Solar eclipse of May 20, 1947

Last updated
Solar eclipse of May 20, 1947
SE1947May20T.png
Map
Type of eclipse
NatureTotal
Gamma −0.3528
Magnitude 1.0557
Maximum eclipse
Duration313 s (5 min 13 s)
Coordinates 0°12′N21°24′W / 0.2°N 21.4°W / 0.2; -21.4
Max. width of band196 km (122 mi)
Times (UTC)
Greatest eclipse13:47:47
References
Saros 127 (54 of 82)
Catalog # (SE5000) 9392

A total solar eclipse occurred at the Moon's ascending node of orbit on Tuesday, May 20, 1947, [1] with a magnitude of 1.0557. 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 before perigee (on May 22, 1947, at 9:10 UTC), the Moon's apparent diameter was larger. [2]

Contents

Totality was visible from Chile including the capital city Santiago, Argentina, Paraguay, Brazil, Liberia, French West Africa (the parts now belonging to Ivory Coast and Benin), British Gold Coast (today's Ghana) including capital Accra, French Togoland (today's Togo) including capital Lomé, British Nigeria (today's Nigeria) including capital Lagos, French Cameroons (now belonging to Cameroon), French Equatorial Africa (the parts now belonging to Central African Republic and R. Congo), Belgian Congo (today's DR Congo), British Uganda (today's Uganda), British Tanganyika (now belonging to Tanzania), and British Kenya (today's Kenya). The southern part of Aconcagua, the highest mountain outside Asia, and Iguazu Falls, one of the largest waterfalls systems in the world, lay in the path of totality. A partial eclipse was visible for most of South America and Africa.

Observations

The Royal Astronomical Society of Canada sent a team to Araxa, Brazil. On the morning of the eclipse day, the sky was covered with clouds. Although a slight part of sunlight was seen through the gaps in the clouds around the first contact (the beginning of the partial phase), the weather did not improve after that. The eclipse ended at noon, and the sky began to clear up in the afternoon. The team documented changes in winds and luminance of the sky. [3] Australian radio astronomers originally planned to go to Brazil to make radio observations to promote the development of radio astronomy in Australia. However, the shipping of the equipments could only be made via London at that time, and it was not made before the eclipse in the end, so the plan was not successful. Another team from the Soviet Union successfully made radio observations in Brazil. [4]

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. [5]

May 20, 1947 Solar Eclipse Times
EventTime (UTC)
First Penumbral External Contact1947 May 20 at 11:11:14.5 UTC
First Umbral External Contact1947 May 20 at 12:08:46.7 UTC
First Central Line1947 May 20 at 12:09:53.9 UTC
First Umbral Internal Contact1947 May 20 at 12:11:01.1 UTC
First Penumbral Internal Contact1947 May 20 at 13:16:38.2 UTC
Equatorial Conjunction1947 May 20 at 13:35:31.5 UTC
Ecliptic Conjunction1947 May 20 at 13:44:07.5 UTC
Greatest Eclipse1947 May 20 at 13:47:47.0 UTC
Greatest Duration1947 May 20 at 13:54:23.9 UTC
Last Penumbral Internal Contact1947 May 20 at 14:19:13.8 UTC
Last Umbral Internal Contact1947 May 20 at 15:24:38.7 UTC
Last Central Line1947 May 20 at 15:25:47.7 UTC
Last Umbral External Contact1947 May 20 at 15:26:56.7 UTC
Last Penumbral External Contact1947 May 20 at 16:24:20.8 UTC
May 20, 1947 Solar Eclipse Parameters
ParameterValue
Eclipse Magnitude1.05567
Eclipse Obscuration1.11445
Gamma−0.35279
Sun Right Ascension03h45m52.5s
Sun Declination+19°52'36.9"
Sun Semi-Diameter15'48.2"
Sun Equatorial Horizontal Parallax08.7"
Moon Right Ascension03h46m20.8s
Moon Declination+19°32'28.8"
Moon Semi-Diameter16'25.3"
Moon Equatorial Horizontal Parallax1°00'16.3"
ΔT28.0 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.

Eclipse season of May–June 1947
May 20
Ascending node (new moon)		 June 3
Descending node (full moon)
SE1947May20T.png Lunar eclipse chart close-1947Jun03.png
Total solar eclipse
Solar Saros 127		 Partial lunar eclipse
Lunar Saros 139

Eclipses in 1947

Metonic

Tzolkinex

Half-Saros

Tritos

Solar Saros 127

Inex

Triad

Solar eclipses of 1946–1949

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. [6]

The partial solar eclipses on January 3, 1946 and June 29, 1946 occur in the previous lunar year eclipse set.

