years
1 March 2029 22,510 5 Hydrogen 3 (Tritium) half-lives
15 July 2029 22,646 62 Earth years
9 August 2029 22,671 33 Mars years
1 October 2029 22,724 44 Root-2 years
18 January 2030 22,833 23 e years
24 February 2030 22,870 260 Mercury years
12 April 2030 22,917 33,000,000 minutes
14 May 2030 22,949 20 Pi years
4 July 2030 23,000 23,000 days
15 July 2030 23,011 63 Earth years
21 August 2030 23,048 39 Golden ratio years
12 October 2030 23,100 12 Cobalt 60 half-lives
29 November 2030 23,148 2 gigaseconds
15 February 2031 23,226 1 reign of Queen Victoria
27 June 2031 23,358 34 Mars years
15 July 2031 23,376 64 Earth years
6 March 2032 23,611 34,000,000 minutes
3 April 2032 23,639 40 Golden ratio years
15 July 2032 23,742 65 Earth years
22 July 2032 23,749 270 Mercury years
7 October 2032 23,826 24 e years
20 December 2032 23,900 5 Californium 250 half-lives
30 March 2033 24,000 24,000 days
14 May 2033 24,045 35 Mars years
4 July 2033 24,096 21 Pi years
15 July 2033 24,107 66 Earth years
15 November 2033 24,230 41 Golden ratio years
18 December 2033 24,263 70 Draconic years
29 January 2034 24,305 35,000,000 minutes
15 July 2034 24,472 67 Earth years
21 October 2034 24,570 900 lunar orbits
19 December 2034 24,629 280 Mercury years
7 March 2035 24,707 60 Full moon cycles
17 March 2035 24,717 110 Venus years
1 April 2035 24,732 36 Mars years
27 June 2035 24,819 25 e years
29 June 2035 24,821 42 Golden ratio years
15 July 2035 24,837 68 Earth years
25 December 2035 25,000 25,000 days
25 December 2035 25,000 36,000,000 minutes
25 December 2035 25,000 600,000 hours
19 January 2036 25,025 13 Cobalt 60 half-lives
15 July 2036 25,203 69 Earth years
25 August 2036 25,244 22 Pi years
9 February 2037 25,412 43 Golden ratio years
16 February 2037 25,419 37 Mars years
16 May 2037 25,508 290 Mercury years
25 June 2037 25,548 4,000 Pluto days
15 July 2037 25,568 70 Earth years
18 November 2037 25,694 37,000,000 minutes
15 March 2038 25,811 26 e years
15 July 2038 25,933 71 Earth years
16 September 2038 25,996 6 Jupiter years
20 September 2038 26,000 26,000 days
23 September 2038 26,003 44 Golden ratio years
4 January 2039 26,106 38 Mars years
15 July 2039 26,298 72 Earth years
13 October 2039 26,388 300 Mercury years
14 October 2039 26,389 38,000,000 minutes
16 October 2039 26,391 23 Pi years
15 July 2040 26,664 73 Earth years
21 November 2040 26,793 39 Mars years
2 December 2040 26,804 27 e years
27 April 2041 26,950 14 Cobalt 60 half-lives
11 May 2041 26,964 120 Venus years
16 June 2041 27,000 27,000 days
28 June 2041 27,012 6 Hydrogen 3 (Tritium) half-lives
15 July 2041 27,029 74 Earth years
7 September 2041 27,083 39,000,000 minutes
11 March 2042 27,268 310 Mercury years
12 April 2042 27,300 1,000 lunar orbits
15 July 2042 27,394 75 Earth years
9 October 2042 27,480 40 Mars years
6 December 2042 27,538 24 Pi years
29 January 2043 27,592 2 reigns of Henry VIII
16 June 2043 27,730 80 Draconic years
15 July 2043 27,759 76 Earth years
3 August 2043 27,778 40,000,000 minutes
22 August 2043 27,797 28 e years
12 March 2044 28,000 28,000 days
15 July 2044 28,125 77 Earth years
6 August 2044 28,147 320 Mercury years
26 August 2044 28,167 41 Mars years
27 June 2045 28,472 41,000,000 minutes
15 July 2045 28,490 78 Earth years
29 December 2045 28,657 23rd Fibonacci number days
