Solar eclipse of March 17, 1923

Last updated
Solar eclipse of March 17, 1923
SE1923Mar17A.png
Map
Type of eclipse
NatureAnnular
Gamma −0.5438
Magnitude 0.931
Maximum eclipse
Duration471 s (7 min 51 s)
Coordinates 33°00′S2°24′E / 33°S 2.4°E / -33; 2.4
Max. width of band305 km (190 mi)
Times (UTC)
Greatest eclipse12:44:58
References
Saros 138 (26 of 70)
Catalog # (SE5000) 9334

An annular solar eclipse occurred at the Moon's descending node of orbit on Saturday, March 17, 1923, [1] with a magnitude of 0.931. 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 1.7 days before apogee (on March 19, 1923, at 20:30 UTC), the Moon's apparent diameter was smaller. [2]

Contents

Annularity was visible from Chile, Argentina, Falkland Islands including capital Stanley, Gough Island in Tristan da Cunha, South West Africa (today's Namibia), Bechuanaland Protectorate (today's Botswana, Southern Rhodesia (today's Zimbabwe) including capital Salisbury, Portuguese Mozambique (today's Mozambique), Nyasaland (today's Malawi), French Madagascar (the part now belonging to Madagascar, and the Islands of Juan de Nova and Tromelin). A partial eclipse was visible for parts of southern South America, Southern Africa, Central Africa, and Antarctica.

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 17, 1923 Solar Eclipse Times
EventTime (UTC)
First Penumbral External Contact1923 March 17 at 09:50:46.8 UTC
First Umbral External Contact1923 March 17 at 11:02:32.4 UTC
First Central Line1923 March 17 at 11:05:55.6 UTC
First Umbral Internal Contact1923 March 17 at 11:09:20.9 UTC
Equatorial Conjunction1923 March 17 at 12:24:30.3 UTC
Greatest Duration1923 March 17 at 12:44:57.5 UTC
Greatest Eclipse1923 March 17 at 12:44:57.7 UTC
Ecliptic Conjunction1923 March 17 at 12:51:27.3 UTC
Last Umbral Internal Contact1923 March 17 at 14:20:49.0 UTC
Last Central Line1923 March 17 at 14:24:15.1 UTC
Last Umbral External Contact1923 March 17 at 14:27:39.2 UTC
Last Penumbral External Contact1923 March 17 at 15:39:20.9 UTC
March 17, 1923 Solar Eclipse Parameters
ParameterValue
Eclipse Magnitude0.93100
Eclipse Obscuration0.86676
Gamma−0.54381
Sun Right Ascension23h44m59.2s
Sun Declination-01°37'34.5"
Sun Semi-Diameter16'04.2"
Sun Equatorial Horizontal Parallax08.8"
Moon Right Ascension23h45m34.9s
Moon Declination-02°05'35.9"
Moon Semi-Diameter14'46.5"
Moon Equatorial Horizontal Parallax0°54'13.4"
ΔT23.1 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 March 1923
March 3
Ascending node (full moon)
March 17
Descending node (new moon)
Lunar eclipse chart close-1923Mar03.png SE1923Mar17A.png
Partial lunar eclipse
Lunar Saros 112
Annular solar eclipse
Solar Saros 138

Eclipses in 1923

Metonic

Tzolkinex

Half-Saros

Tritos

Solar Saros 138

Inex

Triad

Solar eclipses of 1921–1924

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 31, 1924 occurs in the next lunar year eclipse set.

Solar eclipse series sets from 1921 to 1924
Descending node Ascending node
SarosMapGammaSarosMapGamma
118 April 8, 1921
SE1921Apr08A.png
Annular
0.8869123 October 1, 1921
SE1921Oct01T.png
Total
−0.9383
128 March 28, 1922
SE1922Mar28A.png
Annular
0.1711133 September 21, 1922
SE1922Sep21T.png
Total
−0.213
138 March 17, 1923
SE1923Mar17A.png
Annular
−0.5438143 September 10, 1923
SE1923Sep10T.png
Total
0.5149
148 March 5, 1924
SE1924Mar05P.png
Partial
−1.2232153 August 30, 1924
SE1924Aug30P.png
Partial
1.3123

Saros 138

This eclipse is a part of Saros series 138, repeating every 18 years, 11 days, and containing 70 events. The series started with a partial solar eclipse on June 6, 1472. It contains annular eclipses from August 31, 1598 through February 18, 2482; a hybrid eclipse on March 1, 2500; and total eclipses from March 12, 2518 through April 3, 2554. The series ends at member 70 as a partial eclipse on July 11, 2716. 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 annularity was produced by member 23 at 8 minutes, 2 seconds on February 11, 1869, and the longest duration of totality will be produced by member 61 at 56 seconds on April 3, 2554. All eclipses in this series occur at the Moon’s descending node of orbit. [5]

Series members 20–41 occur between 1801 and 2200:
202122
SE1815Jan10A.png
January 10, 1815
SE1833Jan20A.png
January 20, 1833
SE1851Feb01A.png
February 1, 1851
232425
SE1869Feb11A.png
February 11, 1869
SE1887Feb22A.png
February 22, 1887
SE1905Mar06A.png
March 6, 1905
262728
SE1923Mar17A.png
March 17, 1923
SE1941Mar27A.png
March 27, 1941
SE1959Apr08A.png
April 8, 1959
293031
SE1977Apr18A.png
April 18, 1977
SE1995Apr29A.png
April 29, 1995
SE2013May10A.png
May 10, 2013
323334
SE2031May21A.png
May 21, 2031
SE2049May31A.png
May 31, 2049
SE2067Jun11A.png
June 11, 2067
353637
SE2085Jun22A.png
June 22, 2085
SE2103Jul04A.png
July 4, 2103
SE2121Jul14A.png
July 14, 2121
383940
SE2139Jul25A.png
July 25, 2139
SE2157Aug05A.png
August 5, 2157
SE2175Aug16A.png
August 16, 2175
41
SE2193Aug26A.png
August 26, 2193

