December 1991 lunar eclipse
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
This small partial eclipse was visible from North America, eastern Asia, Australia, and western South America. File:Lunar eclipse from moon-1991Dec21.png
Related eclipses
Eclipses of 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.
Lunar year series
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 |
|---|---|
|
|
| File:Metonic lunar eclipse 1991-2067A.png | File:Metonic lunar eclipse 1991-2048D.png |
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 |
|---|---|
| File:SE1982Dec15P.png | File:SE2000Dec25P.png |
See also
References
- ↑ Mathematical Astronomy Morsels, Jean Meeus, p.110, Chapter 18, The half-saros
External links
- Saros cycle 115
- 1991 Dec 21 chart Eclipse Predictions by Fred Espenak, NASA/GSFC
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