Mathaversaries

30th September, 1929

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What is this?

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

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

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

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DateDaysEvent
27 May 2013 30,555 44,000,000 minutes
30 September 2013 30,681 84 Earth years
2 January 2014 30,775 31 e years
13 January 2014 30,786 350 Mercury years
27 January 2014 30,800 16 Cobalt 60 half-lives
22 May 2014 30,915 45 Mars years
27 July 2014 30,981 27 Pi years
15 August 2014 31,000 31,000 days
30 September 2014 31,046 85 Earth years
27 February 2015 31,196 90 Draconic years
22 April 2015 31,250 45,000,000 minutes
30 September 2015 31,411 86 Earth years
16 November 2015 31,458 140 Venus years
11 January 2016 31,514 7 Hydrogen 3 (Tritium) half-lives
8 April 2016 31,602 46 Mars years
11 June 2016 31,666 360 Mercury years
21 September 2016 31,768 32 e years
30 September 2016 31,777 87 Earth years
7 March 2017 31,935 5,000 Pluto days
16 March 2017 31,944 46,000,000 minutes
16 March 2017 31,944 3 Curium 243 half-lives
11 May 2017 32,000 32,000 days
16 September 2017 32,128 28 Pi years
30 September 2017 32,142 88 Earth years
24 February 2018 32,289 47 Mars years
19 September 2018 32,496 3 Saturn years
30 September 2018 32,507 89 Earth years
7 November 2018 32,545 370 Mercury years
9 February 2019 32,639 47,000,000 minutes
6 May 2019 32,725 17 Cobalt 60 half-lives
10 June 2019 32,760 1,200 lunar orbits
11 June 2019 32,761 33 e years
30 September 2019 32,872 90 Earth years
9 December 2019 32,942 80 Full moon cycles
12 January 2020 32,976 48 Mars years
5 February 2020 33,000 33,000 days
30 September 2020 33,238 91 Earth years
7 November 2020 33,276 29 Pi years
3 January 2021 33,333 33333 days
3 January 2021 33,333 48,000,000 minutes
3 January 2021 33,333 800,000 hours
5 April 2021 33,425 380 Mercury years
10 May 2021 33,460 7 Californium 250 half-lives
30 September 2021 33,603 92 Earth years
29 November 2021 33,663 49 Mars years
10 January 2022 33,705 150 Venus years
27 February 2022 33,753 34 e years
30 September 2022 33,968 93 Earth years
1 November 2022 34,000 34,000 days
29 November 2022 34,028 49,000,000 minutes
1 September 2023 34,304 390 Mercury years
30 September 2023 34,333 94 Earth years
17 October 2023 34,350 50 Mars years
29 December 2023 34,423 30 Pi years
12 August 2024 34,650 18 Cobalt 60 half-lives
24 August 2024 34,662 100 Draconic years
24 August 2024 34,662 8 Jupiter years
30 September 2024 34,699 95 Earth years
23 October 2024 34,722 3 gigaseconds
23 October 2024 34,722 50,000,000 minutes
16 November 2024 34,746 35 e years
28 July 2025 35,000 35,000 days
3 September 2025 35,037 51 Mars years
30 September 2025 35,064 96 Earth years
28 January 2026 35,184 400 Mercury years
17 September 2026 35,416 51,000,000 minutes
30 September 2026 35,429 97 Earth years
30 November 2026 35,490 1,300 lunar orbits
18 February 2027 35,570 31 Pi years
22 July 2027 35,724 52 Mars years
6 August 2027 35,739 36 e years
30 September 2027 35,794 98 Earth years
6 March 2028 35,952 160 Venus years
23 April 2028 36,000 36,000 days
9 May 2028 36,016 8 Hydrogen 3 (Tritium) half-lives
26 June 2028 36,064 410 Mercury years
12 August 2028 36,111 52,000,000 minutes
30 September 2028 36,160 99 Earth years
8 June 2029 36,411 53 Mars years
