# June 1983 lunar eclipse

A partial lunar eclipse occurred at the Moon’s descending node of orbit on Saturday, June 25, 1983, with an umbral magnitude of 0.3348. A lunar eclipse occurs when the Moon moves into the Earth's shadow, causing the Moon to be darkened. A partial lunar eclipse occurs when one part of the Moon is in the Earth's umbra, while the other part is in the Earth's penumbra. 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. Occurring about 3.7 days before apogee (on June 28, 1983, at 23:40 UTC), the Moon's apparent diameter was smaller.

## Visibility

The eclipse was completely visible over western and central North America, western South America, and Antarctica, seen rising over Australia and the western Pacific Ocean and setting over eastern North and South America and west Africa.

## Eclipse details

Shown below is a table displaying details about this particular solar eclipse. It describes various parameters pertaining to this eclipse.
June 25, 1983 Lunar Eclipse Parameters :
| Parameter | Value |
| Penumbral Magnitude | 1.39014 |
| Umbral Magnitude | 0.33479 |
| Gamma | −0.81520 |
| Sun Right Ascension | 06h14m04.1s |
| Sun Declination | +23°24'07.7" |
| Sun Semi-Diameter | 15'44.1" |
| Sun Equatorial Horizontal Parallax | 08.7" |
| Moon Right Ascension | 18h13m49.6s |
| Moon Declination | -24°08'36.4" |
| Moon Semi-Diameter | 14'54.6" |
| Moon Equatorial Horizontal Parallax | 0°54'43.1" |
| ΔT | 53.4 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 June 1983 :
| June 11 Ascending node (new moon) | June 25 Descending node (full moon) |
| Total solar eclipse Solar Saros 127 | Partial lunar eclipse Lunar Saros 139 |

## Related eclipses
### Eclipses in 1983

* A total solar eclipse on June 11.
* A partial lunar eclipse on June 25.
* An annular solar eclipse on December 4.
* A penumbral lunar eclipse on December 20.

### Metonic

* Preceded by: Lunar eclipse of September 6, 1979
* Followed by: Lunar eclipse of April 14, 1987

### Tzolkinex

* Preceded by: Lunar eclipse of May 13, 1976
* Followed by: Lunar eclipse of August 6, 1990

### Half-Saros

* Preceded by: Solar eclipse of June 20, 1974
* Followed by: Solar eclipse of June 30, 1992

### Tritos

* Preceded by: Lunar eclipse of July 26, 1972
* Followed by: Lunar eclipse of May 25, 1994

### Lunar Saros 139

* Preceded by: Lunar eclipse of June 14, 1965
* Followed by: Lunar eclipse of July 5, 2001

### Inex

* Preceded by: Lunar eclipse of July 16, 1954
* Followed by: Lunar eclipse of June 4, 2012

### Triad

* Preceded by: Lunar eclipse of August 23, 1896
* Followed by: Lunar eclipse of April 25, 2070

### Lunar eclipses of 1980–1984

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 March 1, 1980 and August 26, 1980 occur in the previous lunar year eclipse set, and the penumbral lunar eclipses on May 15, 1984 and November 8, 1984 occur in the next lunar year eclipse set.
Lunar eclipse series sets from 1980 to 1984 :
| Descending node | Descending node | Descending node | Descending node | Ascending node | Ascending node | Ascending node | Ascending node |
| Saros | Date Viewing | Type Chart | Gamma | Saros | Date Viewing | Type Chart | Gamma |
| 109 | 1980 Jul 27 | Penumbral | 1.4139 | 114 | 1981 Jan 20 | Penumbral | −1.0142 |
| 119 | 1981 Jul 17 | Partial | 0.7045 | 124 | 1982 Jan 09 | Total | −0.2916 |
| 129 | 1982 Jul 06 | Total | −0.0579 | 134 | 1982 Dec 30 | Total | 0.3758 |
| 139 | 1983 Jun 25 | Partial | −0.8152 | 144 | 1983 Dec 20 | Penumbral | 1.0747 |
| 149 | 1984 Jun 13 | Penumbral | −1.5240 |

