Solar eclipse of December 14, 1917

Solar eclipse of December 14, 1917
Solar eclipse of December 14, 1917
	Map
Type of eclipse
Nature	Annular
Gamma	−0.9157
Magnitude	0.9791
Maximum eclipse
Duration	77 s (1 min 17 s)
Coordinates	88°00′S 124°48′E / 88°S 124.8°E
Max. width of band	189 km (117 mi)
Times (UTC)
Greatest eclipse	9:27:20
References
Saros	121 (55 of 71)
Catalog # (SE5000)	9323

An annular solar eclipse occurred on Friday, December 14, 1917. 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.

This annular eclipse is notable in that the path of annularity passed over the South Pole.

Related eclipses[edit]

Solar eclipses 1916–1920[edit]

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.^[1]

Solar eclipse series sets from 1916 to 1920
Ascending node		Descending node
111	December 24, 1916 Partial	116	June 19, 1917 Partial
121	December 14, 1917 Annular	126	June 8, 1918 Total
131	December 3, 1918 Annular	136	May 29, 1919 Total
141	November 22, 1919 Annular	146	May 18, 1920 Partial
151	November 10, 1920 Partial

Saros 121[edit]

Solar saros 121, repeating every about 18 years, 11 days, and 8 hours, contains 71 events. The series started with a partial solar eclipse on April 25, 944. It contains total eclipses from July 10, 1070, to October 9, 1809. It contains hybrid eclipses on October 20, 1827, and October 30, 1845. It contains annular eclipses from November 11, 1863, to February 28, 2044. The series ends at member 71 as a partial eclipse on June 7, 2206. The longest total eclipse occurred on June 21, 1629, with greatest duration of totality at 6 minutes and 20 seconds. The longest annular eclipse will occur on February 28, 2044, with greatest duration of annularity at 2 minutes and 27 seconds.^[2]

Series members 49–65 occur between 1801 and 2100:
49	50	51
October 9, 1809	October 20, 1827	October 30, 1845
52	53	54
November 11, 1863	November 21, 1881	December 3, 1899
55	56	57
December 14, 1917	December 25, 1935	January 5, 1954
58	59	60
January 16, 1972	January 26, 1990	February 7, 2008
61	62	63
February 17, 2026	February 28, 2044	March 11, 2062
64	65
March 21, 2080	April 1, 2098

Metonic series[edit]

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).

22 eclipse events between December 13, 1898 and July 20, 1982
December 13–14	October 1–2	July 20–21	May 9	February 24–25
111	113	115	117	119
December 13, 1898		July 21, 1906	May 9, 1910	February 25, 1914
121	123	125	127	129
December 14, 1917	October 1, 1921	July 20, 1925	May 9, 1929	February 24, 1933
131	133	135	137	139
December 13, 1936	October 1, 1940	July 20, 1944	May 9, 1948	February 25, 1952
141	143	145	147	149
December 14, 1955	October 2, 1959	July 20, 1963	May 9, 1967	February 25, 1971
151	153	155
December 13, 1974	October 2, 1978	July 20, 1982