December 1991 lunar eclipse
A partial lunar eclipse took place on December 21, 1991, the last of four lunar eclipses in 1991. The moon grazed the northern edge of the umbral shadow.
![](../I/Lunar_eclipse_chart_close-1991Dec21.png.webp)
The moon passes west to east (right to left) across northern edge of the Earth's umbral shadow, shown in hourly intervals.
Visibility
This small partial eclipse was visible from North America, eastern Asia, Australia, and western South America.
Related eclipses
Eclipses of 1991
Lunar year series
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)
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 |
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Half-Saros cycle
A 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 |
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See also
- List of lunar eclipses
- List of 20th-century lunar eclipses
References
- Mathematical Astronomy Morsels, Jean Meeus, p.110, Chapter 18, The half-saros
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