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Solar eclipse of January 4, 2011
Solar eclipse of January 4, 2011
	Partial from Poland
	Map
Type of eclipse
Nature	Partial
Gamma	1.0627
Magnitude	0.8576
Maximum eclipse
Coordinates	64°42′N 20°48′E / 64.7°N 20.8°E
Times (UTC)
(P1) Partial begin	6:40:11
Greatest eclipse	8:51:42
(P4) Partial end	11:00:52
References
Saros	151 (14 of 72)
Catalog # (SE5000)	9531

A partial solar eclipse occurred at the Moon’s ascending node of orbit on Tuesday, January 4, 2011,^[1]^[2]^[3] with a magnitude of 0.8576. 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.

This was the first of four partial solar eclipses in 2011, with the others occurring on June 1, July 1, and November 25.

The greatest eclipse occurred at 08:51 UTC in northern Sweden. At that time, the axis of the Moon's shadow passed a mere 510 km above Earth's surface.^[4]

The eclipse was visible near sunrise over most of Europe before moving over central Asia. It ended at sunset over east Asia. It was visible as a minor partial eclipse over north Africa and the Middle East.

Visibility

Animated path

Photo gallery

Slobozia, Romania at 7:52 UTC
Almería, Spain at 8:03 UTC
Avellino, Italy at 8:18 UTC
Ebersberg, Germany at 8:32 UTC
Composite image from Bernau am Chiemsee, Germany
Vienna, Austria at 8:34 UTC
Stockholm, Sweden at 8:36 UTC
Marki, Poland at 8:38 UTC
Progression from Katowice, Poland
Petrov nad Desnou, Czech Republic at 8:41 UTC
Bratislava, Slovakia at 8:43 UTC
Tomsk, Russia at 8:44 UTC
Video from Moscow, Russia
Sana'a, Yemen at 8:47 UTC
From Moscow, Russia at 9:02 UTC.
Eclipse and Airbus A319 in Moscow Oblast at 9:05 UTC
Kirkcaldy, Scotland at 9:14 UTC
Haarlem, Netherlands, 9:29 UTC

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.^[5]

January 4, 2011 Solar Eclipse Times
Event	Time (UTC)
First Penumbral External Contact	2011 January 04 at 06:41:18.7 UTC
Greatest Eclipse	2011 January 04 at 08:51:42.4 UTC
Ecliptic Conjunction	2011 January 04 at 09:03:43.1 UTC
Equatorial Conjunction	2011 January 04 at 09:16:20.6 UTC
Last Penumbral External Contact	2011 January 04 at 11:02:01.4 UTC

January 4, 2011 Solar Eclipse Parameters
Parameter	Value
Eclipse Magnitude	0.85759
Eclipse Obscuration	0.79839
Gamma	1.06265
Sun Right Ascension	18h59m14.9s
Sun Declination	-22°44'21.1"
Sun Semi-Diameter	16'15.9"
Sun Equatorial Horizontal Parallax	08.9"
Moon Right Ascension	18h58m23.8s
Moon Declination	-21°46'01.2"
Moon Semi-Diameter	15'18.1"
Moon Equatorial Horizontal Parallax	0°56'09.6"
ΔT	66.3 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 December 2010–January 2011
December 21 Descending node (full moon)	January 4 Ascending node (new moon)

Total lunar eclipse Lunar Saros 125	Partial solar eclipse Solar Saros 151

Related eclipses

Solar eclipses of 2008–2011

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.^[6]

The partial solar eclipses on June 1, 2011 and November 25, 2011 occur in the next lunar year eclipse set.

