Solar eclipse of February 25, 1952

A total solar eclipse occurred at the Moon's ascending node of orbit on Monday, February 25, 1952,[1][2][3][4][5][6] with a magnitude of 1.0366. 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 1.4 days after perigee (on February 23, 1952, at 22:30 UTC), the Moon's apparent diameter was larger.[7]

Solar eclipse of February 25, 1952
Map
Type of eclipse
NatureTotal
Gamma0.4697
Magnitude1.0366
Maximum eclipse
Duration189 s (3 min 9 s)
Coordinates15°36′N 32°42′E / 15.6°N 32.7°E / 15.6; 32.7
Max. width of band138 km (86 mi)
Times (UTC)
Greatest eclipse9:11:35
References
Saros139 (26 of 71)
Catalog # (SE5000)9402

The path of totality crossed French Equatorial Africa, Belgian Congo, Anglo-Egyptian Sudan, Arabia, Persia and the Soviet Union. A partial eclipse was visible for parts of Africa, Europe, West Asia, Central Asia, and South Asia.

Observations

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Astronomers from various countries started traveling to Khartoum, capital of Anglo-Egyptian Sudan from January 1952. The team of the United States Naval Research Laboratory made studies in radio astronomy, spectrum, luminosity of corona and spectral observations.[8] Teams of the High Altitude Observatory of Harvard University and University of Colorado analyzed the spectrum of the Balmer series in the hydrogen spectral series.[9] In addition, French astronomer Bernard Ferdinand Lyot, who invented the coronagraph that allows observing the solar corona at any time, not limited to total solar eclipses, died of a heart attack in Cairo, Egypt on his way back from observing the total solar eclipse in Sudan.[10]

Eclipse details

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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.[11]

February 25, 1952 Solar Eclipse Times
Event Time (UTC)
First Penumbral External Contact 1952 February 25 at 06:38:16.5 UTC
First Umbral External Contact 1952 February 25 at 07:38:39.4 UTC
First Central Line 1952 February 25 at 07:39:19.4 UTC
First Umbral Internal Contact 1952 February 25 at 07:39:59.5 UTC
Greatest Duration 1952 February 25 at 09:07:12.9 UTC
Greatest Eclipse 1952 February 25 at 09:11:34.8 UTC
Ecliptic Conjunction 1952 February 25 at 09:16:27.1 UTC
Equatorial Conjunction 1952 February 25 at 09:36:51.1 UTC
Last Umbral Internal Contact 1952 February 25 at 10:42:56.4 UTC
Last Central Line 1952 February 25 at 10:43:34.9 UTC
Last Umbral External Contact 1952 February 25 at 10:44:13.4 UTC
Last Penumbral External Contact 1952 February 25 at 11:44:46.4 UTC
February 25, 1952 Solar Eclipse Parameters
Parameter Value
Eclipse Magnitude 1.03660
Eclipse Obscuration 1.07454
Gamma 0.46973
Sun Right Ascension 22h30m04.0s
Sun Declination -09°25'03.8"
Sun Semi-Diameter 16'09.4"
Sun Equatorial Horizontal Parallax 08.9"
Moon Right Ascension 22h29m11.4s
Moon Declination -08°59'49.8"
Moon Semi-Diameter 16'30.0"
Moon Equatorial Horizontal Parallax 1°00'33.5"
ΔT 30.0 s

Eclipse season

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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.

Eclipse season of February 1952
February 11
Descending node (full moon)
February 25
Ascending node (new moon)
   
Partial lunar eclipse
Lunar Saros 113
Total solar eclipse
Solar Saros 139
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Eclipses in 1952

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Metonic

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Tzolkinex

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Half-Saros

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Tritos

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Solar Saros 139

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Inex

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Triad

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Solar eclipses of 1950–1953

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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.[12]

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 139

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This eclipse is a part of Saros series 139, repeating every 18 years, 11 days, and containing 71 events. The series started with a partial solar eclipse on May 17, 1501. It contains hybrid eclipses from August 11, 1627 through December 9, 1825 and total eclipses from December 21, 1843 through March 26, 2601. There are no annular eclipses in this set. The series ends at member 71 as a partial eclipse on July 3, 2763. 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 will be produced by member 61 at 7 minutes, 29.22 seconds on July 16, 2186. This date is the longest solar eclipse computed between 4000 BC and AD 6000.[13] All eclipses in this series occur at the Moon’s ascending node of orbit.[14]

Series members 18–39 occur between 1801 and 2200:
18 19 20
 
November 29, 1807
 
December 9, 1825
 
December 21, 1843
21 22 23
 
December 31, 1861
 
January 11, 1880
 
January 22, 1898
24 25 26
 
February 3, 1916
 
February 14, 1934
 
February 25, 1952
27 28 29
 
March 7, 1970
 
March 18, 1988
 
March 29, 2006
30 31 32
 
April 8, 2024
 
April 20, 2042
 
April 30, 2060
33 34 35
 
May 11, 2078
 
May 22, 2096
 
June 3, 2114
36 37 38
 
June 13, 2132
 
June 25, 2150
 
July 5, 2168
39
 
July 16, 2186

Metonic series

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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 December 13, 1898 and July 20, 1982
December 13–14 October 1–2 July 20–21 May 9 February 24–25
111 113 115 117 119
 
