July 1981 lunar eclipse
Template:Short description Template:Infobox lunar eclipse A partial lunar eclipse occurred at the Moon’s descending node of orbit on Friday, July 17, 1981,[1] with an umbral magnitude of 0.5486. 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 5.4 days after apogee (on July 11, 1981, at 18:35 UTC), the Moon's apparent diameter was smaller.[2]
Visibility
The eclipse was completely visible over central and eastern North America, South America, and Antarctica, seen rising over western North America and the central Pacific Ocean and setting over much of Europe, Africa, and the Middle East.[3]
| File:Lunar eclipse from moon-1981Jul17.png File:Lunar eclipse chart close-1981Jul17.png |
Eclipse details
Shown below is a table displaying details about this particular solar eclipse. It describes various parameters pertaining to this eclipse.[4]
| Parameter | Value |
|---|---|
| Penumbral Magnitude | 1.58223 |
| Umbral Magnitude | 0.54860 |
| Gamma | 0.70454 |
| Sun Right Ascension | 07h45m44.1s |
| Sun Declination | +21°13'06.1" |
| Sun Semi-Diameter | 15'44.2" |
| Sun Equatorial Horizontal Parallax | 08.7" |
| Moon Right Ascension | 19h45m30.8s |
| Moon Declination | -20°33'51.6" |
| Moon Semi-Diameter | 15'13.5" |
| Moon Equatorial Horizontal Parallax | 0°55'52.6" |
| ΔT | 51.9 s |
Eclipse season
Script error: No such module "Labelled list hatnote". 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.
| July 17 Descending node (full moon) |
July 31 Ascending node (new moon) |
|---|---|
| File:Lunar eclipse chart close-1981Jul17.png | File:SE1981Jul31T.png |
| Partial lunar eclipse Lunar Saros 119 |
Total solar eclipse Solar Saros 145 |
Related eclipses
Eclipses in 1981
- A penumbral lunar eclipse on January 20.
- An annular solar eclipse on February 4.
- A partial lunar eclipse on July 17.
- A total solar eclipse on July 31.
Metonic
- Preceded by: Lunar eclipse of September 27, 1977
- Followed by: Lunar eclipse of May 4, 1985
Tzolkinex
- Preceded by: Lunar eclipse of June 4, 1974
- Followed by: Lunar eclipse of August 27, 1988
Half-Saros
- Preceded by: Solar eclipse of July 10, 1972
- Followed by: Solar eclipse of July 22, 1990
Tritos
- Preceded by: Lunar eclipse of August 17, 1970
- Followed by: Lunar eclipse of June 15, 1992
Lunar Saros 119
- Preceded by: Lunar eclipse of July 6, 1963
- Followed by: Lunar eclipse of July 28, 1999
Inex
- Preceded by: Lunar eclipse of August 5, 1952
- Followed by: Lunar eclipse of June 26, 2010
Triad
- Preceded by: Lunar eclipse of September 15, 1894
- Followed by: Lunar eclipse of May 17, 2068
Lunar eclipses of 1980–1984
Template:Lunar eclipse set 1980-1984
Saros 119
Template:Lunar Saros series 119
Tritos series
Template:Lunar Tritos series May 2003
Inex series
Template:Lunar Inex series June 2010
Half-Saros cycle
A lunar eclipse will be preceded and followed by solar eclipses by 9 years and 5.5 days (a half saros).[5] This lunar eclipse is related to two total solar eclipses of Solar Saros 126.
| July 10, 1972 | July 22, 1990 |
|---|---|
| File:SE1972Jul10T.png | File:SE1990Jul22T.png |
See also
Notes
<templatestyles src="Reflist/styles.css" />
Script error: No such module "Check for unknown parameters".