June 1991 lunar eclipse
Template:Short description Template:Infobox lunar eclipse A penumbral lunar eclipse occurred at the Moon’s ascending node of orbit on Thursday, June 27, 1991,[1] with an umbral magnitude of −0.7571. A lunar eclipse occurs when the Moon moves into the Earth's shadow, causing the Moon to be darkened. A penumbral lunar eclipse occurs when part or all of the Moon's near side passes into 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 5 hours before apogee (on June 27, 1991, at 8:20 UTC), the Moon's apparent diameter was smaller.[2]
This eclipse was the second of four lunar eclipses in 1991, with the others occurring on January 30 (penumbral), July 26 (penumbral), and December 21 (partial).
Visibility
The eclipse was completely visible over eastern North America, South America, west and southern Africa, and Antarctica, seen rising over western and northern North America and the eastern Pacific Ocean and setting over Europe, east and north Africa, and the Middle East.[3]
| File:Lunar eclipse from moon-1991Jun27.png File:Lunar eclipse chart close-1991Jun27.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 | 0.31266 |
| Umbral Magnitude | −0.75714 |
| Gamma | −1.40641 |
| Sun Right Ascension | 06h21m48.4s |
| Sun Declination | +23°20'47.4" |
| Sun Semi-Diameter | 15'44.0" |
| Sun Equatorial Horizontal Parallax | 08.7" |
| Moon Right Ascension | 18h22m33.4s |
| Moon Declination | -24°36'00.3" |
| Moon Semi-Diameter | 14'42.5" |
| Moon Equatorial Horizontal Parallax | 0°53'58.6" |
| ΔT | 57.9 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. The first and last eclipse in this sequence is separated by one synodic month.
| June 27 Ascending node (full moon) |
July 11 Descending node (new moon) |
July 26 Ascending node (full moon) |
|---|---|---|
| File:Lunar eclipse chart close-1991Jun27.png | File:SE1991Jul11T.png | File:Lunar eclipse chart close-1991Jul26.png |
| Penumbral lunar eclipse Lunar Saros 110 |
Total solar eclipse Solar Saros 136 |
Penumbral lunar eclipse Lunar Saros 148 |
Related eclipses
Eclipses in 1991
- An annular solar eclipse on January 15.
- A penumbral lunar eclipse on January 30.
- A penumbral lunar eclipse on June 27.
- A total solar eclipse on July 11.
- A penumbral lunar eclipse on July 26.
- A partial lunar eclipse on December 21.
Metonic
- Followed by: Lunar eclipse of April 15, 1995
Tzolkinex
- Preceded by: Lunar eclipse of May 15, 1984
- Followed by: Lunar eclipse of August 8, 1998
Half-Saros
- Preceded by: Solar eclipse of June 21, 1982
- Followed by: Solar eclipse of July 1, 2000
Tritos
- Preceded by: Lunar eclipse of July 27, 1980
- Followed by: Lunar eclipse of May 26, 2002
Lunar Saros 110
- Preceded by: Lunar eclipse of June 15, 1973
- Followed by: Lunar eclipse of July 7, 2009
Inex
- Preceded by: Lunar eclipse of July 17, 1962
- Followed by: Lunar eclipse of June 5, 2020
Triad
- Followed by: Lunar eclipse of April 27, 2078
Lunar eclipses of 1991–1994
Template:Lunar eclipse set 1991-1994
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.
| Ascending node | Descending node |
|---|---|
|
|
| File:Metonic lunar eclipse 1991-2067A.png | File:Metonic lunar eclipse 1991-2048D.png |
Saros 110
Template:Lunar Saros series 110
Tritos series
Template:Lunar Tritos series May 2002
Inex series
Template:Lunar Inex series June 2020
Half-Saros cycle
A lunar eclipse will be preceded and followed by solar eclipses by 9 years and 5.5 days (a half saros).[5] This lunar eclipse is related to two partial solar eclipses of Solar Saros 117.
| June 21, 1982 | July 1, 2000 |
|---|---|
| File:SE1982Jun21P.png | File:SE2000Jul01P.png |
See also
References
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