June 1991 lunar eclipse

A penumbral lunar eclipse took place on Thursday, June 27, 1991, the second of four lunar eclipses in 1991. The moon entered the Earth's penumbra for about 3 hours, and was difficult to see. This lunar eclipse is the predecessor of the Solar eclipse of July 11, 1991.

Visibility

Eclipses of 1991

Saros series

This eclipse is a member of Saros series 110. The previous event occurred on June 15, 1973. The next event was on July 7, 2009.

Lunar year series

Metonic series

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 117.

June 21, 1982 July 1, 2000
gollark: Frankly, I think if I made it something like "add these two three-digit numbers" to uninstall, people would *still* complain and say "AAAA IT SAYS COMPLEX MAFS HOW DO I DO COMPLEX MAFS".
gollark: You can look at the code to verify that it does really uninstall, by the way.
gollark: And if players can't figure out to duckduckgo "number factorizer" or something when they see "factorize this number", perhaps that is their problem..
gollark: It can't really magically hide itself in the background or something because that would require basically the same sandboxing infrastructure as potatOS itself, with the same flaws.
gollark: <@151391317740486657> It does actually uninstall it, not because of the rules but because I'm just that nice!

See also

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


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