Solar eclipse of October 4, 2070

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]

120	April 21, 2069 Partial	125	October 15, 2069 Partial
130	April 11, 2070 Total	135	October 4, 2070 Annular
140	March 31, 2071 Annular	145	September 23, 2071 Total
150	March 19, 2072 Partial	155	September 12, 2072 Total

It is a part of Saros cycle 135, repeating every 18 years, 11 days, containing 71 events. The series started with partial solar eclipse on July 5, 1331. It contains annular eclipses from October 21, 1511 through February 24, 2305, hybrid eclipses on March 8, 2323 and March 18, 2341 and total eclipses from March 29, 2359 through May 22, 2449. The series ends at member 71 as a partial eclipse on August 17, 2593. The longest duration of totality will be 2 minutes, 27 seconds on May 12, 2431.

Series members 27–43 occur between 1800 and 2100:
27	28	29
Apr 24, 1800	May 5, 1818	May 15, 1836
30	31	32
May 26, 1854	Jun 6, 1872	Jun 17, 1890
33	34	35
Jun 28, 1908	Jul 9, 1926	Jul 20, 1944
36	37	38
Jul 31, 1962	Aug 10, 1980	Aug 22, 1998
39	40	41
Sep 1, 2016	Sep 12, 2034	Sep 22, 2052
42	43
Oct 4, 2070	Oct 14, 2088

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:
January 14, 1926 (Saros 130)	December 25, 1954 (Saros 131)	December 4, 1983 (Saros 132)
November 13, 2012 (Saros 133)	October 25, 2041 (Saros 134)	October 4, 2070 (Saros 135)
September 14, 2099 (Saros 136)