| 词条 | July 2009 lunar eclipse | ||||||||||||||||||||||
| 释义 |
A penumbral lunar eclipse took place on July 7, 2009, the second of four lunar eclipses in 2009. This eclipse entered only the southernmost tip of the penumbral shadow and thus was predicted to be very difficult to observe visually.[1] This lunar eclipse was the predecessor of the solar eclipse of July 22, 2009. VisibilityIt was predicted to be seen rising over Australia after dusk on July 7 and setting over western North and South America in the early predawn hours of July 7. MapRelated lunar eclipsesLunar year (354 days)This eclipse is one of five lunar eclipses in a short-lived series. The lunar year series repeats after 12 lunations or 354 days (Shifting back about 10 days in sequential years). Because of the date shift, the Earth's shadow will be about 11 degrees west in sequential events. {{Lunar eclipse set 2009-2013}}Saros seriesThis eclipse is a member of Saros series 110. The previous event occurred on June 27, 1991. The next event is on July 18, 2027 which will end the series. Half-Saros cycleA lunar eclipse will be preceded and followed by solar eclipses by 9 years and 5.5 days (a half saros).[2] This lunar eclipse is related to two partial solar eclipses of Solar Saros 117.
See also{{commons category|Lunar eclipse of 2009 July 7}}
Notes1. ^Sky&Telescope: "The moon skims through too little of the penumbra to be noticed even by the most intent observer." {{webarchive|url=https://archive.is/20090202042337/http://www.skyandtelescope.com/observing/objects/eclipses/36789564.html |date=February 2, 2009 }} 2. ^Mathematical Astronomy Morsels, Jean Meeus, p.110, Chapter 18, The half-saros External links
2 : 21st-century lunar eclipses|2009 in science |
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