# May 1975 lunar eclipse

A total lunar eclipse occurred at the Moon’s ascending node of orbit on Sunday, May 25, 1975, 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.
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.

## Eclipse details

Shown below is a table displaying details about this particular solar eclipse. It describes various parameters pertaining to this eclipse.
May 25, 1975 Lunar Eclipse Parameters :
| 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

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 May 1975 :
| May 11 Descending node (new moon) | May 25 Ascending node (full moon) |
| 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

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.
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 | Ascending node | Ascending node | Ascending node | Descending node | Descending node | Descending 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 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.
| Greatest | First | First | First | First |
| The greatest eclipse of the series will occur on 2029 Jun 26, lasting 101 minutes, 53 seconds. | Penumbral | Partial | Total | Central |
| The greatest eclipse of the series will occur on 2029 Jun 26, lasting 101 minutes, 53 seconds. | 1416 Jun 10 | 1560 Sep 04 | 1921 Apr 22 | 1975 May 25 |
| Last ||||
| The greatest eclipse of the series will occur on 2029 Jun 26, lasting 101 minutes, 53 seconds. | Central | Total | Partial | Penumbral |
| The greatest eclipse of the series will occur on 2029 Jun 26, lasting 101 minutes, 53 seconds. | 2083 Jul 29 | 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.
Series members 23–44 occur between 1801 and 2200: :
| 23 | 23 | 24 | 24 | 25 | 25 |
| 1813 Feb 15 | 1813 Feb 15 | 1831 Feb 26 | 1831 Feb 26 | 1849 Mar 09 | 1849 Mar 09 |
| 26 | 26 | 27 | 27 | 28 | 28 |
| 1867 Mar 20 | 1867 Mar 20 | 1885 Mar 30 | 1885 Mar 30 | 1903 Apr 12 | 1903 Apr 12 |
| 29 | 29 | 30 | 30 | 31 | 31 |
| 1921 Apr 22 | 1921 Apr 22 | 1939 May 03 | 1939 May 03 | 1957 May 13 | 1957 May 13 |
| 32 | 32 | 33 | 33 | 34 | 34 |
| 1975 May 25 | 1975 May 25 | 1993 Jun 04 | 1993 Jun 04 | 2011 Jun 15 | 2011 Jun 15 |
| 35 | 35 | 36 | 36 | 37 | 37 |
| 2029 Jun 26 | 2029 Jun 26 | 2047 Jul 07 | 2047 Jul 07 | 2065 Jul 17 | 2065 Jul 17 |
| 38 | 38 | 39 | 39 | 40 | 40 |
| 2083 Jul 29 | 2083 Jul 29 | 2101 Aug 09 | 2101 Aug 09 | 2119 Aug 20 | 2119 Aug 20 |
| 41 | 41 | 42 | 42 | 43 | 43 |
| 2137 Aug 30 | 2137 Aug 30 | 2155 Sep 11 | 2155 Sep 11 | 2173 Sep 21 | 2173 Sep 21 |
| 44 ||
| 2191 Oct 02 ||

