December 1991 lunar eclipse

The moon passes west to east (right to left) across northern edge of the Earth's umbral shadow, shown in hourly intervals.

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.

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

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
1991 Jun 27 - penumbral (110) 2010 Jun 26 - partial (120) 2029 Jun 26 - total (130) 2048 Jun 26 - partial (140) 2067 Jun 27 - penumbral (150)	1991 Dec 21 - partial (115) 2010 Dec 21 - total (125) 2029 Dec 20 - total (135) 2048 Dec 20 - partial (145)

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.