Solar eclipse of June 20, 1955

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.[13]

Note: Partial solar eclipse of February 14, 1953 and August 9, 1953 belong to the last lunar year set.

Solar eclipse series sets from 1953–1956
Descending node			Ascending node
Saros	Map		Saros	Map
116	1953 July 11 Partial		121	1954 January 5 Annular
126	1954 June 30 Total		131	1954 December 25 Annular
136	1955 June 20 Total		141	1955 December 14 Annular
146	1956 June 8 Total		151	1956 December 2 Partial

Solar Saros 136, repeating every 18 years, 11 days, contains 71 events. The series started with partial solar eclipse on June 14, 1360, and reached a first annular eclipse on September 8, 1504. It was a hybrid event from November 22, 1612, through January 17, 1703, and total eclipses from January 27, 1721, through May 13, 2496. The series ends at member 71 as a partial eclipse on July 30, 2622, with the entire series lasting 1262 years. The longest eclipse occurred on June 20, 1955, with a maximum duration of totality at 7 minutes, 7.74 seconds. All eclipses in this series occurs at the Moon's descending node.[14]

Series members 29–43 occur between 1865 and 2117
29	30	31
Apr 25, 1865	May 6, 1883	May 18, 1901
32	33	34
May 29, 1919	Jun 8, 1937	Jun 20, 1955
35	36	37
Jun 30, 1973	Jul 11, 1991	Jul 22, 2009
38	39	40
Aug 2, 2027	Aug 12, 2045	Aug 24, 2063
41	42	43
Sep 3, 2081	Sep 14, 2099	Sep 26, 2117

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.

Inex series members between 1901 and 2100:
July 9, 1926 (Saros 135)	June 20, 1955 (Saros 136)	May 30, 1984 (Saros 137)
May 10, 2013 (Saros 138)	April 20, 2042 (Saros 139)	March 31, 2071 (Saros 140)
March 10, 2100 (Saros 141)

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).

22 eclipse events, progressing from north to south between April 8, 1902 and August 31, 1989:
April 7–8	January 24–25	November 12	August 31-September 1	June 19–20
108			114	116
April 8, 1902			August 31, 1913	June 19, 1917
118	120	122	124	126
April 8, 1921	January 24, 1925	November 12, 1928	August 31, 1932	June 19, 1936
128	130	132	134	136
April 7, 1940	January 25, 1944	November 12, 1947	September 1, 1951	June 20, 1955
138	140	142	144	146
April 8, 1959	January 25, 1963	November 12, 1966	August 31, 1970	June 20, 1974
148	150	152	154
April 7, 1978	January 25, 1982	November 12, 1985	August 31, 1989