A penumbral

lunar eclipse A lunar eclipse is an astronomical event that occurs when the Moon moves into the Earth's shadow, causing the Moon to be darkened. Such an alignment occurs during an eclipse season, approximately every six months, during the full moon phase, ...

occurred at the Moon’s

descending node An orbital node is either of the two points where an orbit intersects a plane of reference to which it is inclined. A non-inclined orbit, which is contained in the reference plane, has no nodes. Planes of reference Common planes of referenc ...

of orbit on Wednesday, January 30, 1991, with an umbral

magnitude Magnitude may refer to: Mathematics *Euclidean vector, a quantity defined by both its magnitude and its direction *Magnitude (mathematics), the relative size of an object *Norm (mathematics), a term for the size or length of a vector *Order of ...

of −0.1106. A lunar eclipse occurs when the

Moon The Moon is Earth's only natural satellite. It Orbit of the Moon, orbits around Earth at Lunar distance, an average distance of (; about 30 times Earth diameter, Earth's diameter). The Moon rotation, rotates, with a rotation period (lunar ...

moves into the

Earth's shadow Earth's shadow (or Earth shadow) is the shadow that Earth itself casts through its atmosphere and into outer space, toward the antisolar point. During the twilight period (both early dusk and late dawn), the shadow's visible fringe – someti ...

, 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 A solar eclipse occurs when the Moon passes between Earth and the Sun, thereby obscuring the view of the Sun from a small part of Earth, totally or partially. Such an alignment occurs approximately every six months, during the eclipse season i ...

, which can only be viewed from a relatively small area of the world, a lunar eclipse may be viewed from anywhere on the

night Night, or nighttime, is the period of darkness when the Sun is below the horizon. Sunlight illuminates one side of the Earth, leaving the other in darkness. The opposite of nighttime is daytime. Earth's rotation causes the appearance of ...

side of Earth. Occurring about 1.9 days after

perigee An apsis (; ) is the farthest or nearest point in the orbit of a planetary body about its primary body. The line of apsides (also called apse line, or major axis of the orbit) is the line connecting the two extreme values. Apsides perta ...

(on January 28, 1991, at 8:35 UTC), the Moon's apparent diameter was larger. This eclipse was the first of four lunar eclipses in 1991, with the others occurring on

June 27 Events Pre-1600 * 1358 – The Republic of Ragusa is founded. * 1497 – Cornish rebels Michael An Gof and Thomas Flamank are executed at Tyburn, London, England. * 1499 – Amerigo Vespucci sights what is now Amapá State in B ...

(penumbral),

July 26 Events Pre-1600 * 657 – First Fitna: In the Battle of Siffin, troops led by Ali ibn Abu Talib clash with those led by Muawiyah I. * 811 – Battle of Pliska: Byzantine Emperor Nikephoros I is killed and his heir Staurakios is seri ...

(penumbral), and

December 21 Events Pre-1600 *AD 69 – The Roman Senate declares Vespasian Roman emperor, emperor of Rome, the last in the Year of the Four Emperors. *1124 – Pope Honorius II is consecrated, having been elected after the controversial dethroning ...

(partial).

Visibility

The eclipse was completely visible over

North North is one of the four compass points or cardinal directions. It is the opposite of south and is perpendicular to east and west. ''North'' is a noun, adjective, or adverb indicating Direction (geometry), direction or geography. Etymology T ...

and

South America South America is a continent entirely in the Western Hemisphere and mostly in the Southern Hemisphere, with a considerably smaller portion in the Northern Hemisphere. It can also be described as the southern Subregion#Americas, subregion o ...

, seen rising over

northeast Asia Northeast Asia or Northeastern Asia is a geographical Subregion#Asia, subregion of Asia. Its northeastern landmass and islands are bounded by the Pacific Ocean, North Pacific Ocean. The term Northeast Asia was popularized during the 1930s by Ame ...

and the central

Pacific Ocean The Pacific Ocean is the largest and deepest of Earth's five Borders of the oceans, oceanic divisions. It extends from the Arctic Ocean in the north to the Southern Ocean, or, depending on the definition, to Antarctica in the south, and is ...

and setting over much of

Africa Africa is the world's second-largest and second-most populous continent after Asia. At about 30.3 million km2 (11.7 million square miles) including adjacent islands, it covers 20% of Earth's land area and 6% of its total surfac ...

and

Europe Europe is a continent located entirely in the Northern Hemisphere and mostly in the Eastern Hemisphere. It is bordered by the Arctic Ocean to the north, the Atlantic Ocean to the west, the Mediterranean Sea to the south, and Asia to the east ...

Eclipse details

Shown below is a table displaying details about this particular solar eclipse. It describes various parameters pertaining to this eclipse.

Eclipse season

This eclipse is part of an

eclipse season An eclipse season is a period, roughly every six months, when eclipses occur. Eclipse seasons are the result of the axial parallelism of the Orbit of the Moon, Moon's orbital plane (orbital inclination, tilted five degrees to the ecliptic, Earth ...

, 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 A fortnight is a unit of time equal to 14 days (two weeks). The word derives from the Old English term , meaning "" (or "fourteen days", since the Anglo-Saxons counted by nights). Astronomy and tides In astronomy, a ''lunar fortnight'' is hal ...

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 April 14, 1987 * Followed by: Lunar eclipse of November 18, 1994

Tzolkinex

* Preceded by: Lunar eclipse of December 20, 1983 * Followed by: Lunar eclipse of March 13, 1998

Half-Saros

* Preceded by: Solar eclipse of January 25, 1982 * Followed by: Solar eclipse of February 5, 2000

Tritos

* Preceded by: Lunar eclipse of March 1, 1980 * Followed by: Lunar eclipse of December 30, 2001

Lunar Saros 143

* Preceded by: Lunar eclipse of January 18, 1973 * Followed by: Lunar eclipse of February 9, 2009

Inex

* Preceded by: Lunar eclipse of February 19, 1962 * Followed by: Lunar eclipse of January 10, 2020

Triad

* Preceded by: Lunar eclipse of March 31, 1904 * Followed by: Lunar eclipse of November 29, 2077

Lunar eclipses of 1988–1991

Saros 143

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 150.

Notes

External links

* {{DEFAULTSORT:Lunar eclipse 1991-01 1991-01 1991 in science January 1991