21 January 2046 28,680 6 Californium 250 half-lives
27 January 2046 28,686 25 Pi years
11 May 2046 28,790 29 e years
15 June 2046 28,825 70 Full moon cycles
14 July 2046 28,854 42 Mars years
15 July 2046 28,855 79 Earth years
4 August 2046 28,875 15 Cobalt 60 half-lives
7 December 2046 29,000 29,000 days
3 January 2047 29,027 330 Mercury years
22 May 2047 29,166 42,000,000 minutes
23 May 2047 29,167 700,000 hours
6 July 2047 29,211 130 Venus years
15 July 2047 29,220 80 Earth years
31 May 2048 29,541 43 Mars years
15 July 2048 29,586 81 Earth years
27 January 2049 29,782 30 e years
19 March 2049 29,833 26 Pi years
16 April 2049 29,861 43,000,000 minutes
31 May 2049 29,906 340 Mercury years
15 July 2049 29,951 82 Earth years
2 September 2049 30,000 30,000 days
2 October 2049 30,030 1,100 lunar orbits
18 April 2050 30,228 44 Mars years
7 May 2050 30,247 4321 weeks
15 July 2050 30,316 83 Earth years
28 July 2050 30,329 7 Jupiter years
11 March 2051 30,555 44,000,000 minutes
15 July 2051 30,681 84 Earth years
17 October 2051 30,775 31 e years
28 October 2051 30,786 350 Mercury years
11 November 2051 30,800 16 Cobalt 60 half-lives
5 March 2052 30,915 45 Mars years
10 May 2052 30,981 27 Pi years
29 May 2052 31,000 31,000 days
15 July 2052 31,047 85 Earth years
11 December 2052 31,196 90 Draconic years
3 February 2053 31,250 45,000,000 minutes
15 July 2053 31,412 86 Earth years
30 August 2053 31,458 140 Venus years
25 October 2053 31,514 7 Hydrogen 3 (Tritium) half-lives
21 January 2054 31,602 46 Mars years
26 March 2054 31,666 360 Mercury years
6 July 2054 31,768 32 e years
15 July 2054 31,777 87 Earth years
20 December 2054 31,935 5,000 Pluto days
29 December 2054 31,944 46,000,000 minutes
29 December 2054 31,944 3 Curium 243 half-lives
23 February 2055 32,000 32,000 days
1 July 2055 32,128 28 Pi years
15 July 2055 32,142 88 Earth years
9 December 2055 32,289 47 Mars years
3 July 2056 32,496 3 Saturn years
15 July 2056 32,508 89 Earth years
21 August 2056 32,545 370 Mercury years
23 November 2056 32,639 47,000,000 minutes
17 February 2057 32,725 17 Cobalt 60 half-lives
24 March 2057 32,760 1,200 lunar orbits
25 March 2057 32,761 33 e years
15 July 2057 32,873 90 Earth years
22 September 2057 32,942 80 Full moon cycles
26 October 2057 32,976 48 Mars years
19 November 2057 33,000 33,000 days
15 July 2058 33,238 91 Earth years
22 August 2058 33,276 29 Pi years
18 October 2058 33,333 33333 days
18 October 2058 33,333 48,000,000 minutes
18 October 2058 33,333 800,000 hours
18 January 2059 33,425 380 Mercury years
22 February 2059 33,460 7 Californium 250 half-lives
15 July 2059 33,603 92 Earth years
13 September 2059 33,663 49 Mars years
25 October 2059 33,705 150 Venus years
12 December 2059 33,753 34 e years
15 July 2060 33,969 93 Earth years
15 August 2060 34,000 34,000 days
12 September 2060 34,028 49,000,000 minutes
15 June 2061 34,304 390 Mercury years
15 July 2061 34,334 94 Earth years
31 July 2061 34,350 50 Mars years
12 October 2061 34,423 30 Pi years
27 May 2062 34,650 18 Cobalt 60 half-lives
8 June 2062 34,662 100 Draconic years
8 June 2062 34,662 8 Jupiter years
15 July 2062 34,699 95 Earth years
7 August 2062 34,722 3 gigaseconds
7 August 2062 34,722 50,000,000 minutes
31 August 2062 34,746 35 e years
12 May 2063 35,000 35,000 days
