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

ascending 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 Thursday, June 27, 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 −0.7571. 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 only about 5 hours before

apogee 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 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 Events Pre-1600 * 1018 – Poland and the Holy Roman Empire conclude the Peace of Bautzen. * 1287 – King Wareru founds the Hanthawaddy Kingdom, and proclaims independence from the Pagan Kingdom. 1601–1900 * 1607 – An es ...

(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 eastern

North America North America is a continent in the Northern Hemisphere, Northern and Western Hemisphere, Western hemispheres. North America is bordered to the north by the Arctic Ocean, to the east by the Atlantic Ocean, to the southeast by South Ameri ...

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 ...

west West is one of the four cardinal directions or points of the compass. It is the opposite direction from east and is the direction in which the Sun sets on the Earth. Etymology The word "west" is a Germanic word passed into some Romance langu ...

and

southern Africa Southern Africa is the southernmost region of Africa. No definition is agreed upon, but some groupings include the United Nations geoscheme for Africa, United Nations geoscheme, the intergovernmental Southern African Development Community, and ...

, and

Antarctica Antarctica () is Earth's southernmost and least-populated continent. Situated almost entirely south of the Antarctic Circle and surrounded by the Southern Ocean (also known as the Antarctic Ocean), it contains the geographic South Pole. ...

, seen rising over western and northern North America and the eastern

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

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 ...

east East is one of the four cardinal directions or points of the compass. It is the opposite direction from west and is the direction from which the Sun rises on the Earth. Etymology As in other languages, the word is formed from the fact that ea ...

and

north Africa North Africa (sometimes Northern Africa) is a region encompassing the northern portion of the African continent. There is no singularly accepted scope for the region. However, it is sometimes defined as stretching from the Atlantic shores of t ...

, and the

Middle East The Middle East (term originally coined in English language) is a geopolitical region encompassing the Arabian Peninsula, the Levant, Turkey, Egypt, Iran, and Iraq. The term came into widespread usage by the United Kingdom and western Eur ...

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 ...

. The first and last eclipse in this sequence is separated by one

synodic month In lunar calendars, a lunar month is the time between two successive Syzygy (astronomy), syzygies of the same type: new moons or full moons. The precise definition varies, especially for the beginning of the month. Variations In Shona people, S ...

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 A partial solar eclipse occurred at the Moon's ascending node of orbit on Monday, June 21, 1982, with a magnitude of 0.6168. A solar eclipse occurs when the Moon passes between Earth and the Sun, thereby totally or partly obscuring the image of th ...

* Followed by:

Solar eclipse of July 1, 2000 A partial solar eclipse occurred at the Moon’s ascending node of orbit on Saturday, July 1, 2000, with a magnitude of 0.4768. A solar eclipse occurs when the Moon passes between Earth and the Sun, thereby totally or partly obscuring the image of ...

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.

References

External links

Saros cycle 110
* 1991-06 1991 in science June 1991 {{lunar-eclipse-stub