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November 1975 lunar eclipse
Total eclipse
	The Moon's hourly motion shown right to left
Date	November 18, 1975
Gamma	−0.4134
Magnitude	1.0642
Saros cycle	135 (21 of 71)
Totality	40 minutes, 11 seconds
Partiality	209 minutes, 0 seconds
Penumbral	352 minutes, 7 seconds
P1
Contacts (UTC)
P1	19:27:20
U1	20:38:57
U2	22:03:22
Greatest	22:23:26
U3	22:43:33
U4	0:07:58
P4	1:19:27
	← May 1975 May 1976 →

A total lunar eclipse occurred at the Moon’s descending node of orbit on Tuesday, November 18, 1975,^[1] with an umbral magnitude of 1.0642. A lunar eclipse occurs when the Moon moves into the Earth's shadow, causing the Moon to be darkened. A total lunar eclipse occurs when the Moon's near side entirely passes into the Earth's umbral shadow. Unlike a solar eclipse, which can only be viewed from a relatively small area of the world, a lunar eclipse may be viewed from anywhere on the night side of Earth. A total lunar eclipse can last up to nearly two hours, while a total solar eclipse lasts only a few minutes at any given place, because the Moon's shadow is smaller. Occurring about 4.9 days after apogee (on November 14, 1975, at 0:00 UTC), the Moon's apparent diameter was smaller.^[2]

Visibility

The eclipse was completely visible over Africa, Europe, and the western half of Asia, seen rising over North and South America and setting over east and southeast Asia, and Australia.^[3]

Eclipse details

Shown below is a table displaying details about this particular solar eclipse. It describes various parameters pertaining to this eclipse.^[4]

November 18, 1975 Lunar Eclipse Parameters
Parameter	Value
Penumbral Magnitude	2.13521
Umbral Magnitude	1.06421
Gamma	−0.41343
Sun Right Ascension	15h34m32.1s
Sun Declination	-19°14'45.6"
Sun Semi-Diameter	16'11.0"
Sun Equatorial Horizontal Parallax	08.9"
Moon Right Ascension	03h34m45.4s
Moon Declination	+18°52'03.2"
Moon Semi-Diameter	15'06.6"
Moon Equatorial Horizontal Parallax	0°55'27.2"
ΔT	46.4 s

Eclipse season

This eclipse is part of an eclipse season, a period, roughly every six months, when eclipses occur. Only two (or occasionally three) eclipse seasons occur each year, and each season lasts about 35 days and repeats just short of six months (173 days) later; thus two full eclipse seasons always occur each year. Either two or three eclipses happen each eclipse season. In the sequence below, each eclipse is separated by a fortnight.

Eclipse season of November 1975
November 3 Ascending node (new moon)	November 18 Descending node (full moon)

Partial solar eclipse Solar Saros 123	Total lunar eclipse Lunar Saros 135

Related eclipses

Lunar eclipses of 1973–1976

This eclipse is a member of a semester series. An eclipse in a semester series of lunar eclipses repeats approximately every 177 days and 4 hours (a semester) at alternating nodes of the Moon's orbit.^[5]

The penumbral lunar eclipses on January 18, 1973 and July 15, 1973 occur in the previous lunar year eclipse set.

Lunar eclipse series sets from 1973 to 1976
Ascending node				Descending node
Saros	Date Viewing	Type Chart	Gamma	Saros	Date Viewing	Type Chart	Gamma
110	1973 Jun 15	Penumbral	−1.3217	115	1973 Dec 10	Partial	0.9644
120	1974 Jun 04	Partial	−0.5489	125	1974 Nov 29	Total	0.3054
130	1975 May 25	Total	0.2367	135	1975 Nov 18	Total	−0.4134
140	1976 May 13	Partial	0.9586	145	1976 Nov 06	Penumbral	−1.1276

Saros 135

This eclipse is a part of Saros series 135, repeating every 18 years, 11 days, and containing 71 events. The series started with a penumbral lunar eclipse on April 13, 1615. It contains partial eclipses from July 20, 1777 through October 28, 1939; total eclipses from November 7, 1957 through July 6, 2354; and a second set of partial eclipses from July 16, 2372 through September 19, 2480. The series ends at member 71 as a penumbral eclipse on May 18, 2877.

The longest duration of totality will be produced by member 37 at 106 minutes, 13 seconds on May 12, 2264. All eclipses in this series occur at the Moon’s descending node of orbit.^[6]

Greatest	First
The greatest eclipse of the series will occur on 2264 May 12, lasting 106 minutes, 13 seconds.^[7]	Penumbral	Partial	Total	Central
	1615 Apr 13	1777 Jul 20	1957 Nov 07	2174 Mar 18
	Last
	Central	Total	Partial	Penumbral
	2318 Jun 14	2354 Jul 06	2480 Sep 19	2877 May 18

Eclipses are tabulated in three columns; every third eclipse in the same column is one exeligmos apart, so they all cast shadows over approximately the same parts of the Earth.

Series members 12–33 occur between 1801 and 2200:
12	13	14
1813 Aug 12	1831 Aug 23	1849 Sep 02

15	16	17
1867 Sep 14	1885 Sep 24	1903 Oct 06

18	19	20
1921 Oct 16	1939 Oct 28	1957 Nov 07

21	22	23
1975 Nov 18	1993 Nov 29	2011 Dec 10

24	25	26
2029 Dec 20	2048 Jan 01	2066 Jan 11

27	28	29
2084 Jan 22	2102 Feb 03	2120 Feb 14

30	31	32
2138 Feb 24	2156 Mar 07	2174 Mar 18

33
2192 Mar 28

Half-Saros cycle

A lunar eclipse will be preceded and followed by solar eclipses by 9 years and 5.5 days (a half saros).^[8] This lunar eclipse is related to two total solar eclipses of Solar Saros 142.