30 September 2029 36,525 100 Earth years
19 November 2029 36,575 19 Cobalt 60 half-lives
11 April 2030 36,718 32 Pi years
25 April 2030 36,732 37 e years
7 July 2030 36,805 53,000,000 minutes
30 September 2030 36,890 101 Earth years
22 November 2030 36,943 420 Mercury years
18 January 2031 37,000 37,000 days
19 March 2031 37,060 90 Full moon cycles
26 April 2031 37,098 54 Mars years
30 September 2031 37,255 102 Earth years
1 June 2032 37,500 54,000,000 minutes
1 June 2032 37,500 900,000 hours
30 September 2032 37,621 103 Earth years
11 January 2033 37,724 38 e years
13 March 2033 37,785 55 Mars years
20 April 2033 37,823 430 Mercury years
1 June 2033 37,865 33 Pi years
30 September 2033 37,986 104 Earth years
14 October 2033 38,000 38,000 days
19 February 2034 38,128 110 Draconic years
26 April 2034 38,194 55,000,000 minutes
1 May 2034 38,199 170 Venus years
22 May 2034 38,220 1,400 lunar orbits
11 June 2034 38,240 8 Californium 250 half-lives
1 September 2034 38,322 6,000 Pluto days
30 September 2034 38,351 105 Earth years
29 January 2035 38,472 56 Mars years
26 February 2035 38,500 20 Cobalt 60 half-lives
16 September 2035 38,702 440 Mercury years
30 September 2035 38,716 106 Earth years
1 October 2035 38,717 39 e years
21 March 2036 38,889 56,000,000 minutes
4 July 2036 38,994 9 Jupiter years
10 July 2036 39,000 39,000 days
23 July 2036 39,013 34 Pi years
30 September 2036 39,082 107 Earth years
16 December 2036 39,159 57 Mars years
30 September 2037 39,447 108 Earth years
12 February 2038 39,582 450 Mercury years
13 February 2038 39,583 57,000,000 minutes
20 June 2038 39,710 40 e years
30 September 2038 39,812 109 Earth years
3 November 2038 39,846 58 Mars years
6 April 2039 40,000 40,000 days
13 September 2039 40,160 35 Pi years
30 September 2039 40,177 110 Earth years
9 January 2040 40,278 58,000,000 minutes
4 June 2040 40,425 21 Cobalt 60 half-lives
25 June 2040 40,446 180 Venus years
11 July 2040 40,462 460 Mercury years
5 September 2040 40,518 9 Hydrogen 3 (Tritium) half-lives
20 September 2040 40,533 59 Mars years
30 September 2040 40,543 111 Earth years
9 March 2041 40,703 41 e years
30 September 2041 40,908 112 Earth years
11 November 2041 40,950 1,500 lunar orbits
3 December 2041 40,972 59,000,000 minutes
31 December 2041 41,000 41,000 days
27 June 2042 41,178 100 Full moon cycles
8 August 2042 41,220 60 Mars years
30 September 2042 41,273 113 Earth years
4 November 2042 41,308 36 Pi years
7 December 2042 41,341 470 Mercury years
23 January 2043 41,388 3 reigns of Henry VIII
17 August 2043 41,594 120 Draconic years
30 September 2043 41,638 114 Earth years
28 October 2043 41,666 60,000,000 minutes
29 October 2043 41,667 1,000,000 hours
26 November 2043 41,695 42 e years
25 June 2044 41,907 61 Mars years
26 September 2044 42,000 42,000 days
30 September 2044 42,004 115 Earth years
5 May 2045 42,221 480 Mercury years
11 September 2045 42,350 22 Cobalt 60 half-lives
22 September 2045 42,361 61,000,000 minutes
30 September 2045 42,369 116 Earth years
25 December 2045 42,455 37 Pi years
11 May 2046 42,592 4 Curium 243 half-lives
13 May 2046 42,594 62 Mars years
15 August 2046 42,688 43 e years
20 August 2046 42,693 190 Venus years
30 September 2046 42,734 117 Earth years
23 June 2047 43,000 43,000 days
13 July 2047 43,020 9 Californium 250 half-lives
17 August 2047 43,055 62,000,000 minutes
30 September 2047 43,099 118 Earth years
