A partial lunar eclipse will occur at the Moon’s descending node of orbit on Saturday, August 7, 2055, with an umbral magnitude of 0.9606. A lunar eclipse occurs when the Moon moves into the Earth's shadow, causing the Moon to be darkened. A partial lunar eclipse occurs when one part of the Moon is in the Earth's umbra, while the other part is in 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 4.4 days before apogee (on August 11, 2055, at 21:00 UTC), the Moon's apparent diameter will be smaller.
This lunar eclipse will be the last of an almost tetrad, with the others being on February 22, 2054 (total); August 18, 2054 (total); and February 11, 2055 (total).
The eclipse will last 3 hours, 23 minutes, and 23 seconds, and it will also be the last of the first set of partial eclipses in Lunar Saros 139.
Visibility The eclipse will be completely visible over eastern Australia, Antarctica, and the central and eastern Pacific Ocean, seen rising over east Asia and western Australia and setting over North and South America.
Eclipse details Shown below is a table displaying details about this particular solar eclipse. It describes various parameters pertaining to this eclipse.
+August 7, 2055 Lunar Eclipse Parameters Parameter Value Penumbral Magnitude 2.00808 Umbral Magnitude 0.96059 Gamma −0.47690 Sun Right Ascension 09h09m39.9s Sun Declination +16°20'36.9" Sun Semi-Diameter 15'46.2" Sun Equatorial Horizontal Parallax 08.7" Moon Right Ascension 21h10m01.5s Moon Declination -16°46'26.9" Moon Semi-Diameter 15'03.3" Moon Equatorial Horizontal Parallax 0°55'15.1" ΔT 88.8 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.
+ Eclipse season of July–August 2055 July 24Ascending node (new moon) August 7Descending node (full moon) Total solar eclipseSolar Saros 127 Partial lunar eclipseLunar Saros 139
Related eclipses Eclipses in 2055 A partial solar eclipse on January 27. A total lunar eclipse on February 11. A total solar eclipse on July 24. A partial lunar eclipse on August 7.
Metonic Preceded by: Lunar eclipse of October 19, 2051 Followed by: Lunar eclipse of May 27, 2059
Tzolkinex Preceded by: Lunar eclipse of June 26, 2048 Followed by: Lunar eclipse of September 18, 2062
Half-Saros Preceded by: Solar eclipse of August 2, 2046 Followed by: Solar eclipse of August 12, 2064
Tritos Preceded by: Lunar eclipse of September 7, 2044 Followed by: Lunar eclipse of July 7, 2066
Lunar Saros 139 Preceded by: Lunar eclipse of July 27, 2037 Followed by: Lunar eclipse of August 17, 2073
Inex Preceded by: Lunar eclipse of August 28, 2026 Followed by: Lunar eclipse of July 17, 2084
Triad Preceded by: Lunar eclipse of October 6, 1968 Followed by: Lunar eclipse of June 8, 2142
Lunar eclipses of 2053–2056
Saros 139
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 total solar eclipses of Solar Saros 146.
August 2, 2046August 12, 2064
References