August 1990 lunar eclipse
A partial lunar eclipse occurred at the Moon’s ascending node of orbit on Monday, August 6, 1990, with an umbral magnitude of 0.6766. 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 6.2 days after apogee, the Moon's apparent diameter was smaller.
Visibility
The eclipse was completely visible over east Asia, Australia, and Antarctica, seen rising over much of Asia and east Africa and setting over western North America and the eastern Pacific Ocean.Eclipse details
Shown below is a table displaying details about this particular solar eclipse. It describes various parameters pertaining to this eclipse.| Parameter | Value |
| Penumbral Magnitude | 1.70047 |
| Umbral Magnitude | 0.67658 |
| Gamma | 0.63741 |
| Sun Right Ascension | 09h05m18.6s |
| Sun Declination | +16°40'08.3" |
| Sun Semi-Diameter | 15'46.2" |
| Sun Equatorial Horizontal Parallax | 08.7" |
| Moon Right Ascension | 21h04m21.5s |
| Moon Declination | -16°06'49.0" |
| Moon Semi-Diameter | 15'24.1" |
| Moon Equatorial Horizontal Parallax | 0°56'31.6" |
| ΔT | 57.3 s |
Eclipse season
This eclipse is part of an eclipse season, a period, roughly every six months, when eclipses occur. Only two eclipse seasons occur each year, and each season lasts about 35 days and repeats just short of six months 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 22, 1990|July 22] Descending node | August 6 Ascending node |
| Total solar eclipse Solar Saros 126 | Partial lunar eclipse Lunar Saros 138 |
Related eclipses
Eclipses in 1990
- Solar eclipse of [January 26, 1990|An annular solar eclipse on January 26].
- A total lunar eclipse on February 9.
- A total solar eclipse on July 22.
- '''A partial lunar eclipse on August 6.'''
Metonic
- Preceded by: Lunar eclipse of October 17, 1986
- Followed by: Lunar eclipse of May 25, 1994
Tzolkinex
- Preceded by: Lunar eclipse of June 25, 1983
- Followed by: Lunar eclipse of September 16, 1997
Half-Saros
- Preceded by: Solar eclipse of [July 31, 1981]
- Followed by: Solar eclipse of August 11, 1999
Tritos
- Preceded by: Lunar eclipse of September 6, 1979
- Followed by: Lunar eclipse of July 5, 2001
Lunar Saros 138
- Preceded by: Lunar eclipse of July 26, 1972
- Followed by: Lunar eclipse of August 16, 2008
Inex
- Preceded by: Lunar eclipse of August 26, 1961
- Followed by: Lunar eclipse of July 16, 2019
Triad
- Preceded by: Lunar eclipse of October 6, 1903
- Followed by: Lunar eclipse of June 6, 2077
Half-Saros cycle
A lunar eclipse will be preceded and followed by solar eclipses by 9 years and 5.5 days. This lunar eclipse is related to two total solar eclipses of Solar Saros 145.| July 31, 1981 | August 11, 1999 |