1 October 2047 43,100 490 Mercury years
30 March 2048 43,281 63 Mars years
15 May 2048 43,327 10 Jupiter years
16 May 2048 43,328 4 Saturn years
30 September 2048 43,465 119 Earth years
14 February 2049 43,602 38 Pi years
3 May 2049 43,680 1,600 lunar orbits
4 May 2049 43,681 44 e years
12 July 2049 43,750 63,000,000 minutes
30 September 2049 43,830 120 Earth years
15 February 2050 43,968 64 Mars years
27 February 2050 43,980 500 Mercury years
19 March 2050 44,000 44,000 days
30 September 2050 44,195 121 Earth years
19 December 2050 44,275 23 Cobalt 60 half-lives
6 June 2051 44,444 44444 days
6 June 2051 44,444 64,000,000 minutes
30 September 2051 44,560 122 Earth years
3 January 2052 44,655 65 Mars years
26 February 2052 44,709 7,000 Pluto days
7 April 2052 44,750 39 Pi years
26 July 2052 44,860 510 Mercury years
30 September 2052 44,926 123 Earth years
14 October 2052 44,940 200 Venus years
13 December 2052 45,000 45,000 days
2 January 2053 45,020 10 Hydrogen 3 (Tritium) half-lives
12 February 2053 45,061 130 Draconic years
1 May 2053 45,139 65,000,000 minutes
30 September 2053 45,291 124 Earth years
5 October 2053 45,296 110 Full moon cycles
20 November 2053 45,342 66 Mars years
30 September 2054 45,656 125 Earth years
22 December 2054 45,739 520 Mercury years
26 March 2055 45,833 66,000,000 minutes
26 March 2055 45,833 1,100,000 hours
29 May 2055 45,897 40 Pi years
9 September 2055 46,000 46,000 days
30 September 2055 46,021 126 Earth years
8 October 2055 46,029 67 Mars years
27 March 2056 46,200 24 Cobalt 60 half-lives
1 July 2056 46,296 4 gigaseconds
11 September 2056 46,368 24th Fibonacci number days
30 September 2056 46,387 127 Earth years
23 October 2056 46,410 1,700 lunar orbits
4 December 2056 46,452 2 reigns of Queen Victoria
17 February 2057 46,527 67,000,000 minutes
20 May 2057 46,619 530 Mercury years
25 August 2057 46,716 68 Mars years
30 September 2057 46,752 128 Earth years
5 June 2058 47,000 47,000 days
20 July 2058 47,045 41 Pi years
30 September 2058 47,117 129 Earth years
9 December 2058 47,187 210 Venus years
13 January 2059 47,222 68,000,000 minutes
13 July 2059 47,403 69 Mars years
30 September 2059 47,482 130 Earth years
16 October 2059 47,498 540 Mercury years
26 March 2060 47,660 11 Jupiter years
13 August 2060 47,800 10 Californium 250 half-lives
30 September 2060 47,848 131 Earth years
7 December 2060 47,916 69,000,000 minutes
1 March 2061 48,000 48,000 days
30 May 2061 48,090 70 Mars years
4 July 2061 48,125 25 Cobalt 60 half-lives
9 September 2061 48,192 42 Pi years
30 September 2061 48,213 132 Earth years
14 March 2062 48,378 550 Mercury years
10 August 2062 48,527 140 Draconic years
30 September 2062 48,578 133 Earth years
2 November 2062 48,611 70,000,000 minutes
17 April 2063 48,777 71 Mars years
30 September 2063 48,943 134 Earth years
26 November 2063 49,000 49,000 days
14 April 2064 49,140 1,800 lunar orbits
10 August 2064 49,258 560 Mercury years
26 September 2064 49,305 71,000,000 minutes
30 September 2064 49,309 135 Earth years
31 October 2064 49,340 43 Pi years
13 January 2065 49,414 120 Full moon cycles
2 February 2065 49,434 220 Venus years
4 March 2065 49,464 72 Mars years
1 May 2065 49,522 11 Hydrogen 3 (Tritium) half-lives
30 September 2065 49,674 136 Earth years
22 August 2066 50,000 50,000 days
22 August 2066 50,000 72,000,000 minutes
22 August 2066 50,000 1,200,000 hours
End of time ∞ Infinity-versary