Solar eclipse series sets from 2008 to 2011
Ascending node			Descending node
Saros	Map	Gamma	Saros	Map	Gamma
121 Partial in Christchurch, New Zealand	February 7, 2008 Annular	−0.95701	126 Totality in Kumul, Xinjiang, China	August 1, 2008 Total	0.83070
131 Annularity in Palangka Raya, Indonesia	January 26, 2009 Annular	−0.28197	136 Totality in Kurigram District, Bangladesh	July 22, 2009 Total	0.06977
141 Annularity in Jinan, Shandong, China	January 15, 2010 Annular	0.40016	146 Totality in Hao, French Polynesia	July 11, 2010 Total	−0.67877
151 Partial in Poland	January 4, 2011 Partial	1.06265	156	July 1, 2011 Partial	−1.49171

Saros 151

This eclipse is a part of Saros series 151, repeating every 18 years, 11 days, and containing 72 events. The series started with a partial solar eclipse on August 14, 1776. It contains annular eclipses from February 28, 2101 through April 23, 2191; a hybrid eclipse on May 5, 2209; and total eclipses from May 16, 2227 through July 6, 2912. The series ends at member 72 as a partial eclipse on October 1, 3056. 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 will be produced by member 19 at 2 minutes, 44 seconds on February 28, 2101, and the longest duration of totality will be produced by member 60 at 5 minutes, 41 seconds on May 22, 2840. All eclipses in this series occur at the Moon’s ascending node of orbit.^[7]

Series members 3–24 occur between 1801 and 2200:
3	4	5
September 5, 1812	September 17, 1830	September 27, 1848
6	7	8
October 8, 1866	October 19, 1884	October 31, 1902
9	10	11
November 10, 1920	November 21, 1938	December 2, 1956
12	13	14
December 13, 1974	December 24, 1992	January 4, 2011
15	16	17
January 14, 2029	January 26, 2047	February 5, 2065
18	19	20
February 16, 2083	February 28, 2101	March 11, 2119
21	22	23
March 21, 2137	April 2, 2155	April 12, 2173
24
April 23, 2191

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 January 5, 1935 and August 11, 2018
January 4–5	October 23–24	August 10–12	May 30–31	March 18–19
111	113	115	117	119
January 5, 1935		August 12, 1942	May 30, 1946	March 18, 1950
121	123	125	127	129
January 5, 1954	October 23, 1957	August 11, 1961	May 30, 1965	March 18, 1969
131	133	135	137	139
January 4, 1973	October 23, 1976	August 10, 1980	May 30, 1984	March 18, 1988
141	143	145	147	149
January 4, 1992	October 24, 1995	August 11, 1999	May 31, 2003	March 19, 2007
151	153	155
January 4, 2011	October 23, 2014	August 11, 2018

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 2087
August 17, 1803 (Saros 132)	July 17, 1814 (Saros 133)	June 16, 1825 (Saros 134)	May 15, 1836 (Saros 135)	April 15, 1847 (Saros 136)
March 15, 1858 (Saros 137)	February 11, 1869 (Saros 138)	January 11, 1880 (Saros 139)	December 12, 1890 (Saros 140)	November 11, 1901 (Saros 141)
October 10, 1912 (Saros 142)	September 10, 1923 (Saros 143)	August 10, 1934 (Saros 144)	July 9, 1945 (Saros 145)	June 8, 1956 (Saros 146)
May 9, 1967 (Saros 147)	April 7, 1978 (Saros 148)	March 7, 1989 (Saros 149)	February 5, 2000 (Saros 150)	January 4, 2011 (Saros 151)
December 4, 2021 (Saros 152)	November 3, 2032 (Saros 153)	October 3, 2043 (Saros 154)	September 2, 2054 (Saros 155)	August 2, 2065 (Saros 156)
July 1, 2076 (Saros 157)	June 1, 2087 (Saros 158)

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
May 25, 1808 (Saros 144)	May 4, 1837 (Saros 145)	April 15, 1866 (Saros 146)
March 26, 1895 (Saros 147)	March 5, 1924 (Saros 148)	February 14, 1953 (Saros 149)
January 24, 1982 (Saros 150)	January 4, 2011 (Saros 151)	December 15, 2039 (Saros 152)
November 24, 2068 (Saros 153)	November 4, 2097 (Saros 154)	October 16, 2126 (Saros 155)
September 26, 2155 (Saros 156)	September 4, 2184 (Saros 157)