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Solar eclipse of December 4, 1964

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Solar eclipse of December 4, 1964
Map
Type of eclipse
NaturePartial
Gamma1.1193
Magnitude0.7518
Maximum eclipse
Coordinates64°18′N 173°18′W / 64.3°N 173.3°W / 64.3; -173.3
Times (UTC)
Greatest eclipse1:31:54
References
Saros122 (55 of 70)
Catalog # (SE5000)9431

A partial solar eclipse occurred at the Moon's descending node of orbit between Thursday, December 3 and Friday, December 4, 1964,[1] with a magnitude of 0.7518. 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 last of four partial solar eclipses in 1964, with the others occurring on January 14, June 10, and July 9.

A partial eclipse was visible for parts of Northeast Asia, southwest Alaska, and Hawaii.

Eclipse details

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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]

December 4, 1964 Solar Eclipse Times
Event Time (UTC)
First Penumbral External Contact 1964 December 03 at 23:21:15.6 UTC
Equatorial Conjunction 1964 December 04 at 01:00:31.0 UTC
Ecliptic Conjunction 1964 December 04 at 01:18:47.3 UTC
Greatest Eclipse 1964 December 04 at 01:31:54.2 UTC
Last Penumbral External Contact 1964 December 04 at 03:42:48.7 UTC
December 4, 1964 Solar Eclipse Parameters
Parameter Value
Eclipse Magnitude 0.75179
Eclipse Obscuration 0.66267
Gamma 1.11929
Sun Right Ascension 16h41m43.6s
Sun Declination -22°13'30.4"
Sun Semi-Diameter 16'13.7"
Sun Equatorial Horizontal Parallax 08.9"
Moon Right Ascension 16h42m43.4s
Moon Declination -21°14'34.6"
Moon Semi-Diameter 14'46.7"
Moon Equatorial Horizontal Parallax 0°54'14.3"
ΔT 35.7 s

Eclipse season

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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 1964
December 4
Descending node (new moon)
December 19
Ascending node (full moon)
Partial solar eclipse
Solar Saros 122
Total lunar eclipse
Lunar Saros 134
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Eclipses in 1964

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Metonic

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Tzolkinex

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Half-Saros

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Tritos

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Solar Saros 122

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Inex

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Triad

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Solar eclipses of 1964–1967

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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 January 14, 1964 and July 9, 1964 occur in the previous lunar year eclipse set.

Solar eclipse series sets from 1964 to 1967
Ascending node   Descending node
Saros Map Gamma Saros Map Gamma
117 June 10, 1964

Partial
−1.1393 122 December 4, 1964

Partial
1.1193
127 May 30, 1965

Total
−0.4225 132 November 23, 1965

Annular
0.3906
137 May 20, 1966

Annular
0.3467 142 November 12, 1966

Total
−0.33
147 May 9, 1967

Partial
1.1422 152 November 2, 1967

Total (non-central)
1.0007

Saros 122

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This eclipse is a part of Saros series 122, repeating every 18 years, 11 days, and containing 70 events. The series started with a partial solar eclipse on April 17, 991 AD. It contains total eclipses from July 12, 1135 through August 3, 1171; hybrid eclipses on August 13, 1189 and August 25, 1207; and annular eclipses from September 4, 1225 through October 10, 1874. The series ends at member 70 as a partial eclipse on May 17, 2235. 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 was produced by member 9 at 1 minutes, 25 seconds on July 12, 1135, and the longest duration of annularity was produced by member 50 at 6 minutes, 28 seconds on October 10, 1874. All eclipses in this series occur at the Moon’s descending node of orbit.[4]

Series members 46–68 occur between 1801 and 2200:
46 47 48

August 28, 1802

September 7, 1820

September 18, 1838
49 50 51

September 29, 1856

October 10, 1874

October 20, 1892
52 53 54

November 2, 1910

November 12, 1928

November 23, 1946
55 56 57

December 4, 1964

December 15, 1982

December 25, 2000
58 59 60

January 6, 2019

January 16, 2037

January 27, 2055
61 62 63

February 7, 2073

February 18, 2091

March 1, 2109
64 65 66

March 13, 2127

March 23, 2145

April 3, 2163
67 68

April 14, 2181

April 25, 2199

Metonic series

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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

Tritos series

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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

March 14, 1801
(Saros 107)

February 12, 1812
(Saros 108)

January 12, 1823
(Saros 109)

November 10, 1844
(Saros 111)

August 9, 1877
(Saros 114)

July 9, 1888
(Saros 115)

June 8, 1899
(Saros 116)

May 9, 1910
(Saros 117)

April 8, 1921
(Saros 118)

March 7, 1932
(Saros 119)

February 4, 1943
(Saros 120)

January 5, 1954
(Saros 121)

December 4, 1964
(Saros 122)

November 3, 1975
(Saros 123)

October 3, 1986
(Saros 124)

September 2, 1997
(Saros 125)

August 1, 2008
(Saros 126)

July 2, 2019
(Saros 127)

June 1, 2030
(Saros 128)

April 30, 2041
(Saros 129)

March 30, 2052
(Saros 130)

February 28, 2063
(Saros 131)

January 27, 2074
(Saros 132)

December 27, 2084
(Saros 133)

November 27, 2095
(Saros 134)

October 26, 2106
(Saros 135)

September 26, 2117
(Saros 136)

August 25, 2128
(Saros 137)

July 25, 2139
(Saros 138)

June 25, 2150
(Saros 139)

May 25, 2161
(Saros 140)

April 23, 2172
(Saros 141)

March 23, 2183
(Saros 142)

February 21, 2194
(Saros 143)

Inex series

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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

March 14, 1820
(Saros 117)

February 23, 1849
(Saros 118)

February 2, 1878
(Saros 119)

January 14, 1907
(Saros 120)

December 25, 1935
(Saros 121)

December 4, 1964
(Saros 122)

November 13, 1993
(Saros 123)

October 25, 2022
(Saros 124)

October 4, 2051
(Saros 125)

September 13, 2080
(Saros 126)

August 26, 2109
(Saros 127)

August 5, 2138
(Saros 128)

July 16, 2167
(Saros 129)

June 26, 2196
(Saros 130)

References

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  1. ^ "December 3–4, 1964 Partial Solar Eclipse". timeanddate. Retrieved 7 August 2024.
  2. ^ "Partial Solar Eclipse of 1964 Dec 04". EclipseWise.com. Retrieved 7 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 122". eclipse.gsfc.nasa.gov.
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