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DateDaysEvent
1 October 1929 1 One day
6 October 1929 6 1st even-perfect-number days
7 October 1929 7 One week
27 October 1929 27 1 lunar orbit
28 October 1929 28 2nd even-perfect-number days
30 October 1929 30 One month
11 November 1929 42 Life-universe-and-everything
24 November 1929 55 10th Fibonacci number days
8 December 1929 69 Naughty-versary
9 December 1929 70 Smallest-weird-number days
28 December 1929 89 11th Fibonacci number days
8 January 1930 100 100 days
31 January 1930 123 123 days
21 February 1930 144 12th Fibonacci number days
18 April 1930 200 200 days
21 May 1930 233 13th Fibonacci number days
30 June 1930 273 10 lunar orbits
27 July 1930 300 300 days
27 July 1930 300 Sparta!
17 August 1930 321 321 days
30 September 1930 365 1 Earth year
12 October 1930 377 14th Fibonacci number days
4 November 1930 400 400 days
8 November 1930 404 Anniversary Not Found
8 February 1931 496 3rd even-perfect-number days
12 February 1931 500 500 days
15 February 1931 503 Anniversary Forbidden
28 February 1931 516 1 Root-2 years
14 May 1931 591 1 Golden ratio years
23 May 1931 600 600 days
2 June 1931 610 15th Fibonacci number days
28 July 1931 666 Lucifersary
18 August 1931 687 1 Mars year
25 August 1931 694 1,000,000 minutes
31 August 1931 700 700 days
30 September 1931 730 2 Earth years
1 November 1931 762 Feynman-point days
9 December 1931 800 800 days
8 February 1932 861 123 weeks
27 February 1932 880 10 Mercury years
18 March 1932 900 900 days
13 June 1932 987 16th Fibonacci number days
19 June 1932 993 1 e years
26 June 1932 1,000 1,000 days
29 July 1932 1,033 2 Root-2 years
30 September 1932 1,096 3 Earth years
15 October 1932 1,111 1111 days
20 November 1932 1,147 1 Pi years
25 December 1932 1,182 2 Golden ratio years
23 January 1933 1,211 4th look-and-say number days
15 February 1933 1,234 1234 days
29 May 1933 1,337 1337 days
26 June 1933 1,365 50 lunar orbits
5 July 1933 1,374 2 Mars years
20 July 1933 1,389 2,000,000 minutes
30 September 1933 1,461 4 Earth years
27 December 1933 1,549 3 Root-2 years
13 February 1934 1,597 17th Fibonacci number days
25 June 1934 1,729 Hardy-Ramanujan-number days
25 July 1934 1,759 20 Mercury years
8 August 1934 1,773 3 Golden ratio years
30 September 1934 1,826 5 Earth years
7 January 1935 1,925 1 Cobalt 60 half-lives
8 March 1935 1,985 2 e years
10 March 1935 1,987 300th prime number (1987) days
23 March 1935 2,000 2,000 days
23 May 1935 2,061 3 Mars years
28 May 1935 2,066 4 Root-2 years
14 June 1935 2,083 3,000,000 minutes
30 September 1935 2,191 6 Earth years
31 October 1935 2,222 2222 days
25 November 1935 2,247 321 weeks
25 November 1935 2,247 10 Venus years
12 January 1936 2,295 2 Pi years
28 January 1936 2,311 5th Euclid-prime days
21 March 1936 2,364 4 Golden ratio years
30 September 1936 2,557 7 Earth years
25 October 1936 2,582 5 Root-2 years
27 October 1936 2,584 18th Fibonacci number days
21 December 1936 2,639 30 Mercury years
22 March 1937 2,730 100 lunar orbits
9 April 1937 2,748 4 Mars years
9 May 1937 2,778 4,000,000 minutes
30 September 1937 2,922 8 Earth years
2 November 1937 2,955 5 Golden ratio years
25 November 1937 2,978 3 e years
17 December 1937 3,000 3,000 days
26 March 1938 3,099 6 Root-2 years
28 June 1938 3,193 500 Pluto days
30 September 1938 3,287 9 Earth years
15 November 1938 3,333 3333 days
25 February 1939 3,435 5 Mars years
4 March 1939 3,442 3 Pi years
28 March 1939 3,466 10 Draconic years
3 April 1939 3,472 5,000,000 minutes
19 May 1939 3,518 40 Mercury years
16 June 1939 3,546 6 Golden ratio years
24 August 1939 3,615 7 Root-2 years
30 September 1939 3,652 10 Earth years
15 April 1940 3,850 2 Cobalt 60 half-lives
14 August 1940 3,971 4 e years
12 September 1940 4,000 4,000 days
30 September 1940 4,018 11 Earth years
25 December 1940 4,104 Second-positive-integer-which-can-be-expressed-as-the-sum-of-two-positive-cubes-in-two-different-ways days
8 January 1941 4,118 10 Full moon cycles
12 January 1941 4,122 6 Mars years
22 January 1941 4,132 8 Root-2 years
27 January 1941 4,137 7 Golden ratio years
26 February 1941 4,167 6,000,000 minutes
26 February 1941 4,167 100,000 hours