### Tritos series

This eclipse is a part of a tritos cycle, repeating at alternating nodes every 135 synodic months (≈ 3986.63 days, or 11 years minus 1 month). Their appearance and longitude are irregular due to a lack of synchronization with the anomalistic month (period of perigee), but groupings of 3 tritos cycles (≈ 33 years minus 3 months) come close (≈ 434.044 anomalistic months), so eclipses are similar in these groupings.
Series members between 1801 and 2200 :
| 1811 Sep 02 (Saros 115) | 1811 Sep 02 (Saros 115) | 1822 Aug 03 (Saros 116) | 1822 Aug 03 (Saros 116) | 1833 Jul 02 (Saros 117) | 1833 Jul 02 (Saros 117) | 1844 May 31 (Saros 118) | 1844 May 31 (Saros 118) | 1855 May 02 (Saros 119) | 1855 May 02 (Saros 119) |
| 1866 Mar 31 (Saros 120) | 1866 Mar 31 (Saros 120) | 1877 Feb 27 (Saros 121) | 1877 Feb 27 (Saros 121) | 1888 Jan 28 (Saros 122) | 1888 Jan 28 (Saros 122) | 1898 Dec 27 (Saros 123) | 1898 Dec 27 (Saros 123) | 1909 Nov 27 (Saros 124) | 1909 Nov 27 (Saros 124) |
| 1920 Oct 27 (Saros 125) | 1920 Oct 27 (Saros 125) | 1931 Sep 26 (Saros 126) | 1931 Sep 26 (Saros 126) | 1942 Aug 26 (Saros 127) | 1942 Aug 26 (Saros 127) | 1953 Jul 26 (Saros 128) | 1953 Jul 26 (Saros 128) | 1964 Jun 25 (Saros 129) | 1964 Jun 25 (Saros 129) |
| 1975 May 25 (Saros 130) | 1975 May 25 (Saros 130) | 1986 Apr 24 (Saros 131) | 1986 Apr 24 (Saros 131) | 1997 Mar 24 (Saros 132) | 1997 Mar 24 (Saros 132) | 2008 Feb 21 (Saros 133) | 2008 Feb 21 (Saros 133) | 2019 Jan 21 (Saros 134) | 2019 Jan 21 (Saros 134) |
| 2029 Dec 20 (Saros 135) | 2029 Dec 20 (Saros 135) | 2040 Nov 18 (Saros 136) | 2040 Nov 18 (Saros 136) | 2051 Oct 19 (Saros 137) | 2051 Oct 19 (Saros 137) | 2062 Sep 18 (Saros 138) | 2062 Sep 18 (Saros 138) | 2073 Aug 17 (Saros 139) | 2073 Aug 17 (Saros 139) |
| 2084 Jul 17 (Saros 140) | 2084 Jul 17 (Saros 140) | 2095 Jun 17 (Saros 141) | 2095 Jun 17 (Saros 141) | 2106 May 17 (Saros 142) | 2106 May 17 (Saros 142) | 2117 Apr 16 (Saros 143) | 2117 Apr 16 (Saros 143) | 2128 Mar 16 (Saros 144) | 2128 Mar 16 (Saros 144) |
| 2139 Feb 13 (Saros 145) | 2139 Feb 13 (Saros 145) | 2150 Jan 13 (Saros 146) | 2150 Jan 13 (Saros 146) | 2160 Dec 13 (Saros 147) | 2160 Dec 13 (Saros 147) | 2171 Nov 12 (Saros 148) | 2171 Nov 12 (Saros 148) | 2182 Oct 11 (Saros 149) | 2182 Oct 11 (Saros 149) |
| 2193 Sep 11 (Saros 150) ||

### Inex series

This eclipse is a part of the long period inex cycle, repeating at alternating nodes, every 358 synodic months (≈ 10,571.95 days, or 29 years minus 20 days). Their appearance and longitude are irregular due to a lack of synchronization with the anomalistic month (period of perigee). However, groupings of 3 inex cycles (≈ 87 years minus 2 months) comes close (≈ 1,151.02 anomalistic months), so eclipses are similar in these groupings.
Series members between 1801 and 2200 :
| 1801 Sep 22 (Saros 124) | 1801 Sep 22 (Saros 124) | 1830 Sep 02 (Saros 125) | 1830 Sep 02 (Saros 125) | 1859 Aug 13 (Saros 126) | 1859 Aug 13 (Saros 126) |
| 1888 Jul 23 (Saros 127) | 1888 Jul 23 (Saros 127) | 1917 Jul 04 (Saros 128) | 1917 Jul 04 (Saros 128) | 1946 Jun 14 (Saros 129) | 1946 Jun 14 (Saros 129) |
| 1975 May 25 (Saros 130) | 1975 May 25 (Saros 130) | 2004 May 04 (Saros 131) | 2004 May 04 (Saros 131) | 2033 Apr 14 (Saros 132) | 2033 Apr 14 (Saros 132) |
| 2062 Mar 25 (Saros 133) | 2062 Mar 25 (Saros 133) | 2091 Mar 05 (Saros 134) | 2091 Mar 05 (Saros 134) | 2120 Feb 14 (Saros 135) | 2120 Feb 14 (Saros 135) |
| 2149 Jan 23 (Saros 136) | 2149 Jan 23 (Saros 136) | 2178 Jan 04 (Saros 137) | 2178 Jan 04 (Saros 137) |

### 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 137.
| May 20, 1966 | May 30, 1984 |