A penumbral lunar eclipse occurred at the Moon’s ascending node of orbit on Thursday, June 27, 1991, with an umbral magnitude of −0.7571. A lunar eclipse occurs when the Moon moves into the Earth's shadow, causing the Moon to be darkened. A penumbral lunar eclipse occurs when part or all of the Moon's near side passes into the Earth's penumbra. Unlike a solar eclipse, which can only be viewed from a relatively small area of the world, a lunar eclipse may be viewed from anywhere on the night side of Earth. Occurring only about 5 hours before apogee (on June 27, 1991, at 8:20 UTC), the Moon's apparent diameter was smaller.
This eclipse was the second of four lunar eclipses in 1991, with the others occurring on January 30 (penumbral), July 26 (penumbral), and December 21 (partial).
Visibility The eclipse was completely visible over eastern North America, South America, west and southern Africa, and Antarctica, seen rising over western and northern North America and the eastern Pacific Ocean and setting over Europe, east and north Africa, and the Middle East.
Eclipse details Shown below is a table displaying details about this particular lunar eclipse. It describes various parameters pertaining to this eclipse.
+June 27, 1991 Lunar Eclipse Parameters Parameter Value Penumbral Magnitude 0.31266 Umbral Magnitude −0.75714 Gamma −1.40641 Sun Right Ascension 06h21m48.4s Sun Declination +23°20'47.4" Sun Semi-Diameter 15'44.0" Sun Equatorial Horizontal Parallax 08.7" Moon Right Ascension 18h22m33.4s Moon Declination -24°36'00.3" Moon Semi-Diameter 14'42.5" Moon Equatorial Horizontal Parallax 0°53'58.6" ΔT 57.9 s
Eclipse season
This eclipse is part of an eclipse season, a period, roughly every six months, when eclipses occur. Only two (or occasionally three) eclipse seasons occur each year, and each season lasts about 35 days and repeats just short of six months (173 days) later; thus two full eclipse seasons always occur each year. Either two or three eclipses happen each eclipse season. In the sequence below, each eclipse is separated by a fortnight. The first and last eclipse in this sequence is separated by one synodic month.
+ Eclipse season of June–July 1991 June 27Ascending node (full moon) July 11Descending node (new moon) July 26Ascending node (full moon) Penumbral lunar eclipseLunar Saros 110 Total solar eclipseSolar Saros 136 Penumbral lunar eclipseLunar Saros 148
Related eclipses Eclipses in 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.
Metonic Followed by: Lunar eclipse of April 15, 1995
Tzolkinex Preceded by: Lunar eclipse of May 15, 1984 Followed by: Lunar eclipse of August 8, 1998
Half-Saros Preceded by: Solar eclipse of June 21, 1982 Followed by: Solar eclipse of July 1, 2000
Tritos Preceded by: Lunar eclipse of July 27, 1980 Followed by: Lunar eclipse of May 26, 2002
Lunar Saros 110 Preceded by: Lunar eclipse of June 15, 1973 Followed by: Lunar eclipse of July 7, 2009
Inex Preceded by: Lunar eclipse of July 17, 1962 Followed by: Lunar eclipse of June 5, 2020
Triad Followed by: Lunar eclipse of April 27, 2078
Lunar eclipses of 1991–1994
Metonic series
Saros 110
Tritos series
Inex series
Half-Saros cycle A lunar eclipse will be preceded and followed by solar eclipses by 9 years and 5.5 days (a half saros).Mathematical Astronomy Morsels, Jean Meeus, p.110, Chapter 18, The half-saros This lunar eclipse is related to two partial solar eclipses of Solar Saros 117. June 21, 1982July 1, 2000
See also List of lunar eclipses List of 20th-century lunar eclipses
References
External links Saros cycle 110