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June 1964 lunar eclipse

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June 1964 lunar eclipse
Total eclipse
The Moon's hourly motion shown right to left
DateJune 25, 1964
Gamma−0.1461
Magnitude1.5565
Saros cycle129 (35 of 71)
Totality100 minutes, 47 seconds
Partiality233 minutes, 14 seconds
Penumbral372 minutes, 5 seconds
Contacts (UTC)
P122:00:11
U123:09:37
U20:15:51
Greatest1:06:14
U31:56:38
U43:02:52
P44:12:16

A total lunar eclipse occurred at the Moon’s descending node of orbit on Thursday, June 25, 1964,[1] with an umbral magnitude of 1.5565. It was a central lunar eclipse, in which part of the Moon passed through the center of the Earth's shadow. A lunar eclipse occurs when the Moon moves into the Earth's shadow, causing the Moon to be darkened. A total lunar eclipse occurs when the Moon's near side entirely passes into the Earth's umbral shadow. Unlike a solar eclipse, which can only be viewed from a relatively small area of the world, a lunar eclipse may be viewed from anywhere on the night side of Earth. A total lunar eclipse can last up to nearly two hours, while a total solar eclipse lasts only a few minutes at any given place, because the Moon's shadow is smaller. Occurring about 1.5 days after apogee (on June 23, 1964, at 12:30 UTC), the Moon's apparent diameter was smaller.[2]

Visibility

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The eclipse was completely visible over much of South America, western Europe, and west, central, and southern Africa, seen rising over much of North America and northwestern South America and setting over much of Europe, northeast Africa, the western half of Asia, and western Australia.[3]

Eclipse details

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Shown below is a table displaying details about this particular solar eclipse. It describes various parameters pertaining to this eclipse.[4]

June 25, 1964 Lunar Eclipse Parameters
Parameter Value
Penumbral Magnitude 2.62384
Umbral Magnitude 1.55649
Gamma −0.14611
Sun Right Ascension 06h15m16.1s
Sun Declination +23°23'50.0"
Sun Semi-Diameter 15'44.1"
Sun Equatorial Horizontal Parallax 08.7"
Moon Right Ascension 18h15m13.5s
Moon Declination -23°31'42.9"
Moon Semi-Diameter 14'44.5"
Moon Equatorial Horizontal Parallax 0°54'06.1"
ΔT 35.4 s

Eclipse season

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See also: Eclipse cycle

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

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Inex

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Triad

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Lunar eclipses of 1962–1965

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This eclipse is a member of a semester series. An eclipse in a semester series of lunar eclipses repeats approximately every 177 days and 4 hours (a semester) at alternating nodes of the Moon's orbit.[5]

The penumbral lunar eclipses on February 19, 1962 and August 15, 1962 occur in the previous lunar year eclipse set.

Lunar eclipse series sets from 1962 to 1965
Descending node   Ascending node
Saros Date
Viewing 		Type
Chart 		Gamma Saros Date
Viewing 		Type
Chart 		Gamma
109 1962 Jul 17
 Penumbral
 1.3371 114 1963 Jan 09
 Penumbral
 −1.0128
119 1963 Jul 06
 Partial
 0.6197 124 1963 Dec 30
 Total
 −0.2889
129 1964 Jun 25
 Total
 −0.1461 134 1964 Dec 19
 Total
 0.3801
139 1965 Jun 14
 Partial
 −0.9006 144 1965 Dec 08
 Penumbral
 1.0775

Saros 129

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This eclipse is a part of Saros series 129, repeating every 18 years, 11 days, and containing 71 events. The series started with a penumbral lunar eclipse on June 10, 1351. It contains partial eclipses from September 26, 1531 through May 11, 1892; total eclipses from May 24, 1910 through September 8, 2090; and a second set of partial eclipses from September 20, 2108 through April 26, 2469. The series ends at member 71 as a penumbral eclipse on July 24, 2613.

The longest duration of totality was produced by member 37 at 106 minutes, 24 seconds on July 16, 2000. All eclipses in this series occur at the Moon’s descending node of orbit.[6]

Greatest First

The greatest eclipse of the series occurred on 2000 Jul 16, lasting 106 minutes, 24 seconds.[7] 		Penumbral Partial Total Central
1351 Jun 10
 1531 Sep 26
 1910 May 24
 1946 Jun 14
Last
Central Total Partial Penumbral
2036 Aug 07
 2090 Sep 08
 2469 Apr 26
 2613 Jul 24

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.

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
1811 Sep 02
(Saros 115) 		1822 Aug 03
(Saros 116) 		1833 Jul 02
(Saros 117) 		1844 May 31
(Saros 118) 		1855 May 02
(Saros 119)
1866 Mar 31
(Saros 120) 		1877 Feb 27
(Saros 121) 		1888 Jan 28
(Saros 122) 		1898 Dec 27
(Saros 123) 		1909 Nov 27
(Saros 124)
1920 Oct 27
(Saros 125) 		1931 Sep 26
(Saros 126) 		1942 Aug 26
(Saros 127) 		1953 Jul 26
(Saros 128) 		1964 Jun 25
(Saros 129)
1975 May 25
(Saros 130) 		1986 Apr 24
(Saros 131) 		1997 Mar 24
(Saros 132) 		2008 Feb 21
(Saros 133) 		2019 Jan 21
(Saros 134)
2029 Dec 20
(Saros 135) 		2040 Nov 18
(Saros 136) 		2051 Oct 19
(Saros 137) 		2062 Sep 18
(Saros 138) 		2073 Aug 17
(Saros 139)
2084 Jul 17
(Saros 140) 		2095 Jun 17
(Saros 141) 		2106 May 17
(Saros 142) 		2117 Apr 16
(Saros 143) 		2128 Mar 16
(Saros 144)
2139 Feb 13
(Saros 145) 		2150 Jan 13
(Saros 146) 		2160 Dec 13
(Saros 147) 		2171 Nov 12
(Saros 148) 		2182 Oct 11
(Saros 149)
2193 Sep 11
(Saros 150)

Half-Saros cycle

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A lunar eclipse will be preceded and followed by solar eclipses by 9 years and 5.5 days (a half saros).[8] This lunar eclipse is related to two total solar eclipses of Solar Saros 136.

June 20, 1955 June 30, 1973

See also

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Notes

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  1. ^ "June 24–25, 1964 Total Lunar Eclipse (Blood Moon)". timeanddate. Retrieved 31 December 2024.
  2. ^ "Moon Distances for London, United Kingdom, England". timeanddate. Retrieved 31 December 2024.
  3. ^ "Total Lunar Eclipse of 1964 Jun 25" (PDF). NASA. Retrieved 31 December 2024.
  4. ^ "Total Lunar Eclipse of 1964 Jun 25". EclipseWise.com. Retrieved 31 December 2024.
  5. ^ 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.
  6. ^ "NASA - Catalog of Lunar Eclipses of Saros 129". eclipse.gsfc.nasa.gov.
  7. ^ Listing of Eclipses of series 129
  8. ^ Mathematical Astronomy Morsels, Jean Meeus, p.110, Chapter 18, The half-saros
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