12 March 1941 4,181 19th Fibonacci number days
30 July 1941 4,321 4321 days
11 August 1941 4,333 1 Jupiter year
30 September 1941 4,383 12 Earth years
15 October 1941 4,398 50 Mercury years
30 November 1941 4,444 4444 days
19 January 1942 4,494 20 Venus years
27 January 1942 4,502 1 Hydrogen 3 (Tritium) half-lives
25 April 1942 4,590 4 Pi years
22 June 1942 4,648 9 Root-2 years
10 September 1942 4,728 8 Golden ratio years
30 September 1942 4,748 13 Earth years
1 November 1942 4,780 1 Californium 250 half-lives
30 November 1942 4,809 7 Mars years
21 January 1943 4,861 7,000,000 minutes
4 May 1943 4,964 5 e years
9 June 1943 5,000 5,000 days
19 July 1943 5,040 8th colossally-abundant-number days
30 September 1943 5,113 14 Earth years
21 November 1943 5,165 10 Root-2 years
13 March 1944 5,278 60 Mercury years
23 April 1944 5,319 9 Golden ratio years
11 September 1944 5,460 200 lunar orbits
30 September 1944 5,479 15 Earth years
17 October 1944 5,496 8 Mars years
15 December 1944 5,555 5555 days
16 December 1944 5,556 8,000,000 minutes
20 April 1945 5,681 11 Root-2 years
15 June 1945 5,737 5 Pi years
23 July 1945 5,775 3 Cobalt 60 half-lives
30 September 1945 5,844 16 Earth years
5 December 1945 5,910 10 Golden ratio years
20 January 1946 5,956 6 e years
5 March 1946 6,000 6,000 days
9 August 1946 6,157 70 Mercury years
26 August 1946 6,174 Kaprekar's-constant days
4 September 1946 6,183 9 Mars years
19 September 1946 6,198 12 Root-2 years
30 September 1946 6,209 17 Earth years
10 November 1946 6,250 9,000,000 minutes
27 March 1947 6,387 1,000 Pluto days
19 July 1947 6,501 11 Golden ratio years
30 September 1947 6,574 18 Earth years
31 December 1947 6,666 6666 days
17 February 1948 6,714 13 Root-2 years
15 March 1948 6,741 30 Venus years
8 April 1948 6,765 20th Fibonacci number days
22 July 1948 6,870 10 Mars years
6 August 1948 6,885 6 Pi years
22 September 1948 6,932 20 Draconic years
30 September 1948 6,940 19 Earth years
4 October 1948 6,944 10,000,000 minutes
9 October 1948 6,949 7 e years
29 November 1948 7,000 7,000 days
5 January 1949 7,037 80 Mercury years
1 March 1949 7,092 12 Golden ratio years
17 July 1949 7,230 14 Root-2 years
30 September 1949 7,305 20 Earth years
9 June 1950 7,557 11 Mars years
30 August 1950 7,639 11,000,000 minutes
30 September 1950 7,670 21 Earth years
13 October 1950 7,683 13 Golden ratio years
30 October 1950 7,700 4 Cobalt 60 half-lives
16 December 1950 7,747 15 Root-2 years
15 January 1951 7,777 7777 days
3 June 1951 7,916 90 Mercury years
29 June 1951 7,942 8 e years
26 August 1951 8,000 8,000 days
27 September 1951 8,032 7 Pi years
30 September 1951 8,035 22 Earth years
1 January 1952 8,128 4th even-perfect-number days
3 March 1952 8,190 300 lunar orbits
18 April 1952 8,236 20 Full moon cycles
26 April 1952 8,244 12 Mars years
15 May 1952 8,263 16 Root-2 years
26 May 1952 8,274 14 Golden ratio years
24 July 1952 8,333 12,000,000 minutes
24 July 1952 8,333 200,000 hours
30 September 1952 8,401 23 Earth years
25 May 1953 8,638 1234 weeks
21 June 1953 8,665 2 Jupiter years
30 September 1953 8,766 24 Earth years
14 October 1953 8,780 17 Root-2 years
30 October 1953 8,796 100 Mercury years
7 January 1954 8,865 15 Golden ratio years
30 January 1954 8,888 8888 days
14 March 1954 8,931 13 Mars years
18 March 1954 8,935 9 e years
10 May 1954 8,988 40 Venus years
22 May 1954 9,000 9,000 days
26 May 1954 9,004 2 Hydrogen 3 (Tritium) half-lives
19 June 1954 9,028 13,000,000 minutes
30 September 1954 9,131 25 Earth years
17 November 1954 9,179 8 Pi years
14 March 1955 9,296 18 Root-2 years
21 August 1955 9,456 16 Golden ratio years
30 September 1955 9,496 26 Earth years
3 December 1955 9,560 2 Californium 250 half-lives
30 January 1956 9,618 14 Mars years
6 February 1956 9,625 5 Cobalt 60 half-lives
28 March 1956 9,676 110 Mercury years
13 May 1956 9,722 14,000,000 minutes
12 August 1956 9,813 19 Root-2 years
30 September 1956 9,862 27 Earth years
4 December 1956 9,927 10 e years
14 February 1957 9,999 9999 days
15 February 1957 10,000 10,000 days
3 April 1957 10,047 17 Golden ratio years
30 September 1957 10,227 28 Earth years
17 December 1957 10,305 15 Mars years
8 January 1958 10,327 9 Pi years
