July 2009 lunar eclipse

A penumbral lunar eclipse occurred at the Moon’s ascending node of orbit on Tuesday, July 7, 2009, with an umbral magnitude of −0.9116. 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 8 hours before apogee (on July 7, 2009, at 17:40 UTC), the Moon's apparent diameter was smaller. This eclipse entered only the southernmost tip of the penumbral shadow and thus was predicted to be very difficult to observe visually.Sky&Telescope: "The moon skims through too little of the penumbra to be noticed even by the most intent observer."

This eclipse was the second of four lunar eclipses in 2009, with the others occurring on February 9 (penumbral), August 6 (penumbral), and December 31 (partial).

Visibility The eclipse was completely visible over eastern Australia and western North and South America, seen rising over western Australia and setting over eastern North and South America.

Hourly motion shown right to leftThe Moon's hourly motion across the Earth's shadow in the constellation of Sagittarius. Visibility map

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

+July 7, 2009 Lunar Eclipse Parameters Parameter Value Penumbral Magnitude 0.15783 Umbral Magnitude −0.91159 Gamma −1.49158 Sun Right Ascension 07h06m54.1s Sun Declination +22°32'55.2" Sun Semi-Diameter 15'43.9" Sun Equatorial Horizontal Parallax 08.7" Moon Right Ascension 19h08m08.1s Moon Declination -23°51'38.0" Moon Semi-Diameter 14'42.6" Moon Equatorial Horizontal Parallax 0°53'59.3" ΔT 65.9 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 July–August 2009 July 7Ascending node (full moon) July 22Descending node (new moon) August 6Ascending node (full moon) Penumbral lunar eclipseLunar Saros 110 Total solar eclipseSolar Saros 136 Penumbral lunar eclipseLunar Saros 148

Related eclipses Eclipses in 2009 An annular solar eclipse on January 26. A penumbral lunar eclipse on February 9. A penumbral lunar eclipse on July 7. A total solar eclipse on July 22. A penumbral lunar eclipse on August 6. A partial lunar eclipse on December 31.

Metonic Followed by: Lunar eclipse of April 25, 2013

Tzolkinex Preceded by: Lunar eclipse of May 26, 2002 Followed by: Lunar eclipse of August 18, 2016

Half-Saros Preceded by: Solar eclipse of July 1, 2000 Followed by: Solar eclipse of July 13, 2018

Tritos Preceded by: Lunar eclipse of August 8, 1998 Followed by: Lunar eclipse of June 5, 2020

Lunar Saros 110 Preceded by: Lunar eclipse of June 27, 1991 Followed by: Lunar eclipse of July 18, 2027

Inex Preceded by: Lunar eclipse of July 27, 1980 Followed by: Lunar eclipse of June 17, 2038

Triad Followed by: Lunar eclipse of May 7, 2096

Lunar eclipses of 2009–2013

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. July 1, 2000July 13, 2018

July 2009 lunar eclipse

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