July 1999 lunar eclipse
{{Short description|Partial lunar eclipse July 28, 1999}}
{{Infobox lunar eclipse
| type = partial
| image = Lunar eclipse chart close-1999Jul28.png
| caption = The Moon's hourly motion shown right to left
| date = July 28, 1999
| gamma = 0.7863
| magnitude = 0.3966
| saros_ser = 119
| saros_no = 61 of 83
| partiality = 142 minutes, 32 seconds
| penumbral = 310 minutes, 56 seconds
| p1 = 8:58:15
| u1 = 10:22:31
| greatest = 11:33:43
| u4 = 12:45:03
| p4 = 14:09:11
| previous = January 1999
| next = January 2000
}}
A partial lunar eclipse occurred at the Moon’s descending node of orbit on Wednesday, July 28, 1999,{{cite web|title=July 27–28, 1999 Partial Lunar Eclipse|url=https://www.timeanddate.com/eclipse/lunar/1999-july-28|publisher=timeanddate|access-date=9 January 2025}} 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.{{cite web|title=Moon Distances for London, United Kingdom, England|url=https://www.timeanddate.com/astronomy/moon/distance.html?year=1999&n=136|publisher=timeanddate|access-date=9 January 2025}}
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.{{cite web|title=Partial Lunar Eclipse of 1999 Jul 28|url=https://eclipse.gsfc.nasa.gov/LEplot/LEplot1951/LE1999Jul28P.pdf|publisher=NASA|access-date=9 January 2025}}
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Eclipse details
Shown below is a table displaying details about this particular solar eclipse. It describes various parameters pertaining to this eclipse.{{cite web|title=Partial Lunar Eclipse of 1999 Jul 28|url=https://eclipsewise.com/lunar/LEprime/1901-2000/LE1999Jul28Pprime.html|publisher=EclipseWise.com|access-date=9 January 2025}}
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|+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 |
{{clear}}
Eclipse season
{{See also|Eclipse cycle}}
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.
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|+ Eclipse season of July–August 1999 ! July 28 | |
| 200px | 200px |
| align=center
| Partial lunar eclipse | Total solar eclipse Solar 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 =
{{Lunar_eclipse_set_1998-2002}}
= Saros 119 =
{{Lunar Saros series 119}}
= Tritos series =
{{Lunar Tritos series June 2010}}
= Inex series =
{{Lunar Inex series July 2028}}
= 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.
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| 240px |
See also
References
External links
- [http://www.hermit.org/eclipse/gen_stats.cgi?mode=query&page=full&qtype=type&body=L&saros=119 Saros cycle 119]
- [http://www.starrynightphotos.com/moon/eclipse_99.htm Partial Lunar Eclipse 28 July 1999]
- {{LEplot1951 link|1999|Jul|28|P}}
{{Lunar eclipses}}
{{DEFAULTSORT:Lunar eclipse 1999-07}}
{{lunar-eclipse-stub}}