Solar eclipse of March 18, 1950

Solar eclipse of March 18, 1950
Map
Type of eclipse
NatureAnnular
Gamma0.9988
Magnitude0.962
Maximum eclipse
Duration-
Coordinates60°54′S 40°54′E / 60.9°S 40.9°E / -60.9; 40.9
Max. width of band- km
Times (UTC)
Greatest eclipse15:32:01
References
Saros119 (62 of 71)
Catalog # (SE5000)9398

An annular solar eclipse occurred at the Moon's ascending node of orbit on Saturday, March 18, 1950,[1] with a magnitude of 0.962. 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 3.8 days before apogee (on March 22, 1950, at 10:50 UTC), the Moon's apparent diameter was smaller.[2]

It was unusual in that while it is an annular solar eclipse, it is not a central solar eclipse. A non-central eclipse is one where the center-line of annularity or totality, whatever it is, does not intersect the surface of the Earth (when the gamma is between 0.9972 and 1.0260). This rare type occurs when annularity is only visible at sunset or sunrise in a polar region.

Annularity was visible from a part of Antarctica. A partial eclipse was visible for extreme southern South America, Antarctica, and Southern Africa. This was the last of 54 umbral solar eclipses in Solar Saros 119.

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]

March 18, 1950 Solar Eclipse Times
Event Time (UTC)
First Penumbral External Contact 1950 March 18 at 13:11:15.9 UTC
Equatorial Conjunction 1950 March 18 at 14:27:07.9 UTC
First Umbral External Contact 1950 March 18 at 15:09:02.7 UTC
Ecliptic Conjunction 1950 March 18 at 15:20:29.9 UTC
Greatest Eclipse 1950 March 18 at 15:32:01.3 UTC
Last Umbral External Contact 1950 March 18 at 15:55:41.2 UTC
Last Penumbral External Contact 1950 March 18 at 17:53:16.2 UTC
March 18, 1950 Solar Eclipse Parameters
Parameter Value
Eclipse Magnitude 0.96198
Eclipse Obscuration -
Gamma −0.99880
Sun Right Ascension 23h50m43.1s
Sun Declination -01°00'22.1"
Sun Semi-Diameter 16'03.9"
Sun Equatorial Horizontal Parallax 08.8"
Moon Right Ascension 23h52m29.2s
Moon Declination -01°48'04.0"
Moon Semi-Diameter 14'55.6"
Moon Equatorial Horizontal Parallax 0°54'47.0"
ΔT 29.2 s

Eclipse season

See also: Eclipse cycle

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.

Eclipse season of March–April 1950
March 18
Ascending node (new moon)		 April 2
Descending node (full moon)
Annular solar eclipse
Solar Saros 119		 Total lunar eclipse
Lunar Saros 131

Eclipses in 1950

Metonic

Tzolkinex

Half-Saros

Tritos

Solar Saros 119

Inex

Triad

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.[4]

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 119

This eclipse is a part of Saros series 119, repeating every 18 years, 11 days, and containing 71 events. The series started with a partial solar eclipse on May 15, 850 AD. It contains total eclipses on August 9, 994 AD and August 20, 1012; a hybrid eclipse on August 31, 1030; and annular eclipses from September 10, 1048 through March 18, 1950. The series ends at member 71 as a partial eclipse on June 24, 2112. 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 10 at 32 seconds on August 20, 1012, and the longest duration of annularity was produced by member 44 at 7 minutes, 37 seconds on September 1, 1625. All eclipses in this series occur at the Moon’s ascending node of orbit.[5]

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.

22 eclipse events between January 5, 1935 and August 11, 2018
January 4–5 October 23–24 August 10–12 May 30–31 March 18–19
111 113 115 117 119

January 5, 1935
August 12, 1942
May 30, 1946
March 18, 1950
121 123 125 127 129

January 5, 1954
October 23, 1957
August 11, 1961
May 30, 1965
March 18, 1969
131 133 135 137 139

January 4, 1973
October 23, 1976
August 10, 1980
May 30, 1984
March 18, 1988
141 143 145 147 149

January 4, 1992
October 24, 1995
August 11, 1999
May 31, 2003
March 19, 2007
151 153 155

January 4, 2011
October 23, 2014
August 11, 2018

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

March 25, 1819
(Saros 107)
February 23, 1830
(Saros 108)
January 22, 1841
(Saros 109)
November 21, 1862
(Saros 111)

August 20, 1895
(Saros 114)
July 21, 1906
(Saros 115)
June 19, 1917
(Saros 116)

May 19, 1928
(Saros 117)
April 19, 1939
(Saros 118)
March 18, 1950
(Saros 119)
February 15, 1961
(Saros 120)
January 16, 1972
(Saros 121)

December 15, 1982
(Saros 122)
November 13, 1993
(Saros 123)
October 14, 2004
(Saros 124)
September 13, 2015
(Saros 125)
August 12, 2026
(Saros 126)

July 13, 2037
(Saros 127)
June 11, 2048
(Saros 128)
May 11, 2059
(Saros 129)
April 11, 2070
(Saros 130)
March 10, 2081
(Saros 131)

February 7, 2092
(Saros 132)
January 8, 2103
(Saros 133)
December 8, 2113
(Saros 134)
November 6, 2124
(Saros 135)
October 7, 2135
(Saros 136)

September 6, 2146
(Saros 137)
August 5, 2157
(Saros 138)
July 5, 2168
(Saros 139)
June 5, 2179
(Saros 140)
May 4, 2190
(Saros 141)

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

June 26, 1805
(Saros 114)
June 7, 1834
(Saros 115)
May 17, 1863
(Saros 116)

April 26, 1892
(Saros 117)
April 8, 1921
(Saros 118)
March 18, 1950
(Saros 119)

February 26, 1979
(Saros 120)
February 7, 2008
(Saros 121)
January 16, 2037
(Saros 122)

December 27, 2065
(Saros 123)
December 7, 2094
(Saros 124)
November 18, 2123
(Saros 125)

October 28, 2152
(Saros 126)
October 8, 2181
(Saros 127)

Notes

  1. ^ "March 18, 1950 Annular Solar Eclipse". timeanddate. Retrieved 4 August 2024.
  2. ^ "Moon Distances for London, United Kingdom, England". timeanddate. Retrieved 4 August 2024.
  3. ^ "Annular Solar Eclipse of 1950 Mar 18". EclipseWise.com. Retrieved 4 August 2024.
  4. ^ van Gent, R.H. "Solar- and Lunar-Eclipse Predictions from Antiquity to the Present". A Catalogue of Eclipse Cycles. Utrecht University. Retrieved 6 October 2018.
  5. ^ "NASA - Catalog of Solar Eclipses of Saros 119". eclipse.gsfc.nasa.gov.

References

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