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.
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 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.
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.
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
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.
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.
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.
See also
- List of lunar eclipses
- List of 20th-century lunar eclipses
Notes
External links
- 1983 Jun 25 chart Eclipse Predictions by Fred Espenak, NASA/GSFC
