Solar eclipse of July 10, 1972

63°30′N 94°12′W / 63.5°N 94.2°W / 63.5; -94.2Max. width of band175 km (109 mi)Times (UTC)Greatest eclipse19:46:38ReferencesSaros126 (45 of 72)Catalog # (SE5000)9448

A total solar eclipse occurred at the Moon's descending node of orbit between Monday, July 10 and Tuesday, July 11, 1972,^[1] with a magnitude of 1.0379. 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 2.8 days after perigee (on July 7, 1972, at 23:50 UTC), the Moon's apparent diameter was larger.^[2]

It was visible as a total eclipse along a path of totality that began in Sea of Okhotsk and traversed the far eastern portions of the Soviet Union (which now belongs to Russia) on July 11 local time, northern Alaska in the United States, Northern Canada, eastern Quebec and the Canadian Maritimes on July 10 local time. A partial eclipse was visible for parts of the northern Soviet Union, North America, the Caribbean, northern South America, and Northern Europe.

The eclipse was mostly seen on July 10, 1972, except for the Asian part of Soviet Union and Japanese island Hokkaido, where either a partial or a total eclipse was seen on July 11 local time, and part of the Soviet Union along the coast of Kara Sea, where a partial eclipse started on July 10, passing midnight and ended on July 11 due to the midnight sun.

A team of the Academy of Sciences of the Soviet Union observed the total solar eclipse in Russkaya Koshka, Magadan Oblast (now separated into Chukotka Autonomous Okrug) on the coast of Gulf of Anadyr. The weather condition was clear, and the team successfully took images of the corona and made polarization observations to study its structure and physical characteristics.^[3] In Nova Scotia, Canada, the eclipse was clouded out and could not be observed. Besides that, 850 passengers boarded a cruise ship from New York City and saw a total eclipse successfully in North Atlantic Ocean. Many scientists also boarded the ship and did research, and some also gave classes in meteorology, oceanography, etc., which almost all passengers attended.^[4][5]

The eclipse is referenced in the lyrics of Carly Simon's 1972 hit song "You're So Vain." The subject of the song, after witnessing his racehorse win "naturally" at the Saratoga Race Course, flies his Learjet to Nova Scotia to see the eclipse; Simon uses the two phenomena as examples of how the subject seems to be "where (he) should be all the time." Simon released the song four months after the eclipse.^[6]

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.^[7]

July 10, 1972 Solar Eclipse Times

Event	Time (UTC)
First Penumbral External Contact	1972 July 10 at 17:19:47.5 UTC
First Umbral External Contact	1972 July 10 at 18:28:23.8 UTC
First Central Line	1972 July 10 at 18:29:24.0 UTC
First Umbral Internal Contact	1972 July 10 at 18:30:24.5 UTC
Equatorial Conjunction	1972 July 10 at 19:29:05.3 UTC
Ecliptic Conjunction	1972 July 10 at 19:39:28.3 UTC
Greatest Duration	1972 July 10 at 19:43:47.8 UTC
Greatest Eclipse	1972 July 10 at 19:46:38.1 UTC
Last Umbral Internal Contact	1972 July 10 at 21:03:06.0 UTC
Last Central Line	1972 July 10 at 21:04:04.1 UTC
Last Umbral External Contact	1972 July 10 at 21:05:01.8 UTC
Last Penumbral External Contact	1972 July 10 at 22:13:41.2 UTC

July 10, 1972 Solar Eclipse Parameters

Parameter	Value
Eclipse Magnitude	1.03790
Eclipse Obscuration	1.07723
Gamma	0.68719
Sun Right Ascension	07h20m39.3s
Sun Declination	+22°08'59.1"
Sun Semi-Diameter	15'43.9"
Sun Equatorial Horizontal Parallax	08.6"
Moon Right Ascension	07h21m20.3s
Moon Declination	+22°48'27.6"
Moon Semi-Diameter	16'08.2"
Moon Equatorial Horizontal Parallax	0°59'13.3"
ΔT	42.8 s

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 July 1972

July 10 Descending node (new moon)	July 26 Ascending node (full moon)
Total solar eclipse Solar Saros 126	Partial lunar eclipse Lunar Saros 138

• An annular solar eclipse on January 16.
• A total lunar eclipse on January 30.
• A total solar eclipse on July 10.
• A partial lunar eclipse on July 26.

• Preceded by: Solar eclipse of September 22, 1968
• Followed by: Solar eclipse of April 29, 1976

• Preceded by: Solar eclipse of May 30, 1965
• Followed by: Solar eclipse of August 22, 1979

• Preceded by: Lunar eclipse of July 6, 1963
• Followed by: Lunar eclipse of July 17, 1981

• Preceded by: Solar eclipse of August 11, 1961
• Followed by: Solar eclipse of June 11, 1983

• Preceded by: Solar eclipse of June 30, 1954
• Followed by: Solar eclipse of July 22, 1990

• Preceded by: Solar eclipse of August 1, 1943
• Followed by: Solar eclipse of June 21, 2001

• Preceded by: Solar eclipse of September 8, 1885
• Followed by: Solar eclipse of May 11, 2059

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.^[8]

The partial solar eclipses on February 25, 1971 and August 20, 1971 occur in the previous lunar year eclipse set.