Solar eclipse series sets from 1946 to 1949
Ascending node Descending node
SarosMapGammaSarosMapGamma
117 May 30, 1946
SE1946May30P.png
Partial		−1.0711122 November 23, 1946
SE1946Nov23P.png
Partial		1.105
127 May 20, 1947
SE1947May20T.png
Total		−0.3528132 November 12, 1947
SE1947Nov12A.png
Annular		0.3743
137 May 9, 1948
SE1948May09A.png
Annular		0.4133142 November 1, 1948
SE1948Nov01T.png
Total		−0.3517
147 April 28, 1949
SE1949Apr28P.png
Partial		1.2068152 October 21, 1949
SE1949Oct21P.png
Partial		−1.027

Saros 127

This eclipse is a part of Saros series 127, repeating every 18 years, 11 days, and containing 82 events. The series started with a partial solar eclipse on October 10, 991 AD. It contains total eclipses from May 14, 1352 through August 15, 2091. There are no annular or hybrid eclipses in this set. The series ends at member 82 as a partial eclipse on March 21, 2452. 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 31 at 5 minutes, 40 seconds on August 30, 1532. All eclipses in this series occur at the Moon’s ascending node of orbit. [7]

Series members 46–68 occur between 1801 and 2200:
464748
SE1803Feb21T.png
February 21, 1803		 SE1821Mar04T.gif
March 4, 1821		 SE1839Mar15T.gif
March 15, 1839
495051
SE1857Mar25T.gif
March 25, 1857 		SE1875Apr06T.png
April 6, 1875 		SE1893Apr16T.png
April 16, 1893
525354
SE1911Apr28T.png
April 28, 1911 		SE1929May09T.png
May 9, 1929 		SE1947May20T.png
May 20, 1947
555657
SE1965May30T.png
May 30, 1965 		SE1983Jun11T.png
June 11, 1983 		SE2001Jun21T.png
June 21, 2001
585960
SE2019Jul02T.png
July 2, 2019 		SE2037Jul13T.png
July 13, 2037 		SE2055Jul24T.png
July 24, 2055
616263
SE2073Aug03T.png
August 3, 2073 		SE2091Aug15T.png
August 15, 2091 		Saros127 63van82 SE2109Aug26P.jpg
August 26, 2109
646566
Saros127 64van82 SE2127Sep06P.jpg
September 6, 2127		 Saros127 65van82 SE2145Sep16P.jpg
September 16, 2145		 Saros127 66van82 SE2163Sep28P.jpg
September 28, 2163
6768
Saros127 67van82 SE2181Oct08P.jpg
October 8, 2181		 Saros127 68van82 SE2199Oct19P.jpg
October 19, 2199

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 December 24, 1916 and July 31, 2000
December 24–25October 12July 31–August 1May 19–20March 7
111113115117119
SE1916Dec24P.png
December 24, 1916 		SE1924Jul31P.png
July 31, 1924 		SE1928May19T.png
May 19, 1928 		SE1932Mar07A.png
March 7, 1932
121123125127129
SE1935Dec25A.png
December 25, 1935 		SE1939Oct12T.png
October 12, 1939 		SE1943Aug01A.png
August 1, 1943 		SE1947May20T.png
May 20, 1947 		SE1951Mar07A.png
March 7, 1951
131133135137139
SE1954Dec25A.png
December 25, 1954 		SE1958Oct12T.png
October 12, 1958 		SE1962Jul31A.png
July 31, 1962 		SE1966May20A.png
May 20, 1966 		SE1970Mar07T.png
March 7, 1970
141143145147149
SE1973Dec24A.png
December 24, 1973 		SE1977Oct12T.png
October 12, 1977 		SE1981Jul31T.png
July 31, 1981 		SE1985May19P.png
May 19, 1985 		SE1989Mar07P.png
March 7, 1989
151153155
SE1992Dec24P.png
December 24, 1992 		SE1996Oct12P.png
October 12, 1996 		SE2000Jul31P.png
July 31, 2000