10 January 1958 10,329 20 Root-2 years
21 March 1958 10,399 30 Draconic years
8 April 1958 10,417 15,000,000 minutes
24 August 1958 10,555 120 Mercury years
30 September 1958 10,592 29 Earth years
15 November 1958 10,638 18 Golden ratio years
25 November 1958 10,648 1 Curium 243 half-lives
28 May 1959 10,832 1 Saturn year
11 June 1959 10,846 21 Root-2 years
24 August 1959 10,920 400 lunar orbits
24 August 1959 10,920 11 e years
19 September 1959 10,946 21st Fibonacci number days
30 September 1959 10,957 30 Earth years
4 November 1959 10,992 16 Mars years
12 November 1959 11,000 11,000 days
2 March 1960 11,111 11111 days
2 March 1960 11,111 16,000,000 minutes
28 June 1960 11,229 19 Golden ratio years
4 July 1960 11,235 50 Venus years
30 September 1960 11,323 31 Earth years
8 November 1960 11,362 22 Root-2 years
20 January 1961 11,435 130 Mercury years
28 February 1961 11,474 10 Pi years
15 May 1961 11,550 6 Cobalt 60 half-lives
8 June 1961 11,574 1 gigasecond
21 September 1961 11,679 17 Mars years
30 September 1961 11,688 32 Earth years
25 January 1962 11,805 17,000,000 minutes
8 February 1962 11,819 20 Golden ratio years
9 April 1962 11,879 23 Root-2 years
13 May 1962 11,913 12 e years
8 August 1962 12,000 12,000 days
30 September 1962 12,053 33 Earth years
18 June 1963 12,314 140 Mercury years
19 July 1963 12,345 12345 days
27 July 1963 12,353 30 Full moon cycles
9 August 1963 12,366 18 Mars years
7 September 1963 12,395 24 Root-2 years
22 September 1963 12,410 21 Golden ratio years
30 September 1963 12,418 34 Earth years
21 December 1963 12,500 18,000,000 minutes
21 December 1963 12,500 300,000 hours
21 April 1964 12,622 11 Pi years
20 September 1964 12,774 2,000 Pluto days
30 September 1964 12,784 35 Earth years
30 January 1965 12,906 13 e years
5 February 1965 12,912 25 Root-2 years
2 May 1965 12,998 3 Jupiter years
4 May 1965 13,000 13,000 days
5 May 1965 13,001 22 Golden ratio years
26 June 1965 13,053 19 Mars years
30 September 1965 13,149 36 Earth years
14 November 1965 13,194 19,000,000 minutes
14 November 1965 13,194 150 Mercury years
6 July 1966 13,428 26 Root-2 years
22 August 1966 13,475 7 Cobalt 60 half-lives
29 August 1966 13,482 60 Venus years
22 September 1966 13,506 3 Hydrogen 3 (Tritium) half-lives
30 September 1966 13,514 37 Earth years
17 December 1966 13,592 23 Golden ratio years
13 February 1967 13,650 500 lunar orbits
14 May 1967 13,740 20 Mars years
12 June 1967 13,769 12 Pi years
9 July 1967 13,796 1 reign of Henry VIII
16 September 1967 13,865 40 Draconic years
30 September 1967 13,879 38 Earth years
10 October 1967 13,889 20,000,000 minutes
19 October 1967 13,898 14 e years
5 December 1967 13,945 27 Root-2 years
29 January 1968 14,000 14,000 days
12 April 1968 14,074 160 Mercury years
30 July 1968 14,183 24 Golden ratio years
30 September 1968 14,245 39 Earth years
3 January 1969 14,340 3 Californium 250 half-lives
31 March 1969 14,427 21 Mars years
4 May 1969 14,461 28 Root-2 years
3 September 1969 14,583 21,000,000 minutes
30 September 1969 14,610 40 Earth years
13 March 1970 14,774 25 Golden ratio years
8 July 1970 14,891 15 e years
3 August 1970 14,917 13 Pi years
8 September 1970 14,953 170 Mercury years
30 September 1970 14,975 41 Earth years
2 October 1970 14,977 29 Root-2 years
25 October 1970 15,000 15,000 days
16 February 1971 15,114 22 Mars years
30 July 1971 15,278 22,000,000 minutes
30 September 1971 15,340 42 Earth years
25 October 1971 15,365 26 Golden ratio years
29 November 1971 15,400 8 Cobalt 60 half-lives
2 March 1972 15,494 30 Root-2 years
30 September 1972 15,706 43 Earth years
23 October 1972 15,729 70 Venus years
3 January 1973 15,801 23 Mars years
4 February 1973 15,833 180 Mercury years
27 March 1973 15,884 16 e years
7 June 1973 15,956 27 Golden ratio years
23 June 1973 15,972 23,000,000 minutes
21 July 1973 16,000 16,000 days
31 July 1973 16,010 31 Root-2 years
23 September 1973 16,064 14 Pi years
30 September 1973 16,071 44 Earth years
5 August 1974 16,380 600 lunar orbits
30 September 1974 16,436 45 Earth years
4 November 1974 16,471 40 Full moon cycles
21 November 1974 16,488 24 Mars years
30 December 1974 16,527 32 Root-2 years
