Solar eclipse of September 12, 1950
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A total solar eclipse occurred at the Moon's descending node of orbit between Monday, September 11, 1950 and Tuesday, September 12, 1950, with a magnitude of 1.0182. 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 3.2 days before perigee (on September 15, 1950, at 8:20 UTC), the Moon's apparent diameter was larger.
Totality was visible from eastern Soviet Union (today's Russia) on September 12 local time and the whole Semichi Islands in Alaska on September 11 local time. A partial eclipse was visible for parts of Northeast Asia, Alaska, Hawaii, and northwest Canada.
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.
| Event | Time (UTC) |
|---|---|
| First Penumbral External Contact | 1950 September 12 at 01:23:43.1 UTC |
| Equatorial Conjunction | 1950 September 12 at 02:46:30.5 UTC |
| First Umbral External Contact | 1950 September 12 at 02:50:01.6 UTC |
| First Central Line | 1950 September 12 at 02:50:40.3 UTC |
| First Umbral Internal Contact | 1950 September 12 at 02:51:19.4 UTC |
| Ecliptic Conjunction | 1950 September 12 at 03:29:21.7 UTC |
| Greatest Eclipse | 1950 September 12 at 03:38:46.9 UTC |
| Greatest Duration | 1950 September 12 at 03:40:16.3 UTC |
| Last Umbral Internal Contact | 1950 September 12 at 04:26:44.1 UTC |
| Last Central Line | 1950 September 12 at 04:27:25.6 UTC |
| Last Umbral External Contact | 1950 September 12 at 04:28:06.7 UTC |
| Last Penumbral External Contact | 1950 September 12 at 05:54:06.6 UTC |
| Parameter | Value |
|---|---|
| Eclipse Magnitude | 1.01818 |
| Eclipse Obscuration | 1.03668 |
| Gamma | 0.89030 |
| Sun Right Ascension | 11h18m51.6s |
| Sun Declination | +04°25'42.1" |
| Sun Semi-Diameter | 15'53.5" |
| Sun Equatorial Horizontal Parallax | 08.7" |
| Moon Right Ascension | 11h20m32.5s |
| Moon Declination | +05°11'38.3" |
| Moon Semi-Diameter | 16'04.0" |
| Moon Equatorial Horizontal Parallax | 0°58'57.9" |
| ΔT | 29.4 s |
Eclipse season
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.
| September 12 Descending node (new moon) | September 26 Ascending node (full moon) |
|---|---|
| Total solar eclipse Solar Saros 124 | Total lunar eclipse Lunar Saros 136 |
Related eclipses
Eclipses in 1950
- A non-central annular solar eclipse on March 18.
- A total lunar eclipse on April 2.
- A total solar eclipse on September 12.
- A total lunar eclipse on September 26.
Metonic
- Preceded by: Solar eclipse of November 23, 1946
- Followed by: Solar eclipse of June 30, 1954
Tzolkinex
- Preceded by: Solar eclipse of August 1, 1943
- Followed by: Solar eclipse of October 23, 1957
Half-Saros
- Preceded by: Lunar eclipse of September 5, 1941
- Followed by: Lunar eclipse of September 17, 1959
Tritos
- Preceded by: Solar eclipse of October 12, 1939
- Followed by: Solar eclipse of August 11, 1961
Solar Saros 124
- Preceded by: Solar eclipse of August 31, 1932
- Followed by: Solar eclipse of September 22, 1968
Inex
- Preceded by: Solar eclipse of October 1, 1921
- Followed by: Solar eclipse of August 22, 1979
Triad
- Preceded by: Solar eclipse of November 11, 1863
- Followed by: Solar eclipse of July 13, 2037
Solar eclipses of 1950–1953
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.
The partial solar eclipse on July 11, 1953 occurs in the next lunar year eclipse set.
| Solar eclipse series sets from 1950 to 1953 | |||||
|---|---|---|---|---|---|
| Ascending node | Descending node | ||||
| Saros | Map | Gamma | Saros | Map | Gamma |
| 119 | March 18, 1950 Annular (non-central) | 0.9988 | 124 | September 12, 1950 Total | 0.8903 |
| 129 | March 7, 1951 Annular | −0.242 | 134 | September 1, 1951 Annular | 0.1557 |
| 139 | February 25, 1952 Total | 0.4697 | 144 | August 20, 1952 Annular | −0.6102 |
| 149 | February 14, 1953 Partial | 1.1331 | 154 | August 9, 1953 Partial | −1.344 |
Saros 124
This eclipse is a part of Saros series 124, repeating every 18 years, 11 days, and containing 73 events. The series started with a partial solar eclipse on March 6, 1049. It contains total eclipses from June 12, 1211 through September 22, 1968, and a hybrid eclipse on October 3, 1986. There are no annular eclipses in this set. The series ends at member 73 as a partial eclipse on May 11, 2347. 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 39 at 5 minutes, 46 seconds on May 3, 1734. All eclipses in this series occur at the Moon’s descending node of orbit.
