Solar eclipse of October 1, 1921

Last updated
Solar eclipse of October 1, 1921
SE1921Oct01T.png
Map
Type of eclipse
NatureTotal
Gamma −0.9383
Magnitude 1.0293
Maximum eclipse
Duration112 s (1 min 52 s)
Coordinates 66°06′S56°06′W / 66.1°S 56.1°W / -66.1; -56.1
Max. width of band291 km (181 mi)
Times (UTC)
Greatest eclipse12:35:58
References
Saros 123 (48 of 70)
Catalog # (SE5000) 9331

A total solar eclipse occurred at the Moon's ascending node of orbit on Saturday, October 1, 1921, [1] with a magnitude of 1.0293. 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 1.9 days after perigee (on September 29, 1921, at 14:50 UTC), the Moon's apparent diameter was larger. [2]

Contents

Totality was visible from parts of Antarctica. A partial eclipse was visible for parts of South America 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]

October 1, 1921 Solar Eclipse Times
EventTime (UTC)
First Penumbral External Contact1921 October 01 at 10:27:26.7 UTC
First Umbral External Contact1921 October 01 at 11:58:17.2 UTC
First Central Line1921 October 01 at 12:00:11.9 UTC
First Umbral Internal Contact1921 October 01 at 12:02:12.3 UTC
Ecliptic Conjunction1921 October 01 at 12:26:22.9 UTC
Greatest Duration1921 October 01 at 12:35:07.2 UTC
Greatest Eclipse1921 October 01 at 12:35:58.1 UTC
Equatorial Conjunction1921 October 01 at 13:07:31.9 UTC
Last Umbral Internal Contact1921 October 01 at 13:09:22.8 UTC
Last Central Line1921 October 01 at 13:11:21.2 UTC
Last Umbral External Contact1921 October 01 at 13:13:14.0 UTC
Last Penumbral External Contact1921 October 01 at 14:44:18.5 UTC
October 1, 1921 Solar Eclipse Parameters
ParameterValue
Eclipse Magnitude1.02931
Eclipse Obscuration1.05948
Gamma−0.93833
Sun Right Ascension12h28m35.7s
Sun Declination-03°05'21.9"
Sun Semi-Diameter15'58.8"
Sun Equatorial Horizontal Parallax08.8"
Moon Right Ascension12h27m27.1s
Moon Declination-03°58'54.5"
Moon Semi-Diameter16'21.8"
Moon Equatorial Horizontal Parallax1°00'03.1"
ΔT22.4 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 October 1921
October 1
Ascending node (new moon)
October 16
Descending node (full moon)
SE1921Oct01T.png Lunar eclipse chart close-1921Oct16.png
Total solar eclipse
Solar Saros 123
Partial lunar eclipse
Lunar Saros 135

Eclipses in 1921

Metonic

Tzolkinex

Half-Saros

Tritos

Solar Saros 123

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 123

This eclipse is a part of Saros series 123, repeating every 18 years, 11 days, and containing 70 events. The series started with a partial solar eclipse on April 29, 1074. It contains annular eclipses from July 2, 1182 through April 19, 1651; hybrid eclipses from April 30, 1669 through May 22, 1705; and total eclipses from June 3, 1723 through October 23, 1957. The series ends at member 70 as a partial eclipse on May 31, 2318. 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 19 at 8 minutes, 7 seconds on November 9, 1398, and the longest duration of totality was produced by member 42 at 3 minutes, 27 seconds on July 27, 1813. All eclipses in this series occur at the Moon’s ascending node of orbit. [5]

Series members 42–63 occur between 1801 and 2200:
424344
SE1813Jul27T.gif
July 27, 1813
SE1831Aug07T.gif
August 7, 1831
SE1849Aug18T.gif
August 18, 1849
454647
SE1867Aug29T.png
August 29, 1867
SE1885Sep08T.png
September 8, 1885
SE1903Sep21T.png
September 21, 1903
484950
SE1921Oct01T.png
October 1, 1921
SE1939Oct12T.png
October 12, 1939
SE1957Oct23T.png
October 23, 1957
515253
SE1975Nov03P.png
November 3, 1975
SE1993Nov13P.png
November 13, 1993
SE2011Nov25P.png
November 25, 2011
545556
SE2029Dec05P.png
December 5, 2029
SE2047Dec16P.png
December 16, 2047
SE2065Dec27P.png
December 27, 2065
575859
SE2084Jan07P.png
January 7, 2084
Saros123 58van70 SE2102Jan19P.jpg
January 19, 2102
Saros123 59van70 SE2120Jan30P.jpg
January 30, 2120
606162
Saros123 60van70 SE2138Feb09P.jpg
February 9, 2138
Saros123 61van70 SE2156Feb21P.jpg
February 21, 2156
Saros123 62van70 SE2174Mar03P.jpg
March 3, 2174
63
Saros123 63van70 SE2192Mar13P.jpg
March 13, 2192

