May 2004 lunar eclipse

• A partial solar eclipse on April 19.
• A total lunar eclipse on May 4.
• A partial solar eclipse on October 14.
• A total lunar eclipse on October 28.

It is the third of four lunar year cycles, repeating every 354 days.

Lunar eclipse series sets from 2002–2005
Descending node					Ascending node
Saros Photo	Date View	Type Chart	Gamma		Saros Photo	Date View	Type Chart	Gamma
111	2002 May 26	penumbral	1.1759		116	2002 Nov 20	penumbral	-1.1127
121	2003 May 16	total	0.4123		126	2003 Nov 09	total	-0.4319
131	2004 May 04	total	-0.3132		136	2004 Oct 28	total	0.2846
141	2005 Apr 24	penumbral	-1.0885		146	2005 Oct 17	partial	0.9796
Last set	2002 Jun 24				Last set	2001 Dec 30
Next set	2006 Mar 14				Next set	2006 Sep 7

Lunar Saros series 131, has 72 lunar eclipses. Solar Saros 138 interleaves with this lunar saros with an event occurring every 9 years 5 days alternating between each saros series.

This eclipse series began in AD 1427 with a partial eclipse at the southern edge of the Earth's shadow when the Moon was close to its descending node. Each successive Saros cycle, the Moon's orbital path is shifted northward with respect to the Earth's shadow, with the first total eclipse occurring in 1950. For the following 252 years, total eclipses occur, with the central eclipse being predicted to occur in 2078. The first partial eclipse after this is predicted to occur in the year 2220, and the final partial eclipse of the series will occur in 2707. The total lifetime of the lunar Saros series 131 is 1280 years. Solar Saros 138 interleaves with this lunar saros with an event occurring every 9 years 5 days alternating between each saros series.

Because of the ⅓ fraction of days in a Saros cycle, the visibility of each eclipse will differ for an observer at a given fixed locale. For the lunar Saros series 131, the first total eclipse of 1950 had its best visibility for viewers in Eastern Europe and the Middle East because mid-eclipse was at 20:44 UT. The following eclipse in the series occurred approximately 8 hours later in the day with mid-eclipse at 4:47 UT, and was best seen from North America and South America. The third total eclipse occurred approximately 8 hours later in the day than the second eclipse with mid-eclipse at 12:43 UT, and had its best visibility for viewers in the Western Pacific, East Asia, Australia and New Zealand. This cycle of visibility repeats from the initiation to termination of the series, with minor variations. Solar Saros 138 interleaves with this lunar saros with an event occurring every 9 years 5 days alternating between each saros series.

Lunar Saros series 131, repeating every 18 years and 11 days, has a total of 72 lunar eclipse events including 57 umbral lunar eclipses (42 partial lunar eclipses and 15 total lunar eclipses). Solar Saros 138 interleaves with this lunar saros with an event occurring every 9 years 5 days alternating between each saros series.

Greatest	First
The greatest eclipse of the series will occur on 2094 Jun 28, lasting 102 minutes.[1]	Penumbral	Partial	Total	Central
	1427 May 10	1553 July 25	1950 Apr 2	2022 May 16
	Last
	Central	Total	Partial	Penumbral
	2148 Jul 31	2202 Sep 3	2563 Apr 9	2707 Jul 7

1901–2100

1914 Mar 12		1932 Mar 22		1950 Apr 2
1968 Apr 13		1986 Apr 24		2004 May 4
2022 May 16		2040 May 26		2058 Jun 6
2076 Jun 17		2094 Jun 28

The Metonic cycle repeats nearly exactly every 19 years and represents a Saros cycle plus one lunar year. Because it occurs on the same calendar date, the earth's shadow will in nearly the same location relative to the background stars.

Metonic events: May 4 and October 28
Descending node	Ascending node
1966 May 4.88 - Penumbral (111) 1985 May 4.83 - Total (121) 2004 May 4.85 - Total (131) 2023 May 5.72 - Penumbral (141)	1966 Oct 29.42 - Penumbral (116) 1985 Oct 28.73 - Total (126) 2004 Oct 28.12 - Total (136) 2023 Oct 28.84 - Partial (146)

A lunar eclipse will be preceded and followed by solar eclipses by 9 years and 5.5 days (a half saros).[2] This lunar eclipse is related to two annular solar eclipses of Solar Saros 138.

April 29, 1995	May 10, 2013