Solar eclipse of May 31, 2068

This eclipse is a member of a semester series. An eclipse in a semester series of solar eclipses repeats approximately every 177 days and 4 hours (a semester) at alternating nodes of the Moon's orbit.[1]

Solar eclipse series sets from 2065–2069
Descending node			Ascending node
118	July 3, 2065 Partial		123	December 27, 2065 Partial
128	June 22, 2066 Annular		133	December 17, 2066 Total
138	June 11, 2067 Annular		143	December 6, 2067 Hybrid
148	May 31, 2068 Total		153	November 24, 2068 Partial
158	May 20, 2069 Partial

Solar saros 148, repeating every about 18 years and 11 days, contains 75 events. The series started with a partial solar eclipse on September 21, 1653. It has annular eclipses on April 29, 2014, and May 9, 2032, and a hybrid eclipse on May 20, 2050. It has total eclipses from May 31, 2068, to August 3, 2771. The series ends at member 75 as a partial eclipse on December 12, 2987. The longest total eclipse will be on April 26, 2609, at 5 minutes and 23 seconds.[2]

Series members 15–25 occur between 1901 and 2100:
15	16	17
February 23, 1906	March 5, 1924	March 16, 1942
18	19	20
March 27, 1960	April 7, 1978	April 17, 1996
21	22	23
April 29, 2014	May 9, 2032	May 20, 2050
24	25
May 31, 2068	June 11, 2086

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 1901 and 2100
September 9, 1904 (Saros 133)	August 10, 1915 (Saros 134)	July 9, 1926 (Saros 135)
June 8, 1937 (Saros 136)	May 9, 1948 (Saros 137)	April 8, 1959 (Saros 138)
March 7, 1970 (Saros 139)	February 4, 1981 (Saros 140)	January 4, 1992 (Saros 141)
December 4, 2002 (Saros 142)	November 3, 2013 (Saros 143)	October 2, 2024 (Saros 144)
September 2, 2035 (Saros 145)	August 2, 2046 (Saros 146)	July 1, 2057 (Saros 147)
May 31, 2068 (Saros 148)	May 1, 2079 (Saros 149)	March 31, 2090 (Saros 150)

The metonic series repeats eclipses every 19 years (6939.69 days), lasting about 5 cycles. Eclipses occur in nearly the same calendar date. In addition, the octon subseries repeats 1/5 of that or every 3.8 years (1387.94 days). All eclipses in this table occur at the Moon's descending node.

21 eclipse events between June 1, 2011 and June 1, 2087
May 31 – June 1	March 19–20	January 5–6	October 24–25	August 12–13
118	120	122	124	126
June 1, 2011	March 20, 2015	January 6, 2019	October 25, 2022	August 12, 2026
128	130	132	134	136
June 1, 2030	March 20, 2034	January 5, 2038	October 25, 2041	August 12, 2045
138	140	142	144	146
May 31, 2049	March 20, 2053	January 5, 2057	October 24, 2060	August 12, 2064
148	150	152	154	156
May 31, 2068	March 19, 2072	January 6, 2076	October 24, 2079	August 13, 2083
158	160	162	164	166
June 1, 2087			October 24, 2098