19 January 1975 16,547 28 Golden ratio years
19 May 1975 16,667 24,000,000 minutes
19 May 1975 16,667 400,000 hours
3 July 1975 16,712 190 Mercury years
30 September 1975 16,801 46 Earth years
15 December 1975 16,877 17 e years
16 April 1976 17,000 17,000 days
29 May 1976 17,043 33 Root-2 years
1 September 1976 17,138 29 Golden ratio years
30 September 1976 17,167 47 Earth years
8 October 1976 17,175 25 Mars years
13 November 1976 17,211 15 Pi years
7 March 1977 17,325 9 Cobalt 60 half-lives
13 March 1977 17,331 50 Draconic years
13 March 1977 17,331 4 Jupiter years
12 April 1977 17,361 25,000,000 minutes
30 September 1977 17,532 48 Earth years
28 October 1977 17,560 34 Root-2 years
29 November 1977 17,592 200 Mercury years
28 March 1978 17,711 22nd Fibonacci number days
15 April 1978 17,729 30 Golden ratio years
26 August 1978 17,862 26 Mars years
2 September 1978 17,869 18 e years
30 September 1978 17,897 49 Earth years
18 December 1978 17,976 80 Venus years
11 January 1979 18,000 18,000 days
19 January 1979 18,008 4 Hydrogen 3 (Tritium) half-lives
7 March 1979 18,055 26,000,000 minutes
28 March 1979 18,076 35 Root-2 years
30 September 1979 18,262 50 Earth years
27 November 1979 18,320 31 Golden ratio years
5 January 1980 18,359 16 Pi years
27 April 1980 18,472 210 Mercury years
13 July 1980 18,549 27 Mars years
26 August 1980 18,593 36 Root-2 years
30 September 1980 18,628 51 Earth years
30 January 1981 18,750 27,000,000 minutes
22 May 1981 18,862 19 e years
10 July 1981 18,911 32 Golden ratio years
30 September 1981 18,993 52 Earth years
7 October 1981 19,000 19,000 days
24 January 1982 19,109 37 Root-2 years
25 January 1982 19,110 700 lunar orbits
4 February 1982 19,120 4 Californium 250 half-lives
17 March 1982 19,161 3,000 Pluto days
31 May 1982 19,236 28 Mars years
14 June 1982 19,250 10 Cobalt 60 half-lives
23 September 1982 19,351 220 Mercury years
30 September 1982 19,358 53 Earth years
25 December 1982 19,444 28,000,000 minutes
21 February 1983 19,502 33 Golden ratio years
25 February 1983 19,506 17 Pi years
25 June 1983 19,626 38 Root-2 years
30 September 1983 19,723 54 Earth years
9 February 1984 19,855 20 e years
17 April 1984 19,923 29 Mars years
3 July 1984 20,000 20,000 days
30 September 1984 20,089 55 Earth years
4 October 1984 20,093 34 Golden ratio years
19 November 1984 20,139 29,000,000 minutes
22 November 1984 20,142 39 Root-2 years
11 February 1985 20,223 90 Venus years
19 February 1985 20,231 230 Mercury years
30 September 1985 20,454 56 Earth years
12 February 1986 20,589 50 Full moon cycles
5 March 1986 20,610 30 Mars years
18 April 1986 20,654 18 Pi years
23 April 1986 20,659 40 Root-2 years
18 May 1986 20,684 35 Golden ratio years
8 September 1986 20,797 60 Draconic years
30 September 1986 20,819 57 Earth years
14 October 1986 20,833 30,000,000 minutes
14 October 1986 20,833 500,000 hours
29 October 1986 20,848 21 e years
30 March 1987 21,000 21,000 days
18 July 1987 21,110 240 Mercury years
21 September 1987 21,175 41 Root-2 years
21 September 1987 21,175 11 Cobalt 60 half-lives
30 September 1987 21,184 58 Earth years
30 December 1987 21,275 36 Golden ratio years
20 January 1988 21,296 2 Curium 243 half-lives
21 January 1988 21,297 31 Mars years
8 September 1988 21,528 31,000,000 minutes
30 September 1988 21,550 59 Earth years
22 January 1989 21,664 5 Jupiter years
22 January 1989 21,664 2 Saturn years
18 February 1989 21,691 42 Root-2 years
8 June 1989 21,801 19 Pi years
17 July 1989 21,840 800 lunar orbits
17 July 1989 21,840 22 e years
12 August 1989 21,866 37 Golden ratio years
30 September 1989 21,915 60 Earth years
8 December 1989 21,984 32 Mars years
14 December 1989 21,990 250 Mercury years
24 December 1989 22,000 22,000 days
20 July 1990 22,208 43 Root-2 years
3 August 1990 22,222 22222 days
3 August 1990 22,222 32,000,000 minutes
30 September 1990 22,280 61 Earth years
26 March 1991 22,457 38 Golden ratio years
8 April 1991 22,470 100 Venus years
18 May 1991 22,510 5 Hydrogen 3 (Tritium) half-lives
30 September 1991 22,645 62 Earth years
26 October 1991 22,671 33 Mars years
18 December 1991 22,724 44 Root-2 years
5 April 1992 22,833 23 e years
12 May 1992 22,870 260 Mercury years
