A penumbral lunar eclipse occurred at the Moon’s ascending node of orbit on Friday, July 26, 1991, with an umbral magnitude of −0.8109. 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 about 2.25 days after apogee (on July 24, 1991, at 12:10 UTC), the Moon's apparent diameter was smaller.
This eclipse was the third of four lunar eclipses in 1991, with the others occurring on January 30 (penumbral), June 27 (penumbral), and December 21 (partial).
Visibility The eclipse was completely visible over east Africa, much of Asia, Australia, and Antarctica, seen rising over much of Europe and west and central Africa and setting over northeast Asia and the central Pacific Ocean.
Eclipse details Shown below is a table displaying details about this particular solar eclipse. It describes various parameters pertaining to this eclipse.
+July 26, 1991 Lunar Eclipse Parameters Parameter Value Penumbral Magnitude 0.25425 Umbral Magnitude −0.81093 Gamma 1.43698 Sun Right Ascension 08h22m14.5s Sun Declination +19°25'45.6" Sun Semi-Diameter 15'44.9" Sun Equatorial Horizontal Parallax 08.7" Moon Right Ascension 20h20m28.0s Moon Declination -18°11'58.5" Moon Semi-Diameter 14'47.1" Moon Equatorial Horizontal Parallax 0°54'15.7" ΔT 58.0 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 Preceded by: Lunar eclipse of October 7, 1987
Tzolkinex Preceded by: Lunar eclipse of June 13, 1984 Followed by: Lunar eclipse of September 6, 1998
Half-Saros Preceded by: Solar eclipse of July 20, 1982 Followed by: Solar eclipse of July 31, 2000
Tritos Preceded by: Lunar eclipse of August 26, 1980 Followed by: Lunar eclipse of June 24, 2002
Lunar Saros 148 Preceded by: Lunar eclipse of July 15, 1973 Followed by: Lunar eclipse of August 6, 2009
Inex Preceded by: Lunar eclipse of August 15, 1962 Followed by: Lunar eclipse of July 5, 2020
Triad Preceded by: Lunar eclipse of September 24, 1904
Lunar eclipses of 1988–1991
Saros 148
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 155. July 20, 1982July 31, 2000
See also List of lunar eclipses List of 20th-century lunar eclipses
Notes
External links