| Series members 43–64 occur between 1801 and 2200: | ||
|---|---|---|
| 43 | 44 | 45 |
| June 16, 1806 | June 26, 1824 | July 8, 1842 |
| 46 | 47 | 48 |
| July 18, 1860 | July 29, 1878 | August 9, 1896 |
| 49 | 50 | 51 |
| August 21, 1914 | August 31, 1932 | September 12, 1950 |
| 52 | 53 | 54 |
| September 22, 1968 | October 3, 1986 | October 14, 2004 |
| 55 | 56 | 57 |
| October 25, 2022 | November 4, 2040 | November 16, 2058 |
| 58 | 59 | 60 |
| November 26, 2076 | December 7, 2094 | December 19, 2112 |
| 61 | 62 | 63 |
| December 30, 2130 | January 9, 2149 | January 21, 2167 |
| 64 | ||
| January 31, 2185 |
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 descending node.
| 22 eclipse events between September 12, 1931 and July 1, 2011 | ||||
|---|---|---|---|---|
| September 11–12 | June 30–July 1 | April 17–19 | February 4–5 | November 22–23 |
| 114 | 116 | 118 | 120 | 122 |
| September 12, 1931 | June 30, 1935 | April 19, 1939 | February 4, 1943 | November 23, 1946 |
| 124 | 126 | 128 | 130 | 132 |
| September 12, 1950 | June 30, 1954 | April 19, 1958 | February 5, 1962 | November 23, 1965 |
| 134 | 136 | 138 | 140 | 142 |
| September 11, 1969 | June 30, 1973 | April 18, 1977 | February 4, 1981 | November 22, 1984 |
| 144 | 146 | 148 | 150 | 152 |
| September 11, 1988 | June 30, 1992 | April 17, 1996 | February 5, 2000 | November 23, 2003 |
| 154 | 156 | |||
| September 11, 2007 | July 1, 2011 |
Tritos series
This eclipse is a part of a tritos cycle, repeating at alternating nodes every 135 synodic months (≈ 3986.63 days, or 11 years minus 1 month). Their appearance and longitude are irregular due to a lack of synchronization with the anomalistic month (period of perigee), but groupings of 3 tritos cycles (≈ 33 years minus 3 months) come close (≈ 434.044 anomalistic months), so eclipses are similar in these groupings.
| Series members between 1801 and 2200 | ||||
|---|---|---|---|---|
| October 19, 1808 (Saros 111) | September 19, 1819 (Saros 112) | August 18, 1830 (Saros 113) | July 18, 1841 (Saros 114) | June 17, 1852 (Saros 115) |
| May 17, 1863 (Saros 116) | April 16, 1874 (Saros 117) | March 16, 1885 (Saros 118) | February 13, 1896 (Saros 119) | January 14, 1907 (Saros 120) |
| December 14, 1917 (Saros 121) | November 12, 1928 (Saros 122) | October 12, 1939 (Saros 123) | September 12, 1950 (Saros 124) | August 11, 1961 (Saros 125) |
| July 10, 1972 (Saros 126) | June 11, 1983 (Saros 127) | May 10, 1994 (Saros 128) | April 8, 2005 (Saros 129) | March 9, 2016 (Saros 130) |
| February 6, 2027 (Saros 131) | January 5, 2038 (Saros 132) | December 5, 2048 (Saros 133) | November 5, 2059 (Saros 134) | October 4, 2070 (Saros 135) |
| September 3, 2081 (Saros 136) | August 3, 2092 (Saros 137) | July 4, 2103 (Saros 138) | June 3, 2114 (Saros 139) | May 3, 2125 (Saros 140) |
| April 1, 2136 (Saros 141) | March 2, 2147 (Saros 142) | January 30, 2158 (Saros 143) | December 29, 2168 (Saros 144) | November 28, 2179 (Saros 145) |
| October 29, 2190 (Saros 146) |
Inex series
This eclipse is a part of the long period inex cycle, repeating at alternating nodes, every 358 synodic months (≈ 10,571.95 days, or 29 years minus 20 days). Their appearance and longitude are irregular due to a lack of synchronization with the anomalistic month (period of perigee). However, groupings of 3 inex cycles (≈ 87 years minus 2 months) comes close (≈ 1,151.02 anomalistic months), so eclipses are similar in these groupings.
| Series members between 1801 and 2200 | ||
|---|---|---|
| December 21, 1805 (Saros 119) | November 30, 1834 (Saros 120) | November 11, 1863 (Saros 121) |
| October 20, 1892 (Saros 122) | October 1, 1921 (Saros 123) | September 12, 1950 (Saros 124) |
| August 22, 1979 (Saros 125) | August 1, 2008 (Saros 126) | July 13, 2037 (Saros 127) |
| June 22, 2066 (Saros 128) | June 2, 2095 (Saros 129) | May 14, 2124 (Saros 130) |
| April 23, 2153 (Saros 131) | April 3, 2182 (Saros 132) |
Notes
- Eclipse Predictions by Fred Espenak, NASA/GSFC