Solar eclipse of April 7, 1940
Template:Short description Script error: No such module "Solar eclipse". An annular solar eclipse occurred at the Moon's descending node of orbit on Sunday, April 7, 1940,[1] with a magnitude of 0.9394. 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. An annular solar eclipse occurs when the Moon's apparent diameter is smaller than the Sun's, blocking most of the Sun's light and causing the Sun to look like an annulus (ring). An annular eclipse appears as a partial eclipse over a region of the Earth thousands of kilometres wide. Occurring about 2.4 days after apogee (on April 5, 1940, at 10:00 UTC), the Moon's apparent diameter was smaller.[2]
Annularity was visible from Gilbert and Ellice Islands (the part now belonging to Kiribati), Mexico and Texas, Louisiana, Mississippi, Alabama, Georgia, Florida, and South Carolina in the United States. A partial eclipse was visible for parts of eastern Oceania, Hawaii, North America, Central America, the Caribbean, and northern South America.
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 | 1940 April 7 at 17:17:50.2 UTC |
| First Umbral External Contact | 1940 April 7 at 18:23:22.6 UTC |
| First Central Line | 1940 April 7 at 18:26:03.9 UTC |
| First Umbral Internal Contact | 1940 April 7 at 18:28:45.3 UTC |
| First Penumbral Internal Contact | 1940 April 7 at 19:37:26.3 UTC |
| Ecliptic Conjunction | 1940 April 7 at 20:18:43.9 UTC |
| Greatest Eclipse | 1940 April 7 at 20:21:20.8 UTC |
| Greatest Duration | 1940 April 7 at 20:26:12.0 UTC |
| Equatorial Conjunction | 1940 April 7 at 20:29:05.3 UTC |
| Last Penumbral Internal Contact | 1940 April 7 at 21:05:02.9 UTC |
| Last Umbral Internal Contact | 1940 April 7 at 22:13:51.7 UTC |
| Last Central Line | 1940 April 7 at 22:16:31.8 UTC |
| Last Umbral External Contact | 1940 April 7 at 22:19:11.6 UTC |
| Last Penumbral External Contact | 1940 April 7 at 23:24:44.5 UTC |
| Parameter | Value |
|---|---|
| Eclipse Magnitude | 0.93942 |
| Eclipse Obscuration | 0.88252 |
| Gamma | 0.21897 |
| Sun Right Ascension | 01h05m52.5s |
| Sun Declination | +07°00'32.1" |
| Sun Semi-Diameter | 15'58.2" |
| Sun Equatorial Horizontal Parallax | 08.8" |
| Moon Right Ascension | 01h05m38.8s |
| Moon Declination | +07°11'53.1" |
| Moon Semi-Diameter | 14'47.0" |
| Moon Equatorial Horizontal Parallax | 0°54'15.4" |
| ΔT | 24.5 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. The first and last eclipse in this sequence is separated by one synodic month.
| March 23 Ascending node (full moon) |
April 7 Descending node (new moon) |
April 22 Ascending node (full moon) |
|---|---|---|
| File:Lunar eclipse chart close-1940Mar23.png | File:SE1940Apr07A.png | File:Lunar eclipse chart close-1940Apr22.png |
| 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: Solar eclipse of June 19, 1936
- Followed by: Solar eclipse of January 25, 1944
Tzolkinex
- Preceded by: Solar eclipse of February 24, 1933
- Followed by: Solar eclipse of May 20, 1947
Half-Saros
- Preceded by: Lunar eclipse of April 2, 1931
- Followed by: Lunar eclipse of April 13, 1949
Tritos
- Preceded by: Solar eclipse of May 9, 1929
- Followed by: Solar eclipse of March 7, 1951
Solar Saros 128
- Preceded by: Solar eclipse of March 28, 1922
- Followed by: Solar eclipse of April 19, 1958
Inex
- Preceded by: Solar eclipse of April 28, 1911
- Followed by: Solar eclipse of March 18, 1969
Triad
- Preceded by: Solar eclipse of June 6, 1853
- Followed by: Solar eclipse of February 6, 2027
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 128
This eclipse is a part of Saros series 128, repeating every 18 years, 11 days, and containing 73 events. The series started with a partial solar eclipse on August 29, 984 AD. It contains total eclipses from May 16, 1417 through June 18, 1471; hybrid eclipses from June 28, 1489 through July 31, 1543; and annular eclipses from August 11, 1561 through July 25, 2120. The series ends at member 73 as a partial eclipse on November 1, 2282. Its eclipses are tabulated in three columns; every third eclipse in the same column is one exeligmos apart, so they all cast shadows over approximately the same parts of the Earth.
The longest duration of totality was produced by member 27 at 1 minutes, 45 seconds on June 7, 1453, and the longest duration of annularity was produced by member 48 at 8 minutes, 35 seconds on February 1, 1832. All eclipses in this series occur at the Moon’s descending node of orbit.[5]
| Series members 47–68 occur between 1801 and 2200: | ||
|---|---|---|
| 47 | 48 | 49 |
| File:SE1814Jan21A.gif January 21, 1814 |
File:SE1832Feb01A.gif February 1, 1832 |
File:SE1850Feb12A.gif February 12, 1850 |
| 50 | 51 | 52 |
| File:SE1868Feb23A.gif February 23, 1868 |
File:SE1886Mar05A.gif March 5, 1886 |
File:SE1904Mar17A.png March 17, 1904 |
| 53 | 54 | 55 |
| File:SE1922Mar28A.png March 28, 1922 |
File:SE1940Apr07A.png April 7, 1940 |
File:SE1958Apr19A.png April 19, 1958 |
| 56 | 57 | 58 |
| File:SE1976Apr29A.png April 29, 1976 |
File:SE1994May10A.png May 10, 1994 |
File:SE2012May20A.png May 20, 2012 |
| 59 | 60 | 61 |
| File:SE2030Jun01A.png June 1, 2030 |
File:SE2048Jun11A.png June 11, 2048 |
File:SE2066Jun22A.png June 22, 2066 |
| 62 | 63 | 64 |
| File:SE2084Jul03A.png July 3, 2084 |
File:SE2102Jul15A.png July 15, 2102 |
File:SE2120Jul25A.png July 25, 2120 |
| 65 | 66 | 67 |
| File:Saros128 65van73 SE2138Aug05P.jpg August 5, 2138 |
File:Saros128 66van73 SE2156Aug16P.jpg August 16, 2156 |
File:Saros128 67van73 SE2174Aug27P.jpg August 27, 2174 |
| 68 | ||
| File:Saros128 68van73 SE2192Sep06P.jpg September 6, 2192 | ||
Metonic series
Template:Solar Metonic series 1902–1989
Tritos series
Template:Solar Tritos series 2005 October 3
Inex series
Template:Solar Inex series 2027 February 6
Notes
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References
- Earth visibility chart and eclipse statistics Eclipse Predictions by Fred Espenak, NASA/GSFC
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