Solar eclipse of July 9, 1964 (original) (raw)

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20th-century partial solar eclipse

Solar eclipse of July 9, 1964

Partial eclipse
Map
Gamma 1.3623
Magnitude 0.3221
Maximum eclipse
Coordinates 67°36′N 172°54′W / 67.6°N 172.9°W / 67.6; -172.9
Times (UTC)
Greatest eclipse 11:17:53
References
Saros 155 (3 of 71)
Catalog # (SE5000) 9429
← June 10, 1964December 4, 1964 →

A partial solar eclipse occurred at the Moon's ascending node of orbit on Thursday, July 9, 1964,[1] with a magnitude of 0.3221. 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 third of four partial solar eclipses in 1964, with the others occurring on January 14, June 10, and December 4.

A partial eclipse was visible for parts of Canada, Greenland, and the eastern Soviet Union.

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]

July 9, 1964 Solar Eclipse Times

Event Time (UTC)
First Penumbral External Contact 1964 July 9 at 10:05:53.0 UTC
Equatorial Conjunction 1964 July 9 at 11:13:17.6 UTC
Greatest Eclipse 1964 July 9 at 11:17:53.0 UTC
Ecliptic Conjunction 1964 July 9 at 11:31:22.2 UTC
Last Penumbral External Contact 1964 July 9 at 12:29:56.9 UTC

July 9, 1964 Solar Eclipse Parameters

Parameter Value
Eclipse Magnitude 0.32215
Eclipse Obscuration 0.21157
Gamma 1.36228
Sun Right Ascension 07h14m49.0s
Sun Declination +22°19'48.2"
Sun Semi-Diameter 15'43.9"
Sun Equatorial Horizontal Parallax 08.6"
Moon Right Ascension 07h15m00.8s
Moon Declination +23°42'32.7"
Moon Semi-Diameter 16'35.8"
Moon Equatorial Horizontal Parallax 1°00'54.7"
ΔT 35.4 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. The first and last eclipse in this sequence is separated by one synodic month.

Eclipse season of June–July 1964

June 10Ascending node (new moon) June 25Descending node (full moon) July 9Ascending node (new moon)
Partial solar eclipseSolar Saros 117 Total lunar eclipseLunar Saros 129 Partial solar eclipseSolar Saros 155

Solar eclipses of 1961–1964

[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.[3]

The partial solar eclipses on June 10, 1964 and December 4, 1964 occur in the next lunar year eclipse set.

Solar eclipse series sets from 1961 to 1964
Descending node Ascending node
Saros Map Gamma Saros Map Gamma
120 February 15, 1961Total 0.883 125 August 11, 1961Annular −0.8859
130 February 5, 1962Total 0.2107 135 July 31, 1962Annular −0.113
140 January 25, 1963Annular −0.4898 145 July 20, 1963Total 0.6571
150 January 14, 1964Partial −1.2354 155 July 9, 1964Partial 1.3623

This eclipse is a part of Saros series 155, repeating every 18 years, 11 days, and containing 71 events. The series started with a partial solar eclipse on June 17, 1928. It contains total eclipses from September 12, 2072 through August 30, 2649; hybrid eclipses from September 10, 2667 through October 2, 2703; and annular eclipses from October 13, 2721 through May 8, 3064. The series ends at member 71 as a partial eclipse on July 24, 3190. 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 14 at 4 minutes, 5 seconds on November 6, 2162, and the longest duration of annularity will be produced by member 63 at 5 minutes, 31 seconds on April 28, 3046. All eclipses in this series occur at the Moon’s ascending node of orbit.[4]

Series members 1–16 occur between 1928 and 2200:
1 2 3
June 17, 1928 June 29, 1946 July 9, 1964
4 5 6
July 20, 1982 July 31, 2000 August 11, 2018
7 8 9
August 21, 2036 September 2, 2054 September 12, 2072
10 11 12
September 23, 2090 October 5, 2108 October 16, 2126
13 14 15
October 26, 2144 November 7, 2162 November 17, 2180
16
November 28, 2198

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 December 2, 1880 and July 9, 1964
December 2–3 September 20–21 July 9–10 April 26–28 February 13–14
111 113 115 117 119
December 2, 1880 July 9, 1888 April 26, 1892 February 13, 1896
121 123 125 127 129
December 3, 1899 September 21, 1903 July 10, 1907 April 28, 1911 February 14, 1915
131 133 135 137 139
December 3, 1918 September 21, 1922 July 9, 1926 April 28, 1930 February 14, 1934
141 143 145 147 149
December 2, 1937 September 21, 1941 July 9, 1945 April 28, 1949 February 14, 1953
151 153 155
December 2, 1956 September 20, 1960 July 9, 1964

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 1964
September 17, 1811(Saros 141) August 16, 1822(Saros 142) July 17, 1833(Saros 143) June 16, 1844(Saros 144) May 16, 1855(Saros 145)
April 15, 1866(Saros 146) March 15, 1877(Saros 147) February 11, 1888(Saros 148) January 11, 1899(Saros 149) December 12, 1909(Saros 150)
November 10, 1920(Saros 151) October 11, 1931(Saros 152) September 10, 1942(Saros 153) August 9, 1953(Saros 154) July 9, 1964(Saros 155)

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 1964
October 19, 1819(Saros 150) September 27, 1848(Saros 151) September 7, 1877(Saros 152)
August 20, 1906(Saros 153) July 30, 1935(Saros 154) July 9, 1964(Saros 155)
  1. ^ "July 9, 1964 Partial Solar Eclipse". timeanddate. Retrieved 7 August 2024.
  2. ^ "Partial Solar Eclipse of 1964 Jul 09". 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 155". eclipse.gsfc.nasa.gov.