18 June 2063 35,037 51 Mars years
15 July 2063 35,064 96 Earth years
12 November 2063 35,184 400 Mercury years
1 July 2064 35,416 51,000,000 minutes
15 July 2064 35,430 97 Earth years
13 September 2064 35,490 1,300 lunar orbits
2 December 2064 35,570 31 Pi years
5 May 2065 35,724 52 Mars years
20 May 2065 35,739 36 e years
15 July 2065 35,795 98 Earth years
19 December 2065 35,952 160 Venus years
5 February 2066 36,000 36,000 days
21 February 2066 36,016 8 Hydrogen 3 (Tritium) half-lives
10 April 2066 36,064 410 Mercury years
27 May 2066 36,111 52,000,000 minutes
15 July 2066 36,160 99 Earth years
23 March 2067 36,411 53 Mars years
15 July 2067 36,525 100 Earth years
3 September 2067 36,575 19 Cobalt 60 half-lives
24 January 2068 36,718 32 Pi years
7 February 2068 36,732 37 e years
20 April 2068 36,805 53,000,000 minutes
15 July 2068 36,891 101 Earth years
5 September 2068 36,943 420 Mercury years
1 November 2068 37,000 37,000 days
31 December 2068 37,060 90 Full moon cycles
7 February 2069 37,098 54 Mars years
15 July 2069 37,256 102 Earth years
16 March 2070 37,500 54,000,000 minutes
16 March 2070 37,500 900,000 hours
15 July 2070 37,621 103 Earth years
26 October 2070 37,724 38 e years
26 December 2070 37,785 55 Mars years
2 February 2071 37,823 430 Mercury years
16 March 2071 37,865 33 Pi years
15 July 2071 37,986 104 Earth years
29 July 2071 38,000 38,000 days
4 December 2071 38,128 110 Draconic years
8 February 2072 38,194 55,000,000 minutes
13 February 2072 38,199 170 Venus years
5 March 2072 38,220 1,400 lunar orbits
25 March 2072 38,240 8 Californium 250 half-lives
15 June 2072 38,322 6,000 Pluto days
15 July 2072 38,352 105 Earth years
12 November 2072 38,472 56 Mars years
10 December 2072 38,500 20 Cobalt 60 half-lives
30 June 2073 38,702 440 Mercury years
15 July 2073 38,717 39 e years
15 July 2073 38,717 106 Earth years
3 January 2074 38,889 56,000,000 minutes
18 April 2074 38,994 9 Jupiter years
24 April 2074 39,000 39,000 days
7 May 2074 39,013 34 Pi years
15 July 2074 39,082 107 Earth years
30 September 2074 39,159 57 Mars years
15 July 2075 39,447 108 Earth years
27 November 2075 39,582 450 Mercury years
28 November 2075 39,583 57,000,000 minutes
3 April 2076 39,710 40 e years
15 July 2076 39,813 109 Earth years
17 August 2076 39,846 58 Mars years
18 January 2077 40,000 40,000 days
27 June 2077 40,160 35 Pi years
15 July 2077 40,178 110 Earth years
23 October 2077 40,278 58,000,000 minutes
19 March 2078 40,425 21 Cobalt 60 half-lives
9 April 2078 40,446 180 Venus years
25 April 2078 40,462 460 Mercury years
20 June 2078 40,518 9 Hydrogen 3 (Tritium) half-lives
5 July 2078 40,533 59 Mars years
15 July 2078 40,543 111 Earth years
22 December 2078 40,703 41 e years
15 July 2079 40,908 112 Earth years
26 August 2079 40,950 1,500 lunar orbits
17 September 2079 40,972 59,000,000 minutes
15 October 2079 41,000 41,000 days
10 April 2080 41,178 100 Full moon cycles
22 May 2080 41,220 60 Mars years
15 July 2080 41,274 113 Earth years
18 August 2080 41,308 36 Pi years
20 September 2080 41,341 470 Mercury years
6 November 2080 41,388 3 reigns of Henry VIII
31 May 2081 41,594 120 Draconic years
15 July 2081 41,639 114 Earth years
11 August 2081 41,666 60,000,000 minutes
12 August 2081 41,667 1,000,000 hours
9 September 2081 41,695 42 e years
