Solar eclipse of August 11, 2018

• A total lunar eclipse on January 31.
• A partial solar eclipse on February 15.
• A partial solar eclipse on July 13.
• A total lunar eclipse on July 27.
• A partial solar eclipse on August 11.

• Saros 125: Partial Solar Eclipse September 13, 2015
• Saros 135: Annular Solar Eclipse September 1, 2016
• Saros 145: Total Solar Eclipse August 21, 2017
• Saros 155: Partial Solar Eclipse August 11, 2018

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 2015–2018
Descending node				Ascending node
Saros	Map	Gamma		Saros	Map	Gamma
120 Longyearbyen, Svalbard	2015 March 20 Total	0.9453		125	2015 September 13 Partial	-1.1004
130 Balikpapan, Indonesia	2016 March 9 Total	0.2609		135 L'Étang-Salé, Réunion	2016 September 1 Annular	-0.3330
140 Partial from Buenos Aires	2017 February 26 Annular	-0.4578		145 Casper, Wyoming	2017 August 21 Total	0.4367
150 Partial from Olivos, Buenos Aires	2018 February 15 Partial	-1.2117		155 Partial from Huittinen, Finland	2018 August 11 Partial	1.1476
Partial solar eclipses on July 13, 2018, and January 6, 2019, occur during the next semester series.

It is a part of Saros cycle 155, repeating every 18 years, 11 days (223 synodic months), contains 71 events. The series started with a partial solar eclipse on June 17, 1928. It has total eclipses from September 12, 2072 to August 30, 2649. The series also has 3 hybrid eclipses from September 10, 2667 to October 3, 2703 and 20 annular eclipses from October 13, 2721 to May 8, 3064.

The series ends at member 71 as a partial eclipse on July 24, 3190. The longest total eclipses will be on October 26, 2144 and on November 7, 2162, at 4 minutes and 5 seconds.[2]

Series members 1–10 occur between 1901 and 2100:
1	2	3
June 17, 1928	June 29, 1946	July 9, 1964
4	5	6
July 20, 1982	July 31, 2000	August 11, 2018
7	8	9
August 21, 2036	September 2, 2054	September 12, 2072
10
September 23, 2090

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 ascending node.

22 eclipse events between January 5, 1935 and August 11, 2018
January 4-5	October 23-24	August 10-12	May 30-31	March 18-19
111	113	115	117	119
January 5, 1935		August 12, 1942	May 30, 1946	March 18, 1950
121	123	125	127	129
January 5, 1954	October 23, 1957	August 11, 1961	May 30, 1965	March 18, 1969
131	133	135	137	139
January 4, 1973	October 23, 1976	August 10, 1980	May 30, 1984	March 18, 1988
141	143	145	147	149
January 4, 1992	October 24, 1995	August 11, 1999	May 31, 2003	March 19, 2007
151	153	155	157	159
January 4, 2011	October 23, 2014	August 11, 2018