May 1984 lunar eclipse
A penumbral lunar eclipse occurred at the Moon’s descending node of orbit on Tuesday, May 15, 1984, with an umbral magnitude of −0.1759. A lunar eclipse occurs when the Moon moves into the Earth's shadow, causing the Moon to be darkened. A penumbral lunar eclipse occurs when part or all of the Moon's near side passes into 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 3 days after perigee, the Moon's apparent diameter was larger.
Visibility
The eclipse was completely visible over much of North America, South America, and Antarctica, seen rising over northwestern North America and the central Pacific Ocean and setting over Africa and much of Europe.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 | 0.80710 |
| Umbral Magnitude | −0.17593 |
| Gamma | 1.11308 |
| Sun Right Ascension | 03h28m40.8s |
| Sun Declination | +18°54'19.8" |
| Sun Semi-Diameter | 15'49.2" |
| Sun Equatorial Horizontal Parallax | 08.7" |
| Moon Right Ascension | 15h30m13.7s |
| Moon Declination | -17°52'23.9" |
| Moon Semi-Diameter | 16'05.6" |
| Moon Equatorial Horizontal Parallax | 0°59'03.7" |
| ΔT | 54.0 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. The first and last eclipse in this sequence is separated by one synodic month.| May 15 Descending node | May 30 Ascending node | June 13 Descending node |
| Penumbral lunar eclipse Lunar Saros 111 | Annular solar eclipse Solar Saros 137 | Penumbral lunar eclipse Lunar Saros 149 |
Related eclipses
Eclipses in 1984
A penumbral lunar eclipse on May 15.- An annular solar eclipse on May 30.
- A penumbral lunar eclipse on June 13.
- A penumbral lunar eclipse on November 8.
- A total solar eclipse on November 22.
Metonic
- Preceded by: Lunar eclipse of July 27, 1980
- Followed by: Lunar eclipse of March 3, 1988
Tzolkinex
- Preceded by: Lunar eclipse of April 4, 1977
- Followed by: Lunar eclipse of June 27, 1991
Half-Saros
- Preceded by: Solar eclipse of May 11, 1975
- Followed by: Solar eclipse of May 21, 1993
Tritos
- Preceded by: Lunar eclipse of June 15, 1973
- Followed by: Lunar eclipse of April 15, 1995
Lunar Saros 111
- Preceded by: Lunar eclipse of May 4, 1966
- Followed by: Lunar eclipse of May 26, 2002
Inex
- Preceded by: Lunar eclipse of June 5, 1955
- Followed by: Lunar eclipse of April 25, 2013
Triad
- Preceded by: Lunar eclipse of July 14, 1897
- Followed by: Lunar eclipse of March 16, 2071
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 partial solar eclipses of Solar Saros 118.| May 11, 1975 | May 21, 1993 |