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A penumbral lunar eclipse occurred at the Moon’s descending node of orbit on Friday, February 10, 1933,[1] with an umbral magnitude of −1.0268. 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. The Moon's apparent diameter was near the average diameter because it occurred 6.7 days after apogee (on February 3, 1933, at 21:10 UTC) and 7.9 days before perigee (on February 18, 1933, at 10:50 UTC).[2]
| Penumbral eclipse | |||||||||
 The Moon's hourly motion shown right to left | |||||||||
| Date | February 10, 1933 | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Gamma | 1.5600 | ||||||||
| Magnitude | −1.0268 | ||||||||
| Saros cycle | 103 (83 of 84) | ||||||||
| Penumbral | 39 minutes, 34 seconds | ||||||||
| |||||||||
This eclipse was the first of four penumbral lunar eclipses in 1933, with the others occurring on March 12, August 5, and September 4.
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The eclipse was completely visible over much of Asia, Australia, and western North America.[3]
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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 | 0.01836 |
| Umbral Magnitude | −1.02680 |
| Gamma | 1.56004 |
| Sun Right Ascension | 21h35m02.2s |
| Sun Declination | -14°22'59.8" |
| Sun Semi-Diameter | 16'12.3" |
| Sun Equatorial Horizontal Parallax | 08.9" |
| Moon Right Ascension | 09h37m33.3s |
| Moon Declination | +15°43'55.4" |
| Moon Semi-Diameter | 15'30.3" |
| Moon Equatorial Horizontal Parallax | 0°56'54.2" |
| ΔT | 23.9 s |
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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. The first and last eclipse in this sequence is separated by one synodic month.
| February 10 Descending node (full moon) | February 24 Ascending node (new moon) | March 12 Descending node (full moon) |
|---|---|---|
|  |  |
| Penumbral lunar eclipse Lunar Saros 103 | Annular solar eclipse Solar Saros 129 | Penumbral lunar eclipse Lunar Saros 141 |
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Eclipses in 1933
- A penumbral lunar eclipse on February 10.
- An annular solar eclipse on February 24.
- A penumbral lunar eclipse on March 12.
- A penumbral lunar eclipse on August 5.
- An annular solar eclipse on August 21.
- A penumbral lunar eclipse on September 4.
Tzolkinex
- Followed by: Lunar eclipse of March 23, 1940
Tritos
- Preceded by: Lunar eclipse of March 13, 1922
Lunar Saros 103
- Preceded by: Lunar eclipse of January 31, 1915
- Followed by: Lunar eclipse of February 21, 1951
Inex
- Preceded by: Lunar eclipse of March 2, 1904
Triad
- Preceded by: Lunar eclipse of April 11, 1846
Lunar eclipses of 1933–1936
| Descending node | Ascending node | |||||
|---|---|---|---|---|---|---|
| Saros | Date Viewing |
Type Chart |
Saros | Date Viewing |
Type Chart | |
| 103 | 1933 Feb 10 |
Penumbral |
108 | 1933 Aug 05 |
Penumbral | |
| 113 | 1934 Jan 30 |
Partial |
118 | 1934 Jul 26 |
Partial | |
| 123 | 1935 Jan 19 |
Total |
128 | 1935 Jul 16 |
Total | |
| 133 | 1936 Jan 08 |
Total |
138 | 1936 Jul 04 |
Partial | |
| 143 | 1936 Dec 28 |
Penumbral | ||||
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