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 March 16, 1866 and August 9, 1953
March 16–17January 1–3October 20–22August 9–10May 27–29
108110112114116
SE1866Mar16P.gif
March 16, 1866
SE1877Aug09P.gif
August 9, 1877
SE1881May27P.gif
May 27, 1881
118120122124126
SE1885Mar16A.gif
March 16, 1885
SE1889Jan01T.png
January 1, 1889
SE1892Oct20P.gif
October 20, 1892
SE1896Aug09T.png
August 9, 1896
SE1900May28T.png
May 28, 1900
128130132134136
SE1904Mar17A.png
March 17, 1904
SE1908Jan03T.png
January 3, 1908
SE1911Oct22A.png
October 22, 1911
SE1915Aug10A.png
August 10, 1915
SE1919May29T.png
May 29, 1919
138140142144146
SE1923Mar17A.png
March 17, 1923
SE1927Jan03A.png
January 3, 1927
SE1930Oct21T.png
October 21, 1930
SE1934Aug10A.png
August 10, 1934
SE1938May29T.png
May 29, 1938
148150152154
SE1942Mar16P.png
March 16, 1942
SE1946Jan03P.png
January 3, 1946
SE1949Oct21P.png
October 21, 1949
SE1953Aug09P.png
August 9, 1953

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
SE1803Feb21T.png
February 21, 1803
(Saros 127)
SE1814Jan21A.gif
January 21, 1814
(Saros 128)
SE1824Dec20Am.gif
December 20, 1824
(Saros 129)
SE1835Nov20T.png
November 20, 1835
(Saros 130)
SE1846Oct20A.png
October 20, 1846
(Saros 131)
SE1857Sep18A.png
September 18, 1857
(Saros 132)
SE1868Aug18T.png
August 18, 1868
(Saros 133)
SE1879Jul19A.png
July 19, 1879
(Saros 134)
SE1890Jun17A.png
June 17, 1890
(Saros 135)
SE1901May18T.png
May 18, 1901
(Saros 136)
SE1912Apr17H.png
April 17, 1912
(Saros 137)
SE1923Mar17A.png
March 17, 1923
(Saros 138)
SE1934Feb14T.png
February 14, 1934
(Saros 139)
SE1945Jan14A.png
January 14, 1945
(Saros 140)
SE1955Dec14A.png
December 14, 1955
(Saros 141)
SE1966Nov12T.png
November 12, 1966
(Saros 142)
SE1977Oct12T.png
October 12, 1977
(Saros 143)
SE1988Sep11A.png
September 11, 1988
(Saros 144)
SE1999Aug11T.png
August 11, 1999
(Saros 145)
SE2010Jul11T.png
July 11, 2010
(Saros 146)
SE2021Jun10A.png
June 10, 2021
(Saros 147)
SE2032May09A.png
May 9, 2032
(Saros 148)
SE2043Apr09T.png
April 9, 2043
(Saros 149)
SE2054Mar09P.png
March 9, 2054
(Saros 150)
SE2065Feb05P.png
February 5, 2065
(Saros 151)
SE2076Jan06T.png
January 6, 2076
(Saros 152)
SE2086Dec06P.png
December 6, 2086
(Saros 153)
SE2097Nov04A.png
November 4, 2097
(Saros 154)
Saros155 11van71 SE2108Oct05T.jpg
October 5, 2108
(Saros 155)
Saros156 07van69 SE2119Sep05P.jpg
September 5, 2119
(Saros 156)
Saros157 05van70 SE2130Aug04P.jpg
August 4, 2130
(Saros 157)
Saros158 05van70 SE2141Jul03P.jpg
July 3, 2141
(Saros 158)
Saros159 02van70 SE2152Jun03P.jpg
June 3, 2152
(Saros 159)
Saros161 01van72 SE2174Apr01P.jpg
April 1, 2174
(Saros 161)

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
SE1807Jun06H.gif
June 6, 1807
(Saros 134)
SE1836May15A.gif
May 15, 1836
(Saros 135)
SE1865Apr25T.png
April 25, 1865
(Saros 136)
SE1894Apr06H.gif
April 6, 1894
(Saros 137)
SE1923Mar17A.png
March 17, 1923
(Saros 138)
SE1952Feb25T.png
February 25, 1952
(Saros 139)
SE1981Feb04A.png
February 4, 1981
(Saros 140)
SE2010Jan15A.png
January 15, 2010
(Saros 141)
SE2038Dec26T.png
December 26, 2038
(Saros 142)
SE2067Dec06H.png
December 6, 2067
(Saros 143)
SE2096Nov15A.png
November 15, 2096
(Saros 144)
SE2125Oct26T.png
October 26, 2125
(Saros 145)
SE2154Oct07T.png
October 7, 2154
(Saros 146)
Saros147 32van80 SE2183Sep16A.jpg
September 16, 2183
(Saros 147)

Notes

  1. "March 17, 1923 Annular Solar Eclipse". timeanddate. Retrieved 2 August 2024.
  2. "Moon Distances for London, United Kingdom, England". timeanddate. Retrieved 2 August 2024.
  3. "Annular Solar Eclipse of 1923 Mar 17". EclipseWise.com. Retrieved 2 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 138". eclipse.gsfc.nasa.gov.

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References