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 13, 1898 and July 20, 1982
December 13–14October 1–2July 20–21May 9February 24–25
111113115117119
SE1898Dec13P.gif
December 13, 1898
SE1906Jul21P.png
July 21, 1906
SE1910May09T.png
May 9, 1910
SE1914Feb25A.png
February 25, 1914
121123125127129
SE1917Dec14A.png
December 14, 1917
SE1921Oct01T.png
October 1, 1921
SE1925Jul20A.png
July 20, 1925
SE1929May09T.png
May 9, 1929
SE1933Feb24A.png
February 24, 1933
131133135137139
SE1936Dec13A.png
December 13, 1936
SE1940Oct01T.png
October 1, 1940
SE1944Jul20A.png
July 20, 1944
SE1948May09A.png
May 9, 1948
SE1952Feb25T.png
February 25, 1952
141143145147149
SE1955Dec14A.png
December 14, 1955
SE1959Oct02T.png
October 2, 1959
SE1963Jul20T.png
July 20, 1963
SE1967May09P.png
May 9, 1967
SE1971Feb25P.png
February 25, 1971
151153155
SE1974Dec13P.png
December 13, 1974
SE1978Oct02P.png
October 2, 1978
SE1982Jul20P.png
July 20, 1982

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
SE1801Sep08P.png
September 8, 1801
(Saros 112)
SE1812Aug07P.gif
August 7, 1812
(Saros 113)
SE1823Jul08P.gif
July 8, 1823
(Saros 114)
SE1834Jun07P.gif
June 7, 1834
(Saros 115)
SE1845May06An.gif
May 6, 1845
(Saros 116)
SE1856Apr05T.gif
April 5, 1856
(Saros 117)
SE1867Mar06A.gif
March 6, 1867
(Saros 118)
SE1878Feb02A.gif
February 2, 1878
(Saros 119)
SE1889Jan01T.png
January 1, 1889
(Saros 120)
SE1899Dec03A.png
December 3, 1899
(Saros 121)
SE1910Nov02P.png
November 2, 1910
(Saros 122)
SE1921Oct01T.png
October 1, 1921
(Saros 123)
SE1932Aug31T.png
August 31, 1932
(Saros 124)
SE1943Aug01A.png
August 1, 1943
(Saros 125)
SE1954Jun30T.png
June 30, 1954
(Saros 126)
SE1965May30T.png
May 30, 1965
(Saros 127)
SE1976Apr29A.png
April 29, 1976
(Saros 128)
SE1987Mar29H.png
March 29, 1987
(Saros 129)
SE1998Feb26T.png
February 26, 1998
(Saros 130)
SE2009Jan26A.png
January 26, 2009
(Saros 131)
SE2019Dec26A.png
December 26, 2019
(Saros 132)
SE2030Nov25T.png
November 25, 2030
(Saros 133)
SE2041Oct25A.png
October 25, 2041
(Saros 134)
SE2052Sep22A.png
September 22, 2052
(Saros 135)
SE2063Aug24T.png
August 24, 2063
(Saros 136)
SE2074Jul24A.png
July 24, 2074
(Saros 137)
SE2085Jun22A.png
June 22, 2085
(Saros 138)
SE2096May22T.png
May 22, 2096
(Saros 139)
SE2107Apr23A.png
April 23, 2107
(Saros 140)
SE2118Mar22A.png
March 22, 2118
(Saros 141)
SE2129Feb18T.png
February 18, 2129
(Saros 142)
SE2140Jan20A.png
January 20, 2140
(Saros 143)
SE2150Dec19A.png
December 19, 2150
(Saros 144)
SE2161Nov17T.png
November 17, 2161
(Saros 145)
SE2172Oct17H.png
October 17, 2172
(Saros 146)
Saros147 32van80 SE2183Sep16A.jpg
September 16, 2183
(Saros 147)
Saros148 31van75 SE2194Aug16T.jpg
August 16, 2194
(Saros 148)

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
SE1805Dec21A.gif
December 21, 1805
(Saros 119)
SE1834Nov30T.gif
November 30, 1834
(Saros 120)
SE1863Nov11A.png
November 11, 1863
(Saros 121)
SE1892Oct20P.gif
October 20, 1892
(Saros 122)
SE1921Oct01T.png
October 1, 1921
(Saros 123)
SE1950Sep12T.png
September 12, 1950
(Saros 124)
SE1979Aug22A.png
August 22, 1979
(Saros 125)
SE2008Aug01T.png
August 1, 2008
(Saros 126)
SE2037Jul13T.png
July 13, 2037
(Saros 127)
SE2066Jun22A.png
June 22, 2066
(Saros 128)
SE2095Jun02T.png
June 2, 2095
(Saros 129)
SE2124May14T.png
May 14, 2124
(Saros 130)
SE2153Apr23A.png
April 23, 2153
(Saros 131)
SE2182Apr03H.png
April 3, 2182
(Saros 132)

Notes

  1. "October 1, 1921 Total Solar Eclipse". timeanddate. Retrieved 2 August 2024.
  2. "Moon Distances for London, United Kingdom, England". timeanddate. Retrieved 2 August 2024.
  3. "Total Solar Eclipse of 1921 Oct 01". 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 123". eclipse.gsfc.nasa.gov.

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References