9 April 2082 41,907 61 Mars years
11 July 2082 42,000 42,000 days
15 July 2082 42,004 115 Earth years
17 February 2083 42,221 480 Mercury years
26 June 2083 42,350 22 Cobalt 60 half-lives
7 July 2083 42,361 61,000,000 minutes
15 July 2083 42,369 116 Earth years
9 October 2083 42,455 37 Pi years
23 February 2084 42,592 4 Curium 243 half-lives
25 February 2084 42,594 62 Mars years
29 May 2084 42,688 43 e years
3 June 2084 42,693 190 Venus years
15 July 2084 42,735 117 Earth years
6 April 2085 43,000 43,000 days
26 April 2085 43,020 9 Californium 250 half-lives
31 May 2085 43,055 62,000,000 minutes
15 July 2085 43,100 490 Mercury years
15 July 2085 43,100 118 Earth years
12 January 2086 43,281 63 Mars years
27 February 2086 43,327 10 Jupiter years
28 February 2086 43,328 4 Saturn years
15 July 2086 43,465 119 Earth years
29 November 2086 43,602 38 Pi years
15 February 2087 43,680 1,600 lunar orbits
16 February 2087 43,681 44 e years
26 April 2087 43,750 63,000,000 minutes
15 July 2087 43,830 120 Earth years
30 November 2087 43,968 64 Mars years
12 December 2087 43,980 500 Mercury years
1 January 2088 44,000 44,000 days
15 July 2088 44,196 121 Earth years
2 October 2088 44,275 23 Cobalt 60 half-lives
20 March 2089 44,444 44444 days
20 March 2089 44,444 64,000,000 minutes
15 July 2089 44,561 122 Earth years
17 October 2089 44,655 65 Mars years
10 December 2089 44,709 7,000 Pluto days
20 January 2090 44,750 39 Pi years
10 May 2090 44,860 510 Mercury years
15 July 2090 44,926 123 Earth years
29 July 2090 44,940 200 Venus years
27 September 2090 45,000 45,000 days
17 October 2090 45,020 10 Hydrogen 3 (Tritium) half-lives
27 November 2090 45,061 130 Draconic years
13 February 2091 45,139 65,000,000 minutes
15 July 2091 45,291 124 Earth years
20 July 2091 45,296 110 Full moon cycles
4 September 2091 45,342 66 Mars years
15 July 2092 45,657 125 Earth years
5 October 2092 45,739 520 Mercury years
7 January 2093 45,833 66,000,000 minutes
7 January 2093 45,833 1,100,000 hours
12 March 2093 45,897 40 Pi years
23 June 2093 46,000 46,000 days
15 July 2093 46,022 126 Earth years
22 July 2093 46,029 67 Mars years
9 January 2094 46,200 24 Cobalt 60 half-lives
15 April 2094 46,296 4 gigaseconds
26 June 2094 46,368 24th Fibonacci number days
15 July 2094 46,387 127 Earth years
7 August 2094 46,410 1,700 lunar orbits
18 September 2094 46,452 2 reigns of Queen Victoria
2 December 2094 46,527 67,000,000 minutes
4 March 2095 46,619 530 Mercury years
9 June 2095 46,716 68 Mars years
15 July 2095 46,752 128 Earth years
19 March 2096 47,000 47,000 days
3 May 2096 47,045 41 Pi years
15 July 2096 47,118 129 Earth years
22 September 2096 47,187 210 Venus years
27 October 2096 47,222 68,000,000 minutes
26 April 2097 47,403 69 Mars years
15 July 2097 47,483 130 Earth years
30 July 2097 47,498 540 Mercury years
8 January 2098 47,660 11 Jupiter years
28 May 2098 47,800 10 Californium 250 half-lives
15 July 2098 47,848 131 Earth years
21 September 2098 47,916 69,000,000 minutes
14 December 2098 48,000 48,000 days
14 March 2099 48,090 70 Mars years
18 April 2099 48,125 25 Cobalt 60 half-lives
24 June 2099 48,192 42 Pi years
15 July 2099 48,213 132 Earth years
27 December 2099 48,378 550 Mercury years
25 May 2100 48,527 140 Draconic years
15 July 2100 48,578 133 Earth years
