Tritos

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A graph of lunar eclipses, grouped by their Saros cycle and Tritos cycle Tritos saros lunar series 1000-2500.png
A graph of lunar eclipses, grouped by their Saros cycle and Tritos cycle

The tritos is an eclipse cycle of 3,986.628 days (about 10 years, 11 months). It corresponds to:

Contents

The length of the tritos is equal to the length of the inex minus the length of the saros eclipse cycles. Therefore, eclipses that occur 1 tritos apart (i.e. both eclipses belong to the same tritos series), belong to two different saros series with series numbers that differ by one.

The pre-Columbian Maya used a calculation in their own observations of eclipse cycles in which a period of three tritoses (or tritoi) was approximated by 11960 days, based on 46 periods of their tzolk'in calendar (i.e. 46 × 260 days). The number of anomalistic months in a tritos (144.68), having a fraction near 23, means every third eclipse is in nearly the same position in the elliptical orbit, so eclipses will have similar timing and total versus annular quality.

Solar and lunar eclipse event dates will repeat on this cycle for about 700 years.

Example solar Tritos series

This eclipse is a part of a tritos cycle, repeating at alternating nodes every 135 synodic months (≈ 3986.63 days, or 11 years minus 1 month). Their appearance and longitude are irregular due to a lack of synchronization with the anomalistic month (period of perigee), but groupings of 3 tritos cycles (≈ 33 years minus 3 months) come close (≈ 434.044 anomalistic months), so eclipses are similar in these groupings.

Series members between 1801 and 2200
SE1805Dec21A.gif
December 21, 1805
(Saros 119)
SE1816Nov19T.gif
November 19, 1816
(Saros 120)
SE1827Oct20H.gif
October 20, 1827
(Saros 121)
SE1838Sep18A.gif
September 18, 1838
(Saros 122)
SE1849Aug18T.gif
August 18, 1849
(Saros 123)
SE1860Jul18T.gif
July 18, 1860
(Saros 124)
SE1871Jun18A.gif
June 18, 1871
(Saros 125)
SE1882May17T.png
May 17, 1882
(Saros 126)
SE1893Apr16T.png
April 16, 1893
(Saros 127)
SE1904Mar17A.png
March 17, 1904
(Saros 128)
SE1915Feb14A.png
February 14, 1915
(Saros 129)
SE1926Jan14T.png
January 14, 1926
(Saros 130)
SE1936Dec13A.png
December 13, 1936
(Saros 131)
SE1947Nov12A.png
November 12, 1947
(Saros 132)
SE1958Oct12T.png
October 12, 1958
(Saros 133)
SE1969Sep11A.png
September 11, 1969
(Saros 134)
SE1980Aug10A.png
August 10, 1980
(Saros 135)
SE1991Jul11T.png
July 11, 1991
(Saros 136)
SE2002Jun10A.png
June 10, 2002
(Saros 137)
SE2013May10A.png
May 10, 2013
(Saros 138)
SE2024Apr08T.png
April 8, 2024
(Saros 139)
SE2035Mar09A.png
March 9, 2035
(Saros 140)
SE2046Feb05A.png
February 5, 2046
(Saros 141)
SE2057Jan05T.png
January 5, 2057
(Saros 142)
SE2067Dec06H.png
December 6, 2067
(Saros 143)
SE2078Nov04A.png
November 4, 2078
(Saros 144)
SE2089Oct04T.png
October 4, 2089
(Saros 145)
SE2100Sep04T.png
September 4, 2100
(Saros 146)
SE2111Aug04A.png
August 4, 2111
(Saros 147)
Saros148 27van75 SE2122Jul04T.jpg
July 4, 2122
(Saros 148)
SE2133Jun03T.png
June 3, 2133
(Saros 149)
Saros150 24van71 SE2144May03A.jpg
May 3, 2144
(Saros 150)
SE2155Apr02A.png
April 2, 2155
(Saros 151)
Saros152 21van70 SE2166Mar02T.jpg
March 2, 2166
(Saros 152)
Saros153 18van70 SE2177Jan29A.jpg
January 29, 2177
(Saros 153)
Saros154 16van71 SE2187Dec29A.jpg
December 29, 2187
(Saros 154)
SE2198Nov28T.png
November 28, 2198
(Saros 155)

Example lunar Tritos series

The tritos series repeats 31 days short of 11 years at alternating nodes. Sequential events have incremental Saros cycle indices.

This series produces 23 total eclipses between June 22, 1880 and August 9, 2120.

Tritos eclipse series (subset 1901–2100)
Ascending node Descending node
Saros Date
Viewing
Type
chart
SarosDate
Viewing
Type
chart
120 1902 Apr 22
Lunar eclipse from moon-1902Apr22.png
Total
Lunar eclipse chart close-1902Apr22.png
121 1913 Mar 22
Lunar eclipse from moon-1913Mar22.png
Total
Lunar eclipse chart close-1913Mar22.png
122 1924 Feb 20
Lunar eclipse from moon-1924Feb20.png
Total
Lunar eclipse chart close-1924Feb20.png
123 1935 Jan 19
Lunar eclipse from moon-1935Jan19.png
Total
Lunar eclipse chart close-1935Jan19.png
124 1945 Dec 19
Lunar eclipse from moon-1945Dec19.png
Total
Lunar eclipse chart close-1945Dec19.png
125 1956 Nov 18
Lunar eclipse from moon-1956Nov18.png
Total
Lunar eclipse chart close-1956Nov18.png
126 1967 Oct 18
Lunar eclipse from moon-1967Oct18.png
Total
Lunar eclipse chart close-1967Oct18.png
127 1978 Sep 16
Lunar eclipse from moon-1978Sep16.png
Total
Lunar eclipse chart close-1978Sep16.png
128 1989 Aug 17
Lunar eclipse from moon-1989Aug17.png
Total
Lunar eclipse chart close-1989Aug17.png
129 2000 Jul 16
Lunar eclipse from moon-2000Jul16.png
Total
Lunar eclipse chart close-2000jul16.png
130 2011 Jun 15
Lunar eclipse from moon-2011Jun15.png
Total
Lunar eclipse chart close-2011jun15.png
131 2022 May 16
Lunar eclipse from moon-2022May16.png
Total
Lunar eclipse chart close-2022may16.png
132 2033 Apr 14
Lunar eclipse from moon-2033Apr14.png
Total
Lunar eclipse chart close-2033Apr14.png
133 2044 Mar 13
Lunar eclipse from moon-2044Mar13.png
Total
Lunar eclipse chart close-2044Mar13.png
134 2055 Feb 11
Lunar eclipse from moon-2055Feb11.png
Total
Lunar eclipse chart close-2055Feb11.png
135 2066 Jan 11
Lunar eclipse from moon-2066Jan11.png
Total
Lunar eclipse chart close-2066Jan11.png
136 2076 Dec 10
Lunar eclipse from moon-2076Dec10.png
Total
Lunar eclipse chart close-2076Dec10.png
137 2087 Nov 10
Lunar eclipse from moon-2087Nov10.png
Total
Lunar eclipse chart close-2087Nov10.png
138 2098 Oct 10
Lunar eclipse from moon-2098Oct10.png
Total
Lunar eclipse chart close-2098Oct10.png

See also

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References