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Solar eclipse of October 21, 1949

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Solar eclipse of October 21, 1949
Map
Type of eclipse
NaturePartial
Gamma−1.027
Magnitude0.9638
Maximum eclipse
Coordinates61°30′S 107°30′E / 61.5°S 107.5°E / -61.5; 107.5
Times (UTC)
Greatest eclipse21:13:01
References
Saros152 (9 of 70)
Catalog # (SE5000)9397

A partial solar eclipse occurred at the Moon's descending node of orbit on Friday, October 21, 1949,[1] with a magnitude of 0.9638. 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 partial solar eclipse occurs in the polar regions of the Earth when the center of the Moon's shadow misses the Earth.

A partial eclipse was visible for parts of Australia, Oceania, and Antarctica.

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.[2]

October 21, 1949 Solar Eclipse Times
Event Time (UTC)
First Penumbral External Contact 1949 October 21 at 19:15:33.6 UTC
Greatest Eclipse 1949 October 21 at 21:13:00.6 UTC
Ecliptic Conjunction 1949 October 21 at 21:23:16.5 UTC
Equatorial Conjunction 1949 October 21 at 22:05:37.5 UTC
Last Penumbral External Contact 1949 October 21 at 23:10:06.9 UTC
October 21, 1949 Solar Eclipse Parameters
Parameter Value
Eclipse Magnitude 0.96380
Eclipse Obscuration 0.96320
Gamma −1.02696
Sun Right Ascension 13h44m32.4s
Sun Declination -10°48'59.9"
Sun Semi-Diameter 16'04.3"
Sun Equatorial Horizontal Parallax 08.8"
Moon Right Ascension 13h42m37.9s
Moon Declination -11°45'16.5"
Moon Semi-Diameter 16'43.7"
Moon Equatorial Horizontal Parallax 1°01'23.6"
ΔT 29.1 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 October 1949
October 7
Ascending node (full moon)
October 21
Descending node (new moon)
Total lunar eclipse
Lunar Saros 126
Partial solar eclipse
Solar Saros 152
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Eclipses in 1949

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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 152

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Inex

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Triad

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Solar eclipses of 1946–1949

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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.[3]

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
Saros Map Gamma Saros Map Gamma
117 May 30, 1946

Partial
−1.0711 122 November 23, 1946

Partial
1.105
127 May 20, 1947

Total
−0.3528 132 November 12, 1947

Annular
0.3743
137 May 9, 1948

Annular
0.4133 142 November 1, 1948

Total
−0.3517
147 April 28, 1949

Partial
1.2068 152 October 21, 1949

Partial
−1.027

Saros 152

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This eclipse is a part of Saros series 152, repeating every 18 years, 11 days, and containing 70 events. The series started with a partial solar eclipse on July 26, 1805. It contains total eclipses from November 2, 1967 through September 14, 2490; hybrid eclipses from September 26, 2508 through October 17, 2544; and annular eclipses from October 29, 2562 through June 16, 2941. The series ends at member 70 as a partial eclipse on August 20, 3049. 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 30 at 5 minutes, 16 seconds on June 9, 2328, and the longest duration of annularity will be produced by member 53 at 5 minutes, 20 seconds on February 16, 2743. All eclipses in this series occur at the Moon’s descending node of orbit.[4]

Series members 1–22 occur between 1805 and 2200:
1 2 3

July 26, 1805

August 6, 1823

August 16, 1841
4 5 6

August 28, 1859

September 7, 1877

September 18, 1895
7 8 9

September 30, 1913

October 11, 1931

October 21, 1949
10 11 12

November 2, 1967

November 12, 1985

November 23, 2003
13 14 15

December 4, 2021

December 15, 2039

December 26, 2057
16 17 18

January 6, 2076

January 16, 2094

January 29, 2112
19 20 21

February 8, 2130

February 19, 2148

March 2, 2166
22

March 12, 2184

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 descending node.

22 eclipse events between March 16, 1866 and August 9, 1953
March 16–17 January 1–3 October 20–22 August 9–10 May 27–29
108 110 112 114 116

March 16, 1866

August 9, 1877

May 27, 1881
118 120 122 124 126

March 16, 1885

January 1, 1889

October 20, 1892

August 9, 1896

May 28, 1900
128 130 132 134 136

March 17, 1904

January 3, 1908

October 22, 1911

August 10, 1915

May 29, 1919
138 140 142 144 146

March 17, 1923

January 3, 1927

October 21, 1930

August 10, 1934

May 29, 1938
148 150 152 154

March 16, 1942

January 3, 1946

October 21, 1949

August 9, 1953

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 1982

November 29, 1807
(Saros 139)

October 29, 1818
(Saros 140)

September 28, 1829
(Saros 141)

August 27, 1840
(Saros 142)

July 28, 1851
(Saros 143)

June 27, 1862
(Saros 144)

May 26, 1873
(Saros 145)

April 25, 1884
(Saros 146)

March 26, 1895
(Saros 147)

February 23, 1906
(Saros 148)

January 23, 1917
(Saros 149)

December 24, 1927
(Saros 150)

November 21, 1938
(Saros 151)

October 21, 1949
(Saros 152)

September 20, 1960
(Saros 153)

August 20, 1971
(Saros 154)

July 20, 1982
(Saros 155)

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

January 30, 1805
(Saros 147)

January 9, 1834
(Saros 148)

December 21, 1862
(Saros 149)

December 1, 1891
(Saros 150)

November 10, 1920
(Saros 151)

October 21, 1949
(Saros 152)

October 2, 1978
(Saros 153)

September 11, 2007
(Saros 154)

August 21, 2036
(Saros 155)

August 2, 2065
(Saros 156)

July 12, 2094
(Saros 157)

June 23, 2123
(Saros 158)

June 3, 2152
(Saros 159)

May 13, 2181
(Saros 160)

References

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  1. ^ "October 21, 1949 Partial Solar Eclipse". timeanddate. Retrieved 4 August 2024.
  2. ^ "Partial Solar Eclipse of 1949 Oct 21". EclipseWise.com. Retrieved 4 August 2024.
  3. ^ 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.
  4. ^ "NASA - Catalog of Solar Eclipses of Saros 152". eclipse.gsfc.nasa.gov.
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