May 1975 lunar eclipse
Template:Short description Template:Infobox lunar eclipse A total lunar eclipse occurred at the Moon’s ascending node of orbit on Sunday, May 25, 1975,[1] with an umbral magnitude of 1.4253. It was a central lunar eclipse, in which part of the Moon passed through the center of the Earth's shadow. 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 4.4 days after perigee (on May 20, 1975, at 20:50 UTC), the Moon's apparent diameter was larger.[2]
This was the first central lunar eclipse of Lunar Saros 130.
Visibility
The eclipse was completely visible over much of North America, South America, and Antarctica, seen rising over eastern Australia, northwestern North America, and the central Pacific Ocean and setting over western Europe and Africa.[3]
| File:Lunar eclipse from moon-1975May25.png File:Lunar eclipse chart close-1975May25.png |
Eclipse details
Shown below is a table displaying details about this particular solar eclipse. It describes various parameters pertaining to this eclipse.[4]
| Parameter | Value |
|---|---|
| Penumbral Magnitude | 2.42179 |
| Umbral Magnitude | 1.42533 |
| Gamma | 0.23674 |
| Sun Right Ascension | 04h05m34.7s |
| Sun Declination | +20°50'24.7" |
| Sun Semi-Diameter | 15'47.5" |
| Sun Equatorial Horizontal Parallax | 08.7" |
| Moon Right Ascension | 16h05m40.2s |
| Moon Declination | -20°36'42.2" |
| Moon Semi-Diameter | 15'50.9" |
| Moon Equatorial Horizontal Parallax | 0°58'09.7" |
| ΔT | 45.9 s |
Eclipse season
Script error: No such module "Labelled list hatnote". 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.
| May 11 Descending node (new moon) |
May 25 Ascending node (full moon) |
|---|---|
| File:SE1975May11P.png | File:Lunar eclipse chart close-1975May25.png |
| Partial solar eclipse Solar Saros 118 |
Total lunar eclipse Lunar Saros 130 |
Related eclipses
Eclipses in 1975
- A partial solar eclipse on May 11.
- A total lunar eclipse on May 25.
- A partial solar eclipse on November 3.
- A total lunar eclipse on November 18.
Metonic
- Preceded by: Lunar eclipse of August 6, 1971
- Followed by: Lunar eclipse of March 13, 1979
Tzolkinex
- Preceded by: Lunar eclipse of April 13, 1968
- Followed by: Lunar eclipse of July 6, 1982
Half-Saros
- Preceded by: Solar eclipse of May 20, 1966
- Followed by: Solar eclipse of May 30, 1984
Tritos
- Preceded by: Lunar eclipse of June 25, 1964
- Followed by: Lunar eclipse of April 24, 1986
Lunar Saros 130
- Preceded by: Lunar eclipse of May 13, 1957
- Followed by: Lunar eclipse of June 4, 1993
Inex
- Preceded by: Lunar eclipse of June 14, 1946
- Followed by: Lunar eclipse of May 4, 2004
Triad
- Preceded by: Lunar eclipse of July 23, 1888
- Followed by: Lunar eclipse of March 25, 2062
Lunar eclipses of 1973–1976
Template:Lunar eclipse set 1973-1976
Saros 130
This eclipse is a part of Saros series 130, repeating every 18 years, 11 days, and containing 71 events. The series started with a penumbral lunar eclipse on June 10, 1416. It contains partial eclipses from September 4, 1560 through April 12, 1903; total eclipses from April 22, 1921 through September 11, 2155; and a second set of partial eclipses from September 21, 2173 through May 10, 2552. The series ends at member 71 as a penumbral eclipse on July 26, 2678.
The longest duration of totality will be produced by member 35 at 101 minutes, 53 seconds on June 26, 2029. All eclipses in this series occur at the Moon’s ascending node of orbit.[5]
| Greatest | First | |||
|---|---|---|---|---|
| File:Lunar eclipse chart close-29jun26.png The greatest eclipse of the series will occur on 2029 Jun 26, lasting 101 minutes, 53 seconds.[6] |
Penumbral | Partial | Total | Central |
| 1416 Jun 10 |
1560 Sep 04 |
1921 Apr 22 File:Lunar eclipse chart close-1921Apr22.png |
1975 May 25 File:Lunar eclipse chart close-1975May25.png | |
| Last | ||||
| Central | Total | Partial | Penumbral | |
| 2083 Jul 29 File:Lunar eclipse chart close-2083Jul29.png |
2155 Sep 11 |
2552 May 10 |
2678 Jul 26 | |
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.
Tritos series
Template:Lunar Tritos series February 2008
Inex series
Template:Lunar Inex series May 2004
Half-Saros cycle
A lunar eclipse will be preceded and followed by solar eclipses by 9 years and 5.5 days (a half saros).[7] This lunar eclipse is related to two annular solar eclipses of Solar Saros 137.
| May 20, 1966 | May 30, 1984 |
|---|---|
| File:SE1966May20A.png | File:SE1984May30A.png |
See also
References
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- ↑ Listing of Eclipses of series 130
- ↑ Mathematical Astronomy Morsels, Jean Meeus, p.110, Chapter 18, The half-saros
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