Solar eclipse of May 20, 2050

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]

Note: Partial lunar eclipses on January 26, 2047 and July 22, 2047 occur on the previous lunar year eclipse set.

Solar eclipse sets from 2047–2050
Descending node			Ascending node
118	June 23, 2047 Partial		123	December 16, 2047 Partial
128	June 11, 2048 Annular		133	December 5, 2048 Total
138	May 31, 2049 Annular		143	November 25, 2049 Hybrid
148	May 20, 2050 Hybrid		153	November 14, 2050 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 the long period inex cycle, repeating at alternating nodes, every 358 synodic months (≈ 10,571.95 days, or 29 years minus 20 days). Their appearance and longitude are irregular due to a lack of synchronization with the anomalistic month (period of perigee). However, groupings of 3 inex cycles (≈ 87 years minus 2 months) comes close (≈ 1,151.02 anomalistic months), so eclipses are similar in these groupings. In the 19th century:

• Solar Saros 140: Total Solar Eclipse of 1818 Oct 29

• Solar Saros 141: Annular Solar Eclipse of 1847 Oct 09

• Solar Saros 142: Total Solar Eclipse of 1876 Sep 17

Inex series members between 1901 and 2100:
August 30, 1905 (Saros 143)	August 10, 1934 (Saros 144)	July 20, 1963 (Saros 145)
June 30, 1992 (Saros 146)	June 10, 2021 (Saros 147)	May 20, 2050 (Saros 148)
May 1, 2079 (Saros 149)

In the 22nd century:

Solar Saros 150: Partial Solar Eclipse of 2108 Apr 11

Solar Saros 151: Annular Solar Eclipse of 2137 Mar 21

Solar Saros 152: Total Solar Eclipse of 2166 Mar 02

Solar Saros 153: Annular Solar Eclipse of 2195 Feb 10

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.[3]

Octon series with 21 events between May 21, 1993 and August 2, 2065
May 20–21	March 8–9	December 25–26	October 13–14	August 1–2
98	100	102	104	106
May 21, 1955	March 9, 1959	December 26, 1962	October 14, 1966	August 2, 1970
108	110	112	114	116
May 21, 1974	March 9, 1978	December 26, 1981	October 14, 1985	August 1, 1989
118	120	122	124	126
May 21, 1993	March 9, 1997	December 25, 2000	October 14, 2004	August 1, 2008
128	130	132	134	136
May 20, 2012	March 9, 2016	December 26, 2019	October 14, 2023	August 2, 2027
138	140	142	144	146
May 21, 2031	March 9, 2035	December 26, 2038	October 14, 2042	August 2, 2046
148	150	152	154	156
May 20, 2050	March 9, 2054	December 26, 2057	October 13, 2061	August 2, 2065
158	160	162	164	166
May 20, 2069	March 8, 2073	December 26, 2076	October 13, 2080	August 1, 2084