A partial lunar eclipse occurred at the Moon’s descending node of orbit on Wednesday, July 28, 1999, with an umbral magnitude of 0.3966. 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 5.2 days after apogee (on July 23, 1999, at 6:45 UTC), the Moon's apparent diameter was smaller.
Visibility The eclipse was completely visible over eastern Australia, Antarctica, and much of the Pacific Ocean, seen rising over east and southeast Asia and western Australia and setting over much of 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.
+July 28, 1999 Lunar Eclipse Parameters Parameter Value Penumbral Magnitude 1.43423 Umbral Magnitude 0.39658 Gamma 0.78630 Sun Right Ascension 08h29m15.8s Sun Declination +19°01'23.5" Sun Semi-Diameter 15'45.0" Sun Equatorial Horizontal Parallax 08.7" Moon Right Ascension 20h28m49.2s Moon Declination -18°18'03.0" Moon Semi-Diameter 15'10.7" Moon Equatorial Horizontal Parallax 0°55'42.5" ΔT 63.7 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 1999 July 28Descending node (full moon) August 11Ascending node (new moon) Partial lunar eclipseLunar Saros 119 Total solar eclipseSolar Saros 145
Related eclipses Eclipses in 1999 A penumbral lunar eclipse on January 31. An annular solar eclipse on February 16. A partial lunar eclipse on July 28. A total solar eclipse on August 11.
Metonic Preceded by: Lunar eclipse of October 8, 1995 Followed by: Lunar eclipse of May 16, 2003
Tzolkinex Preceded by: Lunar eclipse of June 15, 1992 Followed by: Lunar eclipse of September 7, 2006
Half-Saros Preceded by: Solar eclipse of July 22, 1990 Followed by: Solar eclipse of August 1, 2008
Tritos Preceded by: Lunar eclipse of August 27, 1988 Followed by: Lunar eclipse of June 26, 2010
Lunar Saros 119 Preceded by: Lunar eclipse of July 17, 1981 Followed by: Lunar eclipse of August 7, 2017
Inex Preceded by: Lunar eclipse of August 17, 1970 Followed by: Lunar eclipse of July 6, 2028
Triad Preceded by: Lunar eclipse of September 26, 1912 Followed by: Lunar eclipse of May 28, 2086
Lunar eclipses of 1998–2002
Saros 119
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 126. July 22, 1990August 1, 2008
See also List of lunar eclipses List of 20th-century lunar eclipses
References
External links Saros cycle 119 Partial Lunar Eclipse 28 July 1999