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
SE1805Jun26P.gif
June 26, 1805
(Saros 114)		 SE1816May27A.gif
May 27, 1816
(Saros 115)		 SE1827Apr26A.gif
April 26, 1827
(Saros 116)		 SE1838Mar25T.gif
March 25, 1838
(Saros 117)		 SE1849Feb23A.gif
February 23, 1849
(Saros 118)
SE1860Jan23A.png
January 23, 1860
(Saros 119)		 SE1870Dec22T.png
December 22, 1870
(Saros 120)		 SE1881Nov21A.gif
November 21, 1881
(Saros 121)		 SE1892Oct20P.gif
October 20, 1892
(Saros 122)		 SE1903Sep21T.png
September 21, 1903
(Saros 123)
SE1914Aug21T.png
August 21, 1914
(Saros 124)		 SE1925Jul20A.png
July 20, 1925
(Saros 125)		 SE1936Jun19T.png
June 19, 1936
(Saros 126)		 SE1947May20T.png
May 20, 1947
(Saros 127)		 SE1958Apr19A.png
April 19, 1958
(Saros 128)
SE1969Mar18A.png
March 18, 1969
(Saros 129)		 SE1980Feb16T.png
February 16, 1980
(Saros 130)		 SE1991Jan15A.png
January 15, 1991
(Saros 131)		 SE2001Dec14A.png
December 14, 2001
(Saros 132)		 SE2012Nov13T.png
November 13, 2012
(Saros 133)
SE2023Oct14A.png
October 14, 2023
(Saros 134)		 SE2034Sep12A.png
September 12, 2034
(Saros 135)		 SE2045Aug12T.png
August 12, 2045
(Saros 136)		 SE2056Jul12A.png
July 12, 2056
(Saros 137)		 SE2067Jun11A.png
June 11, 2067
(Saros 138)
SE2078May11T.png
May 11, 2078
(Saros 139)		 SE2089Apr10A.png
April 10, 2089
(Saros 140)		 SE2100Mar10A.png
March 10, 2100
(Saros 141)		 SE2111Feb08T.png
February 8, 2111
(Saros 142)		 SE2122Jan08A.png
January 8, 2122
(Saros 143)
SE2132Dec07A.png
December 7, 2132
(Saros 144)		 SE2143Nov07T.png
November 7, 2143
(Saros 145)		 SE2154Oct07T.png
October 7, 2154
(Saros 146)		 Saros147 31van80 SE2165Sep05A.jpg
September 5, 2165
(Saros 147)		 Saros148 30van75 SE2176Aug04T.jpg
August 4, 2176
(Saros 148)
Saros149 30van71 SE2187Jul06T.jpg
July 6, 2187
(Saros 149)		 Saros150 27van71 SE2198Jun04A.jpg
June 4, 2198
(Saros 150)

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
SE1802Aug28A.png
August 28, 1802
(Saros 122)		 SE1831Aug07T.gif
August 7, 1831
(Saros 123)		 SE1860Jul18T.png
July 18, 1860
(Saros 124)
SE1889Jun28A.png
June 28, 1889
(Saros 125)		 SE1918Jun08T.png
June 8, 1918
(Saros 126)		 SE1947May20T.png
May 20, 1947
(Saros 127)
SE1976Apr29A.png
April 29, 1976
(Saros 128)		 SE2005Apr08H.png
April 8, 2005
(Saros 129)		 SE2034Mar20T.png
March 20, 2034
(Saros 130)
SE2063Feb28A.png
February 28, 2063
(Saros 131)		 SE2092Feb07A.png
February 7, 2092
(Saros 132)		 SE2121Jan19T.png
January 19, 2121
(Saros 133)
SE2149Dec30A.png
December 30, 2149
(Saros 134)		 SE2178Dec09A.png
December 9, 2178
(Saros 135)

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References

  1. ↑ "May 20, 1947 Total Solar Eclipse". timeanddate. Retrieved 4 August 2024.
  2. ↑ "Moon Distances for London, United Kingdom, England". timeanddate. Retrieved 4 August 2024.
  3. ↑ James Hargreaves. "Observations of the Total Solar Eclipse at Araxa, Brazil, 1947, May 20". Journal of the Royal Astronomical Society of Canada. 43: 229–236. Archived from the original on 5 June 2019.
  4. ↑ Harry Wendt, Wayne Orchiston, Bruce Slee (2008). "The Australian solar eclipse expeditions of 1947 and 1949" (PDF). Journal of Astronomical History and Heritage. 11 (1): 71–78. ISSN   1440-2807. Archived from the original (PDF) on 24 June 2019.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  5. ↑ "Total Solar Eclipse of 1947 May 20". EclipseWise.com. Retrieved 4 August 2024.
  6. ↑ 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.
  7. ↑ "NASA - Catalog of Solar Eclipses of Saros 127". eclipse.gsfc.nasa.gov.
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