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August 1988 lunar eclipse
Astronomical event From Wikipedia, the free encyclopedia
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A partial lunar eclipse occurred at the Moon’s ascending node of orbit on Saturday, August 27, 1988,[1] with an umbral magnitude of 0.2916. 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 only about 7 hours before perigee (on August 17, 1988, at 17:50 UTC), the Moon's apparent diameter was larger.[2]
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Visibility
The eclipse was completely visible over eastern Australia, western North America, and much of the Pacific Ocean, seen rising over western Australia and the eastern half of Asia and setting over much of North America and South America.[3]
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Eclipse details
Shown below is a table displaying details about this particular solar eclipse. It describes various parameters pertaining to this eclipse.[4]
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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
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Eclipses in 1988
- A penumbral lunar eclipse on March 3.
- A total solar eclipse on March 18.
- A partial lunar eclipse on August 27.
- An annular solar eclipse on September 11.
Metonic
- Preceded by: Lunar eclipse of November 8, 1984
- Followed by: Lunar eclipse of June 15, 1992
Tzolkinex
- Preceded by: Lunar eclipse of July 17, 1981
- Followed by: Lunar eclipse of October 8, 1995
Half-Saros
- Preceded by: Solar eclipse of August 22, 1979
- Followed by: Solar eclipse of September 2, 1997
Tritos
- Preceded by: Lunar eclipse of September 27, 1977
- Followed by: Lunar eclipse of July 28, 1999
Lunar Saros 118
- Preceded by: Lunar eclipse of August 17, 1970
- Followed by: Lunar eclipse of September 7, 2006
Inex
- Preceded by: Lunar eclipse of September 17, 1959
- Followed by: Lunar eclipse of August 7, 2017
Triad
- Preceded by: Lunar eclipse of October 27, 1901
- Followed by: Lunar eclipse of June 28, 2075
Lunar eclipses of 1988–1991
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.[5]
The lunar eclipses on June 27, 1991 (penumbral) and December 21, 1991 (partial) occur in the next lunar year eclipse set.
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 be in nearly the same location relative to the background stars.
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Saros 118
This eclipse is a part of Saros series 118, repeating every 18 years, 11 days, and containing 73 events. The series started with a penumbral lunar eclipse on March 2, 1105. It contains partial eclipses from June 8, 1267 through August 12, 1375; total eclipses from August 22, 1393 through June 22, 1880; and a second set of partial eclipses from July 3, 1898 through September 18, 2024. The series ends at member 73 as a penumbral eclipse on May 7, 2403.
The longest duration of totality was produced by member 37 at 99 minutes, 22 seconds on April 7, 1754. All eclipses in this series occur at the Moon’s ascending node of orbit.[6]
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).[8] This lunar eclipse is related to two solar eclipses of Solar Saros 125.
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See also
Notes
External links
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