Solar eclipse of January 23, 1917

Last updated
Solar eclipse of January 23, 1917
SE1917Jan23P.png
Map
Type of eclipse
NaturePartial
Gamma 1.1508
Magnitude 0.7254
Maximum eclipse
Coordinates 63°12′N25°36′E / 63.2°N 25.6°E / 63.2; 25.6
Times (UTC)
Greatest eclipse7:28:31
References
Saros 149 (15 of 71)
Catalog # (SE5000) 9319

A partial solar eclipse occurred at the Moon's ascending node of orbit on Tuesday, January 23, 1917, [1] with a magnitude of 0.7254. 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.

Contents

This was the first of four solar eclipses in 1917, with the others occurring on June 19, July 19, and December 14.

A partial eclipse was visible for parts of Northeast Africa, Europe, West Asia, and Central Asia.

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. [2]

January 23, 1917 Solar Eclipse Times
EventTime (UTC)
First Penumbral External Contact1917 January 23 at 05:43:32.4 UTC
Greatest Eclipse1917 January 23 at 07:28:31.3 UTC
Ecliptic Conjunction1917 January 23 at 07:39:57.6 UTC
Equatorial Conjunction1917 January 23 at 08:08:41.5 UTC
Last Penumbral External Contact1917 January 23 at 09:13:12.8 UTC
January 23, 1917 Solar Eclipse Parameters
ParameterValue
Eclipse Magnitude0.72542
Eclipse Obscuration0.66080
Gamma1.15085
Sun Right Ascension20h20m08.5s
Sun Declination-19°33'15.8"
Sun Semi-Diameter16'14.8"
Sun Equatorial Horizontal Parallax08.9"
Moon Right Ascension20h18m33.1s
Moon Declination-18°26'25.6"
Moon Semi-Diameter16'44.5"
Moon Equatorial Horizontal Parallax1°01'26.6"
ΔT19.1 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. The first and last eclipse in this sequence is separated by one synodic month.

Eclipse season of December 1916–January 1917
December 24
Ascending node (new moon)
January 8
Descending node (full moon)
January 23
Ascending node (new moon)
SE1916Dec24P.png Lunar eclipse chart close-1917Jan08.png SE1917Jan23P.png
Partial solar eclipse
Solar Saros 111
Total lunar eclipse
Lunar Saros 123
Partial solar eclipse
Solar Saros 149

Eclipses in 1917

Metonic

Tzolkinex

Half-Saros

Tritos

Solar Saros 149

Inex

Triad

Solar eclipses of 1913–1917

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 April 6, 1913 and September 30, 1913 occur in the previous lunar year eclipse set, and the solar eclipses on December 24, 1916 (partial), June 19, 1917 (partial), and December 14, 1917 (annular) occur in the next lunar year eclipse set.

Solar eclipse series sets from 1913 to 1917
Descending node Ascending node
SarosMapGammaSarosMapGamma
114 August 31, 1913
SE1913Aug31P.png
Partial
1.4512119 February 25, 1914
SE1914Feb25A.png
Annular
−0.9416
124 August 21, 1914
SE1914Aug21T.png
Total
0.7655129 February 14, 1915
SE1915Feb14A.png
Annular
−0.2024
134 August 10, 1915
SE1915Aug10A.png
Annular
0.0124139
Solar eclipse of February 3, 1916 (cropped).png
February 3, 1916
SE1916Feb03T.png
Total
0.4987
144 July 30, 1916
SE1916Jul30A.png
Annular
−0.7709149 January 23, 1917
SE1917Jan23P.png
Partial
1.1508
154 July 19, 1917
SE1917Jul19P.png
Partial
−1.5101

Saros 149

This eclipse is a part of Saros series 149, repeating every 18 years, 11 days, and containing 71 events. The series started with a partial solar eclipse on August 21, 1664. It contains total eclipses from April 9, 2043 through October 2, 2331; hybrid eclipses from October 13, 2349 through November 3, 2385; and annular eclipses from November 15, 2403 through July 13, 2800. The series ends at member 71 as a partial eclipse on September 28, 2926. 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 31 at 4 minutes, 10 seconds on July 17, 2205, and the longest duration of annularity will be produced by member 62 at 5 minutes, 6 seconds on June 21, 2764. All eclipses in this series occur at the Moon’s ascending node of orbit. [4]