17 August 2100 48,611 70,000,000 minutes
30 January 2101 48,777 71 Mars years
15 July 2101 48,943 134 Earth years
10 September 2101 49,000 49,000 days
28 January 2102 49,140 1,800 lunar orbits
26 May 2102 49,258 560 Mercury years
12 July 2102 49,305 71,000,000 minutes
15 July 2102 49,308 135 Earth years
16 August 2102 49,340 43 Pi years
29 October 2102 49,414 120 Full moon cycles
18 November 2102 49,434 220 Venus years
18 December 2102 49,464 72 Mars years
14 February 2103 49,522 11 Hydrogen 3 (Tritium) half-lives
15 July 2103 49,673 136 Earth years
6 June 2104 50,000 50,000 days
6 June 2104 50,000 72,000,000 minutes
6 June 2104 50,000 1,200,000 hours
End of time ∞ Infinity-versary

Hide Planets   |   Hide Constants   |   Hide Half-Lives

DateDaysEvent
16 July 1967 1 One day
21 July 1967 6 1st even-perfect-number days
22 July 1967 7 One week
11 August 1967 27 1 lunar orbit
12 August 1967 28 2nd even-perfect-number days
15 August 1967 31 One month
26 August 1967 42 Life-universe-and-everything
8 September 1967 55 10th Fibonacci number days
22 September 1967 69 Naughty-versary
23 September 1967 70 Smallest-weird-number days
12 October 1967 89 11th Fibonacci number days
23 October 1967 100 100 days
15 November 1967 123 123 days
6 December 1967 144 12th Fibonacci number days
31 January 1968 200 200 days
4 March 1968 233 13th Fibonacci number days
13 April 1968 273 10 lunar orbits
10 May 1968 300 300 days
10 May 1968 300 Sparta!
31 May 1968 321 321 days
15 July 1968 366 1 Earth year
26 July 1968 377 14th Fibonacci number days
18 August 1968 400 400 days
22 August 1968 404 Anniversary Not Found
22 November 1968 496 3rd even-perfect-number days
26 November 1968 500 500 days
29 November 1968 503 Anniversary Forbidden
12 December 1968 516 1 Root-2 years
25 February 1969 591 1 Golden ratio years
6 March 1969 600 600 days
16 March 1969 610 15th Fibonacci number days
11 May 1969 666 Lucifersary
1 June 1969 687 1 Mars year
8 June 1969 694 1,000,000 minutes
14 June 1969 700 700 days
15 July 1969 731 2 Earth years
15 August 1969 762 Feynman-point days
22 September 1969 800 800 days
22 November 1969 861 123 weeks
11 December 1969 880 10 Mercury years
31 December 1969 900 900 days
28 March 1970 987 16th Fibonacci number days
3 April 1970 993 1 e years
10 April 1970 1,000 1,000 days
13 May 1970 1,033 2 Root-2 years
15 July 1970 1,096 3 Earth years
30 July 1970 1,111 1111 days
4 September 1970 1,147 1 Pi years
9 October 1970 1,182 2 Golden ratio years
7 November 1970 1,211 4th look-and-say number days
30 November 1970 1,234 1234 days
13 March 1971 1,337 1337 days
10 April 1971 1,365 50 lunar orbits
19 April 1971 1,374 2 Mars years
4 May 1971 1,389 2,000,000 minutes
15 July 1971 1,461 4 Earth years
11 October 1971 1,549 3 Root-2 years
28 November 1971 1,597 17th Fibonacci number days
8 April 1972 1,729 Hardy-Ramanujan-number days
8 May 1972 1,759 20 Mercury years
22 May 1972 1,773 3 Golden ratio years
15 July 1972 1,827 5 Earth years
21 October 1972 1,925 1 Cobalt 60 half-lives
20 December 1972 1,985 2 e years
22 December 1972 1,987 300th prime number (1987) days
4 January 1973 2,000 2,000 days
6 March 1973 2,061 3 Mars years
11 March 1973 2,066 4 Root-2 years
28 March 1973 2,083 3,000,000 minutes
15 July 1973 2,192 6 Earth years
14 August 1973 2,222 2222 days
