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.

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.

Eclipses of 1991

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
  1. 1991 Jun 27 - penumbral (110)
  2. 2010 Jun 26 - partial (120)
  3. 2029 Jun 26 - total (130)
  4. 2048 Jun 26 - partial (140)
  5. 2067 Jun 27 - penumbral (150)
  1. 1991 Dec 21 - partial (115)
  2. 2010 Dec 21 - total (125)
  3. 2029 Dec 20 - total (135)
  4. 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.

December 15, 1982 December 25, 2000

See also

References
  1. Mathematical Astronomy Morsels, Jean Meeus, p.110, Chapter 18, The half-saros


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