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A partial lunar eclipse occurred at the Moon’s ascending node of orbit on Saturday, July 4, 1936,[1] with an umbral magnitude of 0.2668. 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. The Moon's apparent diameter was near the average diameter because it occurred 6.8 days after apogee (on June 27, 1936, at 21:30 UTC) and 7.2 days before perigee (on July 11, 1936, at 22:05 UTC).[2]
| Partial eclipse | |||||||||||||
 The Moon's hourly motion shown right to left | |||||||||||||
| Date | July 4, 1936 | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Gamma | 0.8642 | ||||||||||||
| Magnitude | 0.2668 | ||||||||||||
| Saros cycle | 138 (25 of 83) | ||||||||||||
| Partiality | 116 minutes, 18 seconds | ||||||||||||
| Penumbral | 289 minutes, 31 seconds | ||||||||||||
| |||||||||||||
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The eclipse was completely visible over south and east Asia, Australia, and Antarctica, seen rising over Africa, Europe, and west and central Asia and setting over northeast Asia and the central Pacific Ocean.[3]
 |
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 | 1.27781 |
| Umbral Magnitude | 0.26679 |
| Gamma | 0.86423 |
| Sun Right Ascension | 06h54m24.6s |
| Sun Declination | +22°51'29.8" |
| Sun Semi-Diameter | 15'43.8" |
| Sun Equatorial Horizontal Parallax | 08.6" |
| Moon Right Ascension | 18h53m44.0s |
| Moon Declination | -22°03'02.9" |
| Moon Semi-Diameter | 15'33.6" |
| Moon Equatorial Horizontal Parallax | 0°57'06.2" |
| ΔT | 23.8 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.
| June 19 Descending node (new moon) | July 4 Ascending node (full moon) |
|---|---|
 | |
| Total solar eclipse Solar Saros 126 | Partial lunar eclipse Lunar Saros 138 |
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Eclipses in 1936
- A total lunar eclipse on January 8.
- A total solar eclipse on June 19.
- A partial lunar eclipse on July 4.
- An annular solar eclipse on December 13.
- A penumbral lunar eclipse on December 28.
Metonic
- Preceded by: Lunar eclipse of September 14, 1932
- Followed by: Lunar eclipse of April 22, 1940
Tzolkinex
- Preceded by: Lunar eclipse of May 23, 1929
- Followed by: Lunar eclipse of August 15, 1943
Half-Saros
- Preceded by: Solar eclipse of June 29, 1927
- Followed by: Solar eclipse of July 9, 1945
Tritos
- Preceded by: Lunar eclipse of August 4, 1925
- Followed by: Lunar eclipse of June 3, 1947
Lunar Saros 138
- Preceded by: Lunar eclipse of June 24, 1918
- Followed by: Lunar eclipse of July 16, 1954
Inex
- Preceded by: Lunar eclipse of July 25, 1907
- Followed by: Lunar eclipse of June 14, 1965
Triad
- Preceded by: Lunar eclipse of September 2, 1849
- Followed by: Lunar eclipse of May 5, 2023
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 | ||||
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 145.
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