A partial lunar eclipse took place on Saturday, December 21, 1991, the last of four lunar eclipses in 1991. The moon grazed the northern edge of the umbral shadow. It occurred near perigee, and as described, such event was known as a supermoon.
Visibility
editThis small partial eclipse was visible from North America, eastern Asia, Australia, and western South America.
Related eclipses
editEclipses of 1991
edit- 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.
Lunar year series
edit| Lunar eclipse series sets from 1991–1994 | ||||||||
|---|---|---|---|---|---|---|---|---|
| Ascending node | Descending node | |||||||
| Saros | Date Viewing |
Type Chart |
Gamma | Saros | Date Viewing |
Type Chart |
Gamma | |
| 110 | 1991 Jun 27
|
Penumbral
|
−1.40641 | 115 | 1991 Dec 21
|
Partial
|
0.97094 | |
| 120 | 1992 Jun 15
|
Partial
|
−0.62887 | 125 |
1992 Dec 9
|
Total
|
0.31438 | |
| 130 | 1993 Jun 4
|
Total
|
0.16376 | 135 |
1993 Nov 29
|
Total
|
−0.39941 | |
| 140 | 1994 May 25
|
Partial
|
0.89334 | 145 | 1994 Nov 18
|
Penumbral
|
−1.10479 | |
| Last set | 1991 Jul 26 | Last set | 1991 Jan 30 | |||||
| Next set | 1995 Apr 15 | Next set | 1995 Oct 08 | |||||
Metonic cycles (19 years)
editThe 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 |
|---|---|
|
|
|
|
Half-Saros cycle
editA lunar eclipse will be preceded and followed by solar eclipses by 9 years and 5.5 days (a half saros).[1] This lunar eclipse is related to two partial solar eclipses of Solar Saros 122.
| December 15, 1982 | December 25, 2000 |
|---|---|
|
|
See also
editReferences
edit- ^ Mathematical Astronomy Morsels, Jean Meeus, p.110, Chapter 18, The half-saros
External links
edit- Saros cycle 115
- 1991 Dec 21 chart Eclipse Predictions by Fred Espenak, NASA/GSFC
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