### Saros 139

This eclipse is a part of Saros series 139, repeating every 18 years, 11 days, and containing 79 events. The series started with a penumbral lunar eclipse on December 9, 1658. It contains partial eclipses from June 3, 1947 through August 7, 2055; total eclipses from August 17, 2073 through May 30, 2542; and a second set of partial eclipses from June 9, 2560 through August 25, 2686. The series ends at member 75 as a penumbral eclipse on April 13, 3065.
The longest duration of totality will be produced by member 31 at 102 minutes, 39 seconds on November 2, 2199. All eclipses in this series occur at the Moon’s descending node of orbit.
| Greatest | First | First | First | First |
| The greatest eclipse of the series will occur on 2199 Nov 02, lasting 102 minutes, 39 seconds. | Penumbral | Partial | Total | Central |
| The greatest eclipse of the series will occur on 2199 Nov 02, lasting 102 minutes, 39 seconds. | 1658 Dec 09 | 1947 Jun 03 | 2073 Aug 17 | 2109 Sep 09 |
| Last ||||
| The greatest eclipse of the series will occur on 2199 Nov 02, lasting 102 minutes, 39 seconds. | Central | Total | Partial | Penumbral |
| The greatest eclipse of the series will occur on 2199 Nov 02, lasting 102 minutes, 39 seconds. | 2488 Apr 26 | 2542 May 30 | 2686 Aug 25 | 3065 Apr 13 |
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 9–31 occur between 1801 and 2200: :
| 9 | 9 | 10 | 10 | 11 | 11 |
| 1803 Mar 08 | 1803 Mar 08 | 1821 Mar 18 | 1821 Mar 18 | 1839 Mar 30 | 1839 Mar 30 |
| 12 | 12 | 13 | 13 | 14 | 14 |
| 1857 Apr 09 | 1857 Apr 09 | 1875 Apr 20 | 1875 Apr 20 | 1893 Apr 30 | 1893 Apr 30 |
| 15 | 15 | 16 | 16 | 17 | 17 |
| 1911 May 13 | 1911 May 13 | 1929 May 23 | 1929 May 23 | 1947 Jun 03 | 1947 Jun 03 |
| 18 | 18 | 19 | 19 | 20 | 20 |
| 1965 Jun 14 | 1965 Jun 14 | 1983 Jun 25 | 1983 Jun 25 | 2001 Jul 05 | 2001 Jul 05 |
| 21 | 21 | 22 | 22 | 23 | 23 |
| 2019 Jul 16 | 2019 Jul 16 | 2037 Jul 27 | 2037 Jul 27 | 2055 Aug 07 | 2055 Aug 07 |
| 24 | 24 | 25 | 25 | 26 | 26 |
| 2073 Aug 17 | 2073 Aug 17 | 2091 Aug 29 | 2091 Aug 29 | 2109 Sep 09 | 2109 Sep 09 |
| 27 | 27 | 28 | 28 | 29 | 29 |
| 2127 Sep 20 | 2127 Sep 20 | 2145 Sep 30 | 2145 Sep 30 | 2163 Oct 12 | 2163 Oct 12 |
| 30 | 30 | 31 | 31 |
| 2181 Oct 22 | 2181 Oct 22 | 2199 Nov 02 | 2199 Nov 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 :
| 1808 Nov 03 (Saros 123) | 1808 Nov 03 (Saros 123) | 1819 Oct 03 (Saros 124) | 1819 Oct 03 (Saros 124) | 1830 Sep 02 (Saros 125) | 1830 Sep 02 (Saros 125) | 1841 Aug 02 (Saros 126) | 1841 Aug 02 (Saros 126) | 1852 Jul 01 (Saros 127) | 1852 Jul 01 (Saros 127) |
| 1863 Jun 01 (Saros 128) | 1863 Jun 01 (Saros 128) | 1874 May 01 (Saros 129) | 1874 May 01 (Saros 129) | 1885 Mar 30 (Saros 130) | 1885 Mar 30 (Saros 130) | 1896 Feb 28 (Saros 131) | 1896 Feb 28 (Saros 131) | 1907 Jan 29 (Saros 132) | 1907 Jan 29 (Saros 132) |
| 1917 Dec 28 (Saros 133) | 1917 Dec 28 (Saros 133) | 1928 Nov 27 (Saros 134) | 1928 Nov 27 (Saros 134) | 1939 Oct 28 (Saros 135) | 1939 Oct 28 (Saros 135) | 1950 Sep 26 (Saros 136) | 1950 Sep 26 (Saros 136) | 1961 Aug 26 (Saros 137) | 1961 Aug 26 (Saros 137) |
| 1972 Jul 26 (Saros 138) | 1972 Jul 26 (Saros 138) | 1983 Jun 25 (Saros 139) | 1983 Jun 25 (Saros 139) | 1994 May 25 (Saros 140) | 1994 May 25 (Saros 140) | 2005 Apr 24 (Saros 141) | 2005 Apr 24 (Saros 141) | 2016 Mar 23 (Saros 142) | 2016 Mar 23 (Saros 142) |
| 2027 Feb 20 (Saros 143) | 2027 Feb 20 (Saros 143) | 2038 Jan 21 (Saros 144) | 2038 Jan 21 (Saros 144) | 2048 Dec 20 (Saros 145) | 2048 Dec 20 (Saros 145) | 2059 Nov 19 (Saros 146) | 2059 Nov 19 (Saros 146) | 2070 Oct 19 (Saros 147) | 2070 Oct 19 (Saros 147) |
| 2081 Sep 18 (Saros 148) | 2081 Sep 18 (Saros 148) | 2092 Aug 17 (Saros 149) | 2092 Aug 17 (Saros 149) | 2103 Jul 19 (Saros 150) | 2103 Jul 19 (Saros 150) | 2114 Jun 18 (Saros 151) | 2114 Jun 18 (Saros 151) | 2125 May 17 (Saros 152) | 2125 May 17 (Saros 152) |
| 2136 Apr 16 (Saros 153) | 2136 Apr 16 (Saros 153) | | | | | 2169 Jan 13 (Saros 156) | 2169 Jan 13 (Saros 156) | | |
| 2190 Nov 12 (Saros 158) ||

