April 1940 lunar eclipse
A penumbral lunar eclipse occurred at the Moon’s ascending node of orbit on Monday, April 22, 1940, with an umbral magnitude of −0.0945. 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 2.7 days after perigee, the Moon's apparent diameter was larger.
Visibility
The eclipse was completely visible over much of North America, South America, west Africa, and Antarctica, seen rising over northwestern North America and the central Pacific Ocean and setting over Africa, Europe, and the Middle East.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 | 0.86836 |
| Umbral Magnitude | −0.09446 |
| Gamma | 1.07414 |
| Sun Right Ascension | 01h58m53.2s |
| Sun Declination | +12°08'03.3" |
| Sun Semi-Diameter | 15'54.5" |
| Sun Equatorial Horizontal Parallax | 08.7" |
| Moon Right Ascension | 14h00m00.5s |
| Moon Declination | -11°05'02.6" |
| Moon Semi-Diameter | 16'31.3" |
| Moon Equatorial Horizontal Parallax | 1°00'38.2" |
| ΔT | 24.5 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.| March 23 Ascending node | April 7 Descending node | April 22 Ascending node |
| Penumbral lunar eclipse Lunar Saros 102 | Annular solar eclipse Solar Saros 128 | Penumbral lunar eclipse Lunar Saros 140 |
Related eclipses
Eclipses in 1940
- A penumbral lunar eclipse on March 23.
- An annular solar eclipse on April 7.
- A penumbral lunar eclipse on April 22.
- A total solar eclipse on October 1.
- A penumbral lunar eclipse on October 16.
Metonic
- Preceded by: Lunar eclipse of July 4, 1936
- Followed by: Lunar eclipse of February 9, 1944
Tzolkinex
- Preceded by: Lunar eclipse of March 12, 1933
- Followed by: Lunar eclipse of June 3, 1947
Half-Saros
- Preceded by: Solar eclipse of April 18, 1931
- Followed by: Solar eclipse of April 28, 1949
Tritos
- Preceded by: Lunar eclipse of May 23, 1929
- Followed by: Lunar eclipse of March 23, 1951
Lunar Saros 140
- Preceded by: Lunar eclipse of April 11, 1922
- Followed by: Lunar eclipse of May 3, 1958
Inex
- Preceded by: Lunar eclipse of May 13, 1911
- Followed by: Lunar eclipse of April 2, 1969
Triad
- Preceded by: Lunar eclipse of June 21, 1853
- Followed by: Lunar eclipse of February 20, 2027
Lunar eclipses of 1937–1940
Saros 140
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. This lunar eclipse is related to two partial solar eclipses of Solar Saros 147.| April 18, 1931 | April 28, 1949 |