28 June 1992 22,917 33,000,000 minutes
30 July 1992 22,949 20 Pi years
19 September 1992 23,000 23,000 days
30 September 1992 23,011 63 Earth years
6 November 1992 23,048 39 Golden ratio years
28 December 1992 23,100 12 Cobalt 60 half-lives
14 February 1993 23,148 2 gigaseconds
3 May 1993 23,226 1 reign of Queen Victoria
12 September 1993 23,358 34 Mars years
30 September 1993 23,376 64 Earth years
23 May 1994 23,611 34,000,000 minutes
20 June 1994 23,639 40 Golden ratio years
30 September 1994 23,741 65 Earth years
8 October 1994 23,749 270 Mercury years
24 December 1994 23,826 24 e years
8 March 1995 23,900 5 Californium 250 half-lives
16 June 1995 24,000 24,000 days
31 July 1995 24,045 35 Mars years
20 September 1995 24,096 21 Pi years
30 September 1995 24,106 66 Earth years
1 February 1996 24,230 41 Golden ratio years
5 March 1996 24,263 70 Draconic years
16 April 1996 24,305 35,000,000 minutes
30 September 1996 24,472 67 Earth years
6 January 1997 24,570 900 lunar orbits
6 March 1997 24,629 280 Mercury years
23 May 1997 24,707 60 Full moon cycles
2 June 1997 24,717 110 Venus years
17 June 1997 24,732 36 Mars years
12 September 1997 24,819 25 e years
14 September 1997 24,821 42 Golden ratio years
30 September 1997 24,837 68 Earth years
12 March 1998 25,000 25,000 days
12 March 1998 25,000 36,000,000 minutes
12 March 1998 25,000 600,000 hours
6 April 1998 25,025 13 Cobalt 60 half-lives
30 September 1998 25,202 69 Earth years
11 November 1998 25,244 22 Pi years
28 April 1999 25,412 43 Golden ratio years
5 May 1999 25,419 37 Mars years
2 August 1999 25,508 290 Mercury years
11 September 1999 25,548 4,000 Pluto days
30 September 1999 25,567 70 Earth years
4 February 2000 25,694 37,000,000 minutes
31 May 2000 25,811 26 e years
30 September 2000 25,933 71 Earth years
2 December 2000 25,996 6 Jupiter years
6 December 2000 26,000 26,000 days
9 December 2000 26,003 44 Golden ratio years
22 March 2001 26,106 38 Mars years
30 September 2001 26,298 72 Earth years
29 December 2001 26,388 300 Mercury years
30 December 2001 26,389 38,000,000 minutes
1 January 2002 26,391 23 Pi years
30 September 2002 26,663 73 Earth years
7 February 2003 26,793 39 Mars years
18 February 2003 26,804 27 e years
14 July 2003 26,950 14 Cobalt 60 half-lives
28 July 2003 26,964 120 Venus years
2 September 2003 27,000 27,000 days
14 September 2003 27,012 6 Hydrogen 3 (Tritium) half-lives
30 September 2003 27,028 74 Earth years
24 November 2003 27,083 39,000,000 minutes
27 May 2004 27,268 310 Mercury years
28 June 2004 27,300 1,000 lunar orbits
30 September 2004 27,394 75 Earth years
25 December 2004 27,480 40 Mars years
21 February 2005 27,538 24 Pi years
16 April 2005 27,592 2 reigns of Henry VIII
1 September 2005 27,730 80 Draconic years
30 September 2005 27,759 76 Earth years
19 October 2005 27,778 40,000,000 minutes
7 November 2005 27,797 28 e years
29 May 2006 28,000 28,000 days
30 September 2006 28,124 77 Earth years
23 October 2006 28,147 320 Mercury years
12 November 2006 28,167 41 Mars years
13 September 2007 28,472 41,000,000 minutes
30 September 2007 28,489 78 Earth years
16 March 2008 28,657 23rd Fibonacci number days
8 April 2008 28,680 6 Californium 250 half-lives
14 April 2008 28,686 25 Pi years
27 July 2008 28,790 29 e years
31 August 2008 28,825 70 Full moon cycles
29 September 2008 28,854 42 Mars years
30 September 2008 28,855 79 Earth years
20 October 2008 28,875 15 Cobalt 60 half-lives
22 February 2009 29,000 29,000 days
21 March 2009 29,027 330 Mercury years
7 August 2009 29,166 42,000,000 minutes
8 August 2009 29,167 700,000 hours
21 September 2009 29,211 130 Venus years
30 September 2009 29,220 80 Earth years
17 August 2010 29,541 43 Mars years
30 September 2010 29,585 81 Earth years
15 April 2011 29,782 30 e years
5 June 2011 29,833 26 Pi years
3 July 2011 29,861 43,000,000 minutes
17 August 2011 29,906 340 Mercury years
30 September 2011 29,950 82 Earth years
19 November 2011 30,000 30,000 days
19 December 2011 30,030 1,100 lunar orbits
4 July 2012 30,228 44 Mars years
23 July 2012 30,247 4321 weeks
30 September 2012 30,316 83 Earth years
13 October 2012 30,329 7 Jupiter years
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