Solar eclipse of October 12, 1939
Template:Short description Script error: No such module "Solar eclipse". A total solar eclipse occurred at the Moon's ascending node of orbit on Thursday, October 12, 1939,[1] with a magnitude of 1.0266. A solar eclipse occurs when the Moon passes between Earth and the Sun, thereby totally or partly obscuring the image of the Sun for a viewer on Earth. A total solar eclipse occurs when the Moon's apparent diameter is larger than the Sun's, blocking all direct sunlight, turning day into darkness. Totality occurs in a narrow path across Earth's surface, with the partial solar eclipse visible over a surrounding region thousands of kilometres wide. Occurring about 1.8 days after perigee (on October 11, 1939, at 2:30 UTC), the Moon's apparent diameter was larger.[2]
Totality was visible for a part of Antarctica. A partial eclipse was visible for parts of Eastern Australia, Oceania, extreme southern South America, and Antarctica.
Eclipse details
Shown below are two tables displaying details about this particular solar eclipse. The first table outlines times at which the moon's penumbra or umbra attains the specific parameter, and the second table describes various other parameters pertaining to this eclipse.[3]
| Event | Time (UTC) |
|---|---|
| First Penumbral External Contact | 1939 October 12 at 18:35:06.1 UTC |
| First Umbral External Contact | 1939 October 12 at 20:14:48.5 UTC |
| First Central Line | 1939 October 12 at 20:17:38.1 UTC |
| First Umbral Internal Contact | 1939 October 12 at 20:20:50.7 UTC |
| Ecliptic Conjunction | 1939 October 12 at 20:30:28.6 UTC |
| Greatest Duration | 1939 October 12 at 20:39:46.3 UTC |
| Greatest Eclipse | 1939 October 12 at 20:40:23.4 UTC |
| Equatorial Conjunction | 1939 October 12 at 21:11:17.5 UTC |
| Last Umbral Internal Contact | 1939 October 12 at 20:59:35.3 UTC |
| Last Central Line | 1939 October 12 at 21:02:46.1 UTC |
| Last Umbral External Contact | 1939 October 12 at 21:05:33.9 UTC |
| Last Penumbral External Contact | 1939 October 12 at 22:45:29.8 UTC |
| Parameter | Value |
|---|---|
| Eclipse Magnitude | 1.02657 |
| Eclipse Obscuration | 1.05385 |
| Gamma | −0.97370 |
| Sun Right Ascension | 13h08m41.4s |
| Sun Declination | -07°17'47.8" |
| Sun Semi-Diameter | 16'01.7" |
| Sun Equatorial Horizontal Parallax | 08.8" |
| Moon Right Ascension | 13h07m33.1s |
| Moon Declination | -08°13'46.1" |
| Moon Semi-Diameter | 16'24.2" |
| Moon Equatorial Horizontal Parallax | 1°00'12.1" |
| ΔT | 24.3 s |
Eclipse season
Script error: No such module "Labelled list hatnote". 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.
| October 12 Ascending node (new moon) |
October 28 Descending node (full moon) |
|---|---|
| File:SE1939Oct12T.png | File:Lunar eclipse chart close-1939Oct28.png |
| Total solar eclipse Solar Saros 123 |
Partial lunar eclipse Lunar Saros 135 |
Related eclipses
Eclipses in 1939
- An annular solar eclipse on April 19.
- A total lunar eclipse on May 3.
- A total solar eclipse on October 12.
- A partial lunar eclipse on October 28.
Metonic
- Preceded by: Solar eclipse of December 25, 1935
- Followed by: Solar eclipse of August 1, 1943
Tzolkinex
- Preceded by: Solar eclipse of August 31, 1932
- Followed by: Solar eclipse of November 23, 1946
Half-Saros
- Preceded by: Lunar eclipse of October 7, 1930
- Followed by: Lunar eclipse of October 18, 1948
Tritos
- Preceded by: Solar eclipse of November 12, 1928
- Followed by: Solar eclipse of September 12, 1950
Solar Saros 123
- Preceded by: Solar eclipse of October 1, 1921
- Followed by: Solar eclipse of October 23, 1957
Inex
- Preceded by: Solar eclipse of November 2, 1910
- Followed by: Solar eclipse of September 22, 1968
Triad
- Preceded by: Solar eclipse of December 11, 1852
- Followed by: Solar eclipse of August 12, 2026
Solar eclipses of 1939–1942
This eclipse is a member of a semester series. An eclipse in a semester series of solar eclipses repeats approximately every 177 days and 4 hours (a semester) at alternating nodes of the Moon's orbit.[4]
The partial solar eclipse on August 12, 1942 occurs in the next lunar year eclipse set.
| Solar eclipse series sets from 1939 to 1942 | ||||||
|---|---|---|---|---|---|---|
| Descending node | Ascending node | |||||
| Saros | Map | Gamma | Saros | Map | Gamma | |
| 118 | April 19, 1939 File:SE1939Apr19A.png Annular |
0.9388 | 123 | October 12, 1939 File:SE1939Oct12T.png Total |
−0.9737 | |
| 128 | April 7, 1940 File:SE1940Apr07A.png Annular |
0.219 | 133 | October 1, 1940 File:SE1940Oct01T.png Total |
−0.2573 | |
| 138 | March 27, 1941 File:SE1941Mar27A.png Annular |
−0.5025 | 143 | September 21, 1941 File:SE1941Sep21T.png Total |
0.4649 | |
| 148 | March 16, 1942 File:SE1942Mar16P.png Partial |
−1.1908 | 153 | September 10, 1942 File:SE1942Sep10P.png Partial |
1.2571 | |
Saros 123
Template:Solar Saros series 123
Metonic series
The metonic series repeats eclipses every 19 years (6939.69 days), lasting about 5 cycles. Eclipses occur in nearly the same calendar date. In addition, the octon subseries repeats 1/5 of that or every 3.8 years (1387.94 days). All eclipses in this table occur at the Moon's ascending node.
Tritos series
Template:Solar Tritos series 2005 April 8
Inex series
Template:Solar Inex series 2026 August 12
Notes
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References
- Earth visibility chart and eclipse statistics Eclipse Predictions by Fred Espenak, NASA/GSFC
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