### 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 :
| 1809 Oct 23 (Saros 133) | 1809 Oct 23 (Saros 133) | 1838 Oct 03 (Saros 134) | 1838 Oct 03 (Saros 134) | 1867 Sep 14 (Saros 135) | 1867 Sep 14 (Saros 135) |
| 1896 Aug 23 (Saros 136) | 1896 Aug 23 (Saros 136) | 1925 Aug 04 (Saros 137) | 1925 Aug 04 (Saros 137) | 1954 Jul 16 (Saros 138) | 1954 Jul 16 (Saros 138) |
| 1983 Jun 25 (Saros 139) | 1983 Jun 25 (Saros 139) | 2012 Jun 04 (Saros 140) | 2012 Jun 04 (Saros 140) | 2041 May 16 (Saros 141) | 2041 May 16 (Saros 141) |
| 2070 Apr 25 (Saros 142) | 2070 Apr 25 (Saros 142) | 2099 Apr 05 (Saros 143) | 2099 Apr 05 (Saros 143) | 2128 Mar 16 (Saros 144) | 2128 Mar 16 (Saros 144) |
| 2157 Feb 24 (Saros 145) | 2157 Feb 24 (Saros 145) | 2186 Feb 04 (Saros 146) | 2186 Feb 04 (Saros 146) |

### 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 total solar eclipses of Solar Saros 146.
| June 20, 1974 | June 30, 1992 |