Solar eclipse series sets from 1971 to 1974
Descending node				Ascending node
Saros	Map	Gamma		Saros	Map	Gamma
116	July 22, 1971 Partial	1.513		121	January 16, 1972 Annular	−0.9365
126	July 10, 1972 Total	0.6872		131	January 4, 1973 Annular	−0.2644
136	June 30, 1973 Total	−0.0785		141	December 24, 1973 Annular	0.4171
146	June 20, 1974 Total	−0.8239		151	December 13, 1974 Partial	1.0797

This eclipse is a part of Saros series 126, repeating every 18 years, 11 days, and containing 72 events. The series started with a partial solar eclipse on March 10, 1179. It contains annular eclipses from June 4, 1323 through April 4, 1810; hybrid eclipses from April 14, 1828 through May 6, 1864; and total eclipses from May 17, 1882 through August 23, 2044. The series ends at member 72 as a partial eclipse on May 3, 2459. 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 11 at 6 minutes, 30 seconds on June 26, 1359, and the longest duration of totality was produced by member 45 at 2 minutes, 36 seconds on July 10, 1972. All eclipses in this series occur at the Moon’s descending node of orbit.^[9]

Series members 36–57 occur between 1801 and 2200:
36	37	38
April 4, 1810	April 14, 1828	April 25, 1846
39	40	41
May 6, 1864	May 17, 1882	May 28, 1900
42	43	44
June 8, 1918	June 19, 1936	June 30, 1954
45	46	47
July 10, 1972	July 22, 1990	August 1, 2008
48	49	50
August 12, 2026	August 23, 2044	September 3, 2062
51	52	53
September 13, 2080	September 25, 2098	October 6, 2116
54	55	56
October 17, 2134	October 28, 2152	November 8, 2170
57
November 18, 2188

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.

21 eclipse events between July 11, 1953 and July 11, 2029
July 10–11	April 29–30	February 15–16	December 4	September 21–23
116	118	120	122	124
July 11, 1953	April 30, 1957	February 15, 1961	December 4, 1964	September 22, 1968
126	128	130	132	134
July 10, 1972	April 29, 1976	February 16, 1980	December 4, 1983	September 23, 1987
136	138	140	142	144
July 11, 1991	April 29, 1995	February 16, 1999	December 4, 2002	September 22, 2006
146	148	150	152	154
July 11, 2010	April 29, 2014	February 15, 2018	December 4, 2021	September 21, 2025
156
July 11, 2029

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
October 19, 1808 (Saros 111)	September 19, 1819 (Saros 112)	August 18, 1830 (Saros 113)	July 18, 1841 (Saros 114)	June 17, 1852 (Saros 115)
May 17, 1863 (Saros 116)	April 16, 1874 (Saros 117)	March 16, 1885 (Saros 118)	February 13, 1896 (Saros 119)	January 14, 1907 (Saros 120)
December 14, 1917 (Saros 121)	November 12, 1928 (Saros 122)	October 12, 1939 (Saros 123)	September 12, 1950 (Saros 124)	August 11, 1961 (Saros 125)
July 10, 1972 (Saros 126)	June 11, 1983 (Saros 127)	May 10, 1994 (Saros 128)	April 8, 2005 (Saros 129)	March 9, 2016 (Saros 130)
February 6, 2027 (Saros 131)	January 5, 2038 (Saros 132)	December 5, 2048 (Saros 133)	November 5, 2059 (Saros 134)	October 4, 2070 (Saros 135)
September 3, 2081 (Saros 136)	August 3, 2092 (Saros 137)	July 4, 2103 (Saros 138)	June 3, 2114 (Saros 139)	May 3, 2125 (Saros 140)
April 1, 2136 (Saros 141)	March 2, 2147 (Saros 142)	January 30, 2158 (Saros 143)	December 29, 2168 (Saros 144)	November 28, 2179 (Saros 145)
October 29, 2190 (Saros 146)

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
October 20, 1827 (Saros 121)	September 29, 1856 (Saros 122)	September 8, 1885 (Saros 123)
August 21, 1914 (Saros 124)	August 1, 1943 (Saros 125)	July 10, 1972 (Saros 126)
June 21, 2001 (Saros 127)	June 1, 2030 (Saros 128)	May 11, 2059 (Saros 129)
April 21, 2088 (Saros 130)	April 2, 2117 (Saros 131)	March 12, 2146 (Saros 132)
February 21, 2175 (Saros 133)

• Earth visibility chart and eclipse statistics Eclipse Predictions by Fred Espenak, NASA/GSFC
  • Google interactive map
  • Besselian elements
• Foto solar eclipse of July 10, 1972 in Russia Archived August 8, 2009, at the Wayback Machine
• Foto solar eclipse of July 10, 1972 in Russia (2)
• Image solar eclipse of July 10, 1972