Series members 9–30 occur between 1801 and 2200:
91011
SE1808Nov18P.gif
November 18, 1808
SE1826Nov29P.gif
November 29, 1826
SE1844Dec09P.gif
December 9, 1844
121314
SE1862Dec21P.gif
December 21, 1862
SE1880Dec31P.gif
December 31, 1880
SE1899Jan11P.gif
January 11, 1899
151617
SE1917Jan23P.png
January 23, 1917
SE1935Feb03P.png
February 3, 1935
SE1953Feb14P.png
February 14, 1953
181920
SE1971Feb25P.png
February 25, 1971
SE1989Mar07P.png
March 7, 1989
SE2007Mar19P.png
March 19, 2007
212223
SE2025Mar29P.png
March 29, 2025
SE2043Apr09T.png
April 9, 2043
SE2061Apr20T.png
April 20, 2061
242526
SE2079May01T.png
May 1, 2079
SE2097May11T.png
May 11, 2097
SE2115May24T.png
May 24, 2115
272829
SE2133Jun03T.png
June 3, 2133
Saros149 28van71 SE2151Jun14T.jpg
June 14, 2151
SE2169Jun25T.png
June 25, 2169
30
Saros149 30van71 SE2187Jul06T.jpg
July 6, 2187

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.

25 eclipse events between April 5, 1837 and June 17, 1928
April 5–6January 22–23November 10–11August 28–30June 17–18
107109111113115
SE1837Apr05P.png
April 5, 1837
SE1841Jan22P.gif
January 22, 1841
SE1844Nov10P.gif
November 10, 1844
SE1848Aug28P.gif
August 28, 1848
SE1852Jun17P.gif
June 17, 1852
117119121123125
SE1856Apr05T.gif
April 5, 1856
SE1860Jan23A.gif
January 23, 1860
SE1863Nov11A.gif
November 11, 1863
SE1867Aug29T.gif
August 29, 1867
SE1871Jun18A.gif
June 18, 1871
127129131133135
SE1875Apr06T.gif
April 6, 1875
SE1879Jan22A.gif
January 22, 1879
SE1882Nov10A.gif
November 10, 1882
SE1886Aug29T.png
August 29, 1886
SE1890Jun17A.gif
June 17, 1890
137139141143145
SE1894Apr06H.gif
April 6, 1894
SE1898Jan22T.png
January 22, 1898
SE1901Nov11A.png
November 11, 1901
SE1905Aug30T.png
August 30, 1905
SE1909Jun17H.png
June 17, 1909
147149151153155
SE1913Apr06P.png
April 6, 1913
SE1917Jan23P.png
January 23, 1917
SE1920Nov10P.png
November 10, 1920
SE1924Aug30P.png
August 30, 1924
SE1928Jun17P.png
June 17, 1928

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 1982
SE1807Nov29H.gif
November 29, 1807
(Saros 139)
SE1818Oct29T.gif
October 29, 1818
(Saros 140)
SE1829Sep28A.gif
September 28, 1829
(Saros 141)
SE1840Aug27T.gif
August 27, 1840
(Saros 142)
SE1851Jul28T.png
July 28, 1851
(Saros 143)
SE1862Jun27P.gif
June 27, 1862
(Saros 144)
SE1873May26P.gif
May 26, 1873
(Saros 145)
SE1884Apr25P.gif
April 25, 1884
(Saros 146)
SE1895Mar26P.gif
March 26, 1895
(Saros 147)
SE1906Feb23P.png
February 23, 1906
(Saros 148)
SE1917Jan23P.png
January 23, 1917
(Saros 149)
SE1927Dec24P.png
December 24, 1927
(Saros 150)
SE1938Nov21P.png
November 21, 1938
(Saros 151)
SE1949Oct21P.png
October 21, 1949
(Saros 152)
SE1960Sep20P.png
September 20, 1960
(Saros 153)
SE1971Aug20P.png
August 20, 1971
(Saros 154)
SE1982Jul20P.png
July 20, 1982
(Saros 155)

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
SE1801Apr13P.png
April 13, 1801
(Saros 145)
SE1830Mar24P.gif
March 24, 1830
(Saros 146)
SE1859Mar04P.gif
March 4, 1859
(Saros 147)
SE1888Feb11P.gif
February 11, 1888
(Saros 148)
SE1917Jan23P.png
January 23, 1917
(Saros 149)
SE1946Jan03P.png
January 3, 1946
(Saros 150)
SE1974Dec13P.png
December 13, 1974
(Saros 151)
SE2003Nov23T.png
November 23, 2003
(Saros 152)
SE2032Nov03P.png
November 3, 2032
(Saros 153)
SE2061Oct13A.png
October 13, 2061
(Saros 154)
SE2090Sep23T.png
September 23, 2090
(Saros 155)
Saros156 07van69 SE2119Sep05P.jpg
September 5, 2119
(Saros 156)
Saros157 06van70 SE2148Aug14P.jpg
August 14, 2148
(Saros 157)
Saros158 07van70 SE2177Jul25P.jpg
July 25, 2177
(Saros 158)

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References

  1. "January 23, 1917 Partial Solar Eclipse". timeanddate. Retrieved 1 August 2024.
  2. "Partial Solar Eclipse of 1917 Jan 23". EclipseWise.com. Retrieved 1 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 149". eclipse.gsfc.nasa.gov.