December 13, 1898
 
July 21, 1906
 
May 9, 1910
 
February 25, 1914
121 123 125 127 129
 
December 14, 1917
 
October 1, 1921
 
July 20, 1925
 
May 9, 1929
 
February 24, 1933
131 133 135 137 139
 
December 13, 1936
 
October 1, 1940
 
July 20, 1944
 
May 9, 1948
 
February 25, 1952
141 143 145 147 149
 
December 14, 1955
 
October 2, 1959
 
July 20, 1963
 
May 9, 1967
 
February 25, 1971
151 153 155
 
December 13, 1974
 
October 2, 1978
 
July 20, 1982

Tritos series

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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
 
April 4, 1810
(Saros 126)
 
March 4, 1821
(Saros 127)
 
February 1, 1832
(Saros 128)
 
December 31, 1842
(Saros 129)
 
November 30, 1853
(Saros 130)
 
October 30, 1864
(Saros 131)
 
September 29, 1875
(Saros 132)
 
August 29, 1886
(Saros 133)
 
July 29, 1897
(Saros 134)
 
June 28, 1908
(Saros 135)
 
May 29, 1919
(Saros 136)
 
April 28, 1930
(Saros 137)
 
March 27, 1941
(Saros 138)
 
February 25, 1952
(Saros 139)
 
January 25, 1963
(Saros 140)
 
December 24, 1973
(Saros 141)
 
November 22, 1984
(Saros 142)
 
October 24, 1995
(Saros 143)
 
September 22, 2006
(Saros 144)
 
August 21, 2017
(Saros 145)
 
July 22, 2028
(Saros 146)
 
June 21, 2039
(Saros 147)
 
May 20, 2050
(Saros 148)
 
April 20, 2061
(Saros 149)
 
March 19, 2072
(Saros 150)
 
February 16, 2083
(Saros 151)
 
January 16, 2094
(Saros 152)
 
December 17, 2104
(Saros 153)
 
November 16, 2115
(Saros 154)
 
October 16, 2126
(Saros 155)
 
September 15, 2137
(Saros 156)
 
August 14, 2148
(Saros 157)
 
July 15, 2159
(Saros 158)
 
June 14, 2170
(Saros 159)
 
May 13, 2181
(Saros 160)
 
April 12, 2192
(Saros 161)

Inex series

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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 6, 1807
(Saros 134)
 
May 15, 1836
(Saros 135)
 
April 25, 1865
(Saros 136)
 
April 6, 1894
(Saros 137)
 
March 17, 1923
(Saros 138)
 
February 25, 1952
(Saros 139)
 
February 4, 1981
(Saros 140)
 
January 15, 2010
(Saros 141)
 
December 26, 2038
(Saros 142)
 
December 6, 2067
(Saros 143)
 
November 15, 2096
(Saros 144)
 
October 26, 2125
(Saros 145)
 
October 7, 2154
(Saros 146)
 
September 16, 2183
(Saros 147)

Notes

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  1. ^ "February 25, 1952 Total Solar Eclipse". timeanddate. Retrieved 5 August 2024.
  2. ^ "Today's Total Eclipse May Yield New Facts On Sun's Chemistry And Age". The Vancouver News-Herald. Vancouver, British Columbia, Canada. 1952-02-26. p. 4. Retrieved 2023-10-17 – via Newspapers.com.
  3. ^ "Eclipse Studied in Sudan to Test Einstein's Theory". Richmond Times-Dispatch. Richmond, Virginia. 1952-02-26. p. 15. Retrieved 2023-10-17 – via Newspapers.com.
  4. ^ "'PERFECT' CONDITIONS FOR TOTAL ECLIPSE OF THE SUN". The Guardian. London, Greater London, England. 1952-02-26. p. 5. Retrieved 2023-10-17 – via Newspapers.com.
  5. ^ "Scientists View Total Sun Eclipse". The News. Frederick, Maryland. 1952-02-26. p. 1. Retrieved 2023-10-17 – via Newspapers.com.
  6. ^ "Top Scientists Get Rare Glimpse of Full Eclipse". St. Louis Globe-Democrat. St. Louis, Missouri. 1952-02-26. p. 1. Retrieved 2023-10-17 – via Newspapers.com.
  7. ^ "Moon Distances for London, United Kingdom, England". timeanddate. Retrieved 5 August 2024.
  8. ^ M. K. Aly (April 1952). "Khartoum expeditions for total solar eclipse of February 25th, 1952". The Observatory. 72: 63–72. Archived from the original on 6 April 2017.
  9. ^ Athay, R. G., Billings, D. E., Evans, J. W., & Roberts, W. O. "Emission in Hydrogen Balmer Lines and Continuum in Flash Spectrum of 1952 Total Solar Eclipse at Khartoum, Sudan". The Astrophysical Journal. 120: 94–111. Archived from the original on 6 April 2017.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  10. ^ "Bernard Lyot (1897--1952)". Université de Montréal. Archived from the original on 3 March 2016.
  11. ^ "Total Solar Eclipse of 1952 Feb 25". EclipseWise.com. Retrieved 5 August 2024.
  12. ^ 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.
  13. ^ Ten Millennium Catalog of Long Solar Eclipses, −3999 to 6000 (4000 BCE to 6000 CE) Fred Espenak.
  14. ^ "NASA - Catalog of Solar Eclipses of Saros 139". eclipse.gsfc.nasa.gov.

References

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