8 September 1973 2,247 321 weeks
8 September 1973 2,247 10 Venus years
26 October 1973 2,295 2 Pi years
11 November 1973 2,311 5th Euclid-prime days
3 January 1974 2,364 4 Golden ratio years
15 July 1974 2,557 7 Earth years
9 August 1974 2,582 5 Root-2 years
11 August 1974 2,584 18th Fibonacci number days
5 October 1974 2,639 30 Mercury years
4 January 1975 2,730 100 lunar orbits
22 January 1975 2,748 4 Mars years
21 February 1975 2,778 4,000,000 minutes
15 July 1975 2,922 8 Earth years
17 August 1975 2,955 5 Golden ratio years
9 September 1975 2,978 3 e years
1 October 1975 3,000 3,000 days
8 January 1976 3,099 6 Root-2 years
11 April 1976 3,193 500 Pluto days
15 July 1976 3,288 9 Earth years
29 August 1976 3,333 3333 days
9 December 1976 3,435 5 Mars years
16 December 1976 3,442 3 Pi years
9 January 1977 3,466 10 Draconic years
15 January 1977 3,472 5,000,000 minutes
2 March 1977 3,518 40 Mercury years
30 March 1977 3,546 6 Golden ratio years
7 June 1977 3,615 7 Root-2 years
15 July 1977 3,653 10 Earth years
28 January 1978 3,850 2 Cobalt 60 half-lives
29 May 1978 3,971 4 e years
27 June 1978 4,000 4,000 days
15 July 1978 4,018 11 Earth years
9 October 1978 4,104 Second-positive-integer-which-can-be-expressed-as-the-sum-of-two-positive-cubes-in-two-different-ways days
23 October 1978 4,118 10 Full moon cycles
27 October 1978 4,122 6 Mars years
6 November 1978 4,132 8 Root-2 years
11 November 1978 4,137 7 Golden ratio years
11 December 1978 4,167 6,000,000 minutes
11 December 1978 4,167 100,000 hours
25 December 1978 4,181 19th Fibonacci number days
14 May 1979 4,321 4321 days
26 May 1979 4,333 1 Jupiter year
15 July 1979 4,383 12 Earth years
30 July 1979 4,398 50 Mercury years
14 September 1979 4,444 4444 days
3 November 1979 4,494 20 Venus years
11 November 1979 4,502 1 Hydrogen 3 (Tritium) half-lives
7 February 1980 4,590 4 Pi years
5 April 1980 4,648 9 Root-2 years
24 June 1980 4,728 8 Golden ratio years
15 July 1980 4,749 13 Earth years
15 August 1980 4,780 1 Californium 250 half-lives
13 September 1980 4,809 7 Mars years
4 November 1980 4,861 7,000,000 minutes
15 February 1981 4,964 5 e years
23 March 1981 5,000 5,000 days
2 May 1981 5,040 8th colossally-abundant-number days
15 July 1981 5,114 14 Earth years
4 September 1981 5,165 10 Root-2 years
26 December 1981 5,278 60 Mercury years
5 February 1982 5,319 9 Golden ratio years
26 June 1982 5,460 200 lunar orbits
15 July 1982 5,479 15 Earth years
1 August 1982 5,496 8 Mars years
29 September 1982 5,555 5555 days
30 September 1982 5,556 8,000,000 minutes
2 February 1983 5,681 11 Root-2 years
30 March 1983 5,737 5 Pi years
7 May 1983 5,775 3 Cobalt 60 half-lives
15 July 1983 5,844 16 Earth years
19 September 1983 5,910 10 Golden ratio years
4 November 1983 5,956 6 e years
18 December 1983 6,000 6,000 days
23 May 1984 6,157 70 Mercury years
9 June 1984 6,174 Kaprekar's-constant days
18 June 1984 6,183 9 Mars years
3 July 1984 6,198 12 Root-2 years
15 July 1984 6,210 17 Earth years
24 August 1984 6,250 9,000,000 minutes
8 January 1985 6,387 1,000 Pluto days
2 May 1985 6,501 11 Golden ratio years
15 July 1985 6,575 18 Earth years
14 October 1985 6,666 6666 days
1 December 1985 6,714 13 Root-2 years
28 December 1985 6,741 30 Venus years
21 January 1986 6,765 20th Fibonacci number days
6 May 1986 6,870 10 Mars years
