- Source: May 2004 lunar eclipse
A total lunar eclipse occurred at the Moon’s descending node of orbit on Tuesday, May 4, 2004, with an umbral magnitude of 1.3035. 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 1.2 days before perigee (on May 6, 2004, at 0:30 UTC), the Moon's apparent diameter was larger.
This lunar eclipse is the third of a tetrad, with four total lunar eclipses in series, the others being on May 16, 2003; November 9, 2004; and October 28, 2004.
Visibility
The eclipse was completely visible over much of Africa, eastern Europe, Antarctica, and Asia, central, and south Asia, seen rising over South America, western Europe, and west Africa and setting over east Asia and Australia.
Eclipse details
Shown below is a table displaying details about this particular solar eclipse. It describes various parameters pertaining to this eclipse.
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.
Related lunar eclipses
= Eclipses in 2004
=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.
= Metonic
=Preceded by: Lunar eclipse of July 16, 2000
Followed by: Lunar eclipse of February 21, 2008
= Tzolkinex
=Preceded by: Lunar eclipse of March 24, 1997
Followed by: Lunar eclipse of June 15, 2011
= Half-Saros
=Preceded by: Solar eclipse of April 29, 1995
Followed by: Solar eclipse of May 10, 2013
= Tritos
=Preceded by: Lunar eclipse of June 4, 1993
Followed by: Lunar eclipse of April 4, 2015
= Lunar Saros 131
=Preceded by: Lunar eclipse of April 24, 1986
Followed by: Lunar eclipse of May 16, 2022
= Inex
=Preceded by: Lunar eclipse of May 25, 1975
Followed by: Lunar eclipse of April 14, 2033
= Triad
=Preceded by: Lunar eclipse of July 4, 1917
Followed by: Lunar eclipse of March 5, 2091
= Lunar eclipses of 2002–2005
== Saros 131
=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.
= Metonic series
=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.
= Half-Saros cycle
=A lunar eclipse will be preceded and followed by solar eclipses by 9 years and 5.5 days (a half saros). This lunar eclipse is related to two annular solar eclipses of Solar Saros 138.
See also
List of lunar eclipses and List of 21st-century lunar eclipses
May 2003 lunar eclipse
November 2003 lunar eclipse
October 2004 lunar eclipse
Notes
External links
NASA
2004 May 04 chart: Eclipse Predictions by Fred Espenak, NASA/GSFC
[1] APOD 2004 May 6, A Lunar Eclipse Mosaic, from Greece
[2] APOD 2004 May 8, Good Morning Sydney, Sydney Australia
Photos Archived 2009-02-28 at the Wayback Machine
Spaceweather.com: Lunar eclipse gallery
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