21 May 1986 6,885 6 Pi years
7 July 1986 6,932 20 Draconic years
15 July 1986 6,940 19 Earth years
19 July 1986 6,944 10,000,000 minutes
24 July 1986 6,949 7 e years
13 September 1986 7,000 7,000 days
20 October 1986 7,037 80 Mercury years
14 December 1986 7,092 12 Golden ratio years
1 May 1987 7,230 14 Root-2 years
15 July 1987 7,305 20 Earth years
23 March 1988 7,557 11 Mars years
13 June 1988 7,639 11,000,000 minutes
15 July 1988 7,671 21 Earth years
27 July 1988 7,683 13 Golden ratio years
13 August 1988 7,700 4 Cobalt 60 half-lives
29 September 1988 7,747 15 Root-2 years
29 October 1988 7,777 7777 days
17 March 1989 7,916 90 Mercury years
12 April 1989 7,942 8 e years
9 June 1989 8,000 8,000 days
11 July 1989 8,032 7 Pi years
15 July 1989 8,036 22 Earth years
15 October 1989 8,128 4th even-perfect-number days
16 December 1989 8,190 300 lunar orbits
31 January 1990 8,236 20 Full moon cycles
8 February 1990 8,244 12 Mars years
27 February 1990 8,263 16 Root-2 years
10 March 1990 8,274 14 Golden ratio years
8 May 1990 8,333 12,000,000 minutes
8 May 1990 8,333 200,000 hours
15 July 1990 8,401 23 Earth years
9 March 1991 8,638 1234 weeks
5 April 1991 8,665 2 Jupiter years
15 July 1991 8,766 24 Earth years
29 July 1991 8,780 17 Root-2 years
14 August 1991 8,796 100 Mercury years
22 October 1991 8,865 15 Golden ratio years
14 November 1991 8,888 8888 days
27 December 1991 8,931 13 Mars years
31 December 1991 8,935 9 e years
22 February 1992 8,988 40 Venus years
5 March 1992 9,000 9,000 days
9 March 1992 9,004 2 Hydrogen 3 (Tritium) half-lives
2 April 1992 9,028 13,000,000 minutes
15 July 1992 9,132 25 Earth years
31 August 1992 9,179 8 Pi years
26 December 1992 9,296 18 Root-2 years
4 June 1993 9,456 16 Golden ratio years
15 July 1993 9,497 26 Earth years
16 September 1993 9,560 2 Californium 250 half-lives
13 November 1993 9,618 14 Mars years
20 November 1993 9,625 5 Cobalt 60 half-lives
10 January 1994 9,676 110 Mercury years
25 February 1994 9,722 14,000,000 minutes
27 May 1994 9,813 19 Root-2 years
15 July 1994 9,862 27 Earth years
18 September 1994 9,927 10 e years
29 November 1994 9,999 9999 days
30 November 1994 10,000 10,000 days
16 January 1995 10,047 17 Golden ratio years
15 July 1995 10,227 28 Earth years
1 October 1995 10,305 15 Mars years
23 October 1995 10,327 9 Pi years
25 October 1995 10,329 20 Root-2 years
3 January 1996 10,399 30 Draconic years
21 January 1996 10,417 15,000,000 minutes
7 June 1996 10,555 120 Mercury years
15 July 1996 10,593 29 Earth years
29 August 1996 10,638 18 Golden ratio years
8 September 1996 10,648 1 Curium 243 half-lives
11 March 1997 10,832 1 Saturn year
25 March 1997 10,846 21 Root-2 years
7 June 1997 10,920 400 lunar orbits
7 June 1997 10,920 11 e years
3 July 1997 10,946 21st Fibonacci number days
15 July 1997 10,958 30 Earth years
18 August 1997 10,992 16 Mars years
26 August 1997 11,000 11,000 days
15 December 1997 11,111 11111 days
15 December 1997 11,111 16,000,000 minutes
12 April 1998 11,229 19 Golden ratio years
18 April 1998 11,235 50 Venus years
15 July 1998 11,323 31 Earth years
23 August 1998 11,362 22 Root-2 years
4 November 1998 11,435 130 Mercury years
13 December 1998 11,474 10 Pi years
27 February 1999 11,550 6 Cobalt 60 half-lives
23 March 1999 11,574 1 gigasecond
6 July 1999 11,679 17 Mars years
15 July 1999 11,688 32 Earth years
9 November 1999 11,805 17,000,000 minutes
23 November 1999 11,819 20 Golden ratio years
22 January 2000 11,879 23 Root-2 years
25 February 2000 11,913 12 e years
22 May 2000 12,000 12,000 days
15 July 2000 12,054 33 Earth years
1 April 2001 12,314 140 Mercury years
2 May 2001 12,345 12345 days
10 May 2001 12,353 30 Full moon cycles
23 May 2001 12,366 18 Mars years
21 June 2001 12,395 24 Root-2 years
6 July 2001 12,410 21 Golden ratio years
15 July 2001 12,419 34 Earth years
4 October 2001 12,500 18,000,000 minutes
4 October 2001 12,500 300,000 hours
3 February 2002 12,622 11 Pi years
5 July 2002 12,774 2,000 Pluto days
15 July 2002 12,784 35 Earth years
14 November 2002 12,906 13 e years
20 November 2002 12,912 25 Root-2 years
14 February 2003 12,998 3 Jupiter years
16 February 2003 13,000 13,000 days
17 February 2003 13,001 22 Golden ratio years
10 April 2003 13,053 19 Mars years
15 July 2003 13,149 36 Earth years
29 August 2003 13,194 19,000,000 minutes
29 August 2003 13,194 150 Mercury years
19 April 2004 13,428 26 Root-2 years
5 June 2004 13,475 7 Cobalt 60 half-lives
12 June 2004 13,482 60 Venus years
6 July 2004 13,506 3 Hydrogen 3 (Tritium) half-lives
15 July 2004 13,515 37 Earth years
30 September 2004 13,592 23 Golden ratio years
27 November 2004 13,650 500 lunar orbits
25 February 2005 13,740 20 Mars years
26 March 2005 13,769 12 Pi years
22 April 2005 13,796 1 reign of Henry VIII
30 June 2005 13,865 40 Draconic years
15 July 2005 13,880 38 Earth years
24 July 2005 13,889 20,000,000 minutes
2 August 2005 13,898 14 e years
18 September 2005 13,945 27 Root-2 years
12 November 2005 14,000 14,000 days
25 January 2006 14,074 160 Mercury years
14 May 2006 14,183 24 Golden ratio years
15 July 2006 14,245 39 Earth years
18 October 2006 14,340 3 Californium 250 half-lives
13 January 2007 14,427 21 Mars years
16 February 2007 14,461 28 Root-2 years
18 June 2007 14,583 21,000,000 minutes
15 July 2007 14,610 40 Earth years
26 December 2007 14,774 25 Golden ratio years
21 April 2008 14,891 15 e years
17 May 2008 14,917 13 Pi years
22 June 2008 14,953 170 Mercury years
15 July 2008 14,976 41 Earth years
16 July 2008 14,977 29 Root-2 years
8 August 2008 15,000 15,000 days
30 November 2008 15,114 22 Mars years
13 May 2009 15,278 22,000,000 minutes
15 July 2009 15,341 42 Earth years
8 August 2009 15,365 26 Golden ratio years
12 September 2009 15,400 8 Cobalt 60 half-lives
15 December 2009 15,494 30 Root-2 years
15 July 2010 15,706 43 Earth years
7 August 2010 15,729 70 Venus years
18 October 2010 15,801 23 Mars years
19 November 2010 15,833 180 Mercury years
9 January 2011 15,884 16 e years
22 March 2011 15,956 27 Golden ratio years
7 April 2011 15,972 23,000,000 minutes
5 May 2011 16,000 16,000 days
15 May 2011 16,010 31 Root-2 years
8 July 2011 16,064 14 Pi years
15 July 2011 16,071 44 Earth years
19 May 2012 16,380 600 lunar orbits
15 July 2012 16,437 45 Earth years
18 August 2012 16,471 40 Full moon cycles
4 September 2012 16,488 24 Mars years
13 October 2012 16,527 32 Root-2 years
2 November 2012 16,547 28 Golden ratio years
2 March 2013 16,667 24,000,000 minutes
2 March 2013 16,667 400,000 hours
16 April 2013 16,712 190 Mercury years
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