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August 1970 lunar eclipse

August 1970 lunar eclipse
Partial eclipse
The Moon's hourly motion shown right to left
DateAugust 17, 1970
Gamma−0.8053
Magnitude0.4080
Saros cycle118 (49 of 74)
Partiality132 minutes, 21 seconds
Penumbral270 minutes, 36 seconds
Contacts (UTC)
P11:08:06
U12:17:45
Greatest3:23:25
U44:29:06
P45:38:42

A partial lunar eclipse occurred at the Moon’s ascending node of orbit on Monday, August 17, 1970,[1] with an umbral magnitude of 0.4080. A lunar eclipse occurs when the Moon moves into the Earth's shadow, causing the Moon to be darkened. A partial lunar eclipse occurs when one part of the Moon is in the Earth's umbra, while the other part is in the Earth's penumbra. 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. Occurring only about 4 hours before perigee (on August 17, 1970, at 7:35 UTC), the Moon's apparent diameter was larger.[2]

Visibility

The eclipse was completely visible over eastern North America, South America, west Africa, and Antarctica, seen rising over western North America and the central Pacific Ocean and setting over Europe, much of Africa, and the Middle East.[3]

Eclipse details

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

August 17, 1970 Lunar Eclipse Parameters
Parameter Value
Penumbral Magnitude 1.35215
Umbral Magnitude 0.40797
Gamma −0.80534
Sun Right Ascension 09h44m32.9s
Sun Declination +13°35'06.2"
Sun Semi-Diameter 15'47.9"
Sun Equatorial Horizontal Parallax 08.7"
Moon Right Ascension 21h45m58.7s
Moon Declination -14°19'57.2"
Moon Semi-Diameter 16'43.9"
Moon Equatorial Horizontal Parallax 1°01'24.5"
ΔT 40.8 s

Eclipse season

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.

Eclipse season of August 1970
August 17
Ascending node (full moon)
 August 31
Descending node (new moon)
Partial lunar eclipse
Lunar Saros 118		 Annular solar eclipse
Solar Saros 144

Eclipses in 1970

Metonic

Tzolkinex

Half-Saros

Tritos

Lunar Saros 118

Inex

Triad

Lunar eclipses of 1969–1973

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 April 2, 1969 and September 25, 1969 occur in the previous lunar year eclipse set, and the lunar eclipses on June 15, 1973 (penumbral) and December 10, 1973 (partial) occur in the next lunar year eclipse set.

Lunar eclipse series sets from 1969 to 1973
Ascending node   Descending node
Saros Date
Viewing 		Type
Chart 		Gamma Saros Date
Viewing 		Type
Chart 		Gamma
108 1969 Aug 27
 Penumbral
 −1.5407 113 1970 Feb 21
 Partial
 0.9620
118 1970 Aug 17
 Partial
 −0.8053 123 1971 Feb 10
 Total
 0.2741
128 1971 Aug 06
 Total
 −0.0794 133 1972 Jan 30
 Total
 −0.4273
138 1972 Jul 26
 Partial
 0.7117 143 1973 Jan 18
 Penumbral
 −1.0845
148 1973 Jul 15
 Penumbral
 1.5178

Metonic series

The Metonic cycle repeats nearly exactly every 19 years and represents a Saros cycle plus one lunar year. Because it occurs on the same calendar date, the Earth's shadow will in nearly the same location relative to the background stars.

Metonic lunar eclipse sets 1951–2027
Descending node   Ascending node
Saros Date Type Saros Date Type
103 1951 Feb 21.88 Penumbral 108 1951 Aug 17.13 Penumbral
113 1970 Feb 21.35 Partial 118 1970 Aug 17.14 Partial
123 1989 Feb 20.64 Total 128 1989 Aug 17.13 Total
133 2008 Feb 21.14 Total 138 2008 Aug 16.88 Partial
143 2027 Feb 20.96 Penumbral 148 2027 Aug 17.30 Penumbral

Saros 118

This eclipse is a part of Saros series 118, repeating every 18 years, 11 days, and containing 73 events. The series started with a penumbral lunar eclipse on March 2, 1105. It contains partial eclipses from June 8, 1267 through August 12, 1375; total eclipses from August 22, 1393 through June 22, 1880; and a second set of partial eclipses from July 3, 1898 through September 18, 2024. The series ends at member 73 as a penumbral eclipse on May 7, 2403.

The longest duration of totality was produced by member 37 at 99 minutes, 22 seconds on April 7, 1754. All eclipses in this series occur at the Moon’s ascending node of orbit.[6]

Greatest First
The greatest eclipse of the series occurred on 1754 Apr 07, lasting 99 minutes, 22 seconds.[7] Penumbral Partial Total Central
1105 Mar 02
 1267 Jun 08
 1393 Aug 22
 1465 Oct 04
Last
Central Total Partial Penumbral
1826 May 21
 1880 Jun 22
 2024 Sep 18
 2403 May 07

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

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
1806 Nov 26
(Saros 103) 		1828 Sep 23
(Saros 105) 		1839 Aug 24
(Saros 106) 		1850 Jul 24
(Saros 107)
1861 Jun 22
(Saros 108) 		1872 May 22
(Saros 109) 		1883 Apr 22
(Saros 110) 		1894 Mar 21
(Saros 111) 		1905 Feb 19
(Saros 112)
1916 Jan 20
(Saros 113) 		1926 Dec 19
(Saros 114) 		1937 Nov 18
(Saros 115) 		1948 Oct 18
(Saros 116) 		1959 Sep 17
(Saros 117)
1970 Aug 17
(Saros 118) 		1981 Jul 17
(Saros 119) 		1992 Jun 15
(Saros 120) 		2003 May 16
(Saros 121) 		2014 Apr 15
(Saros 122)
2025 Mar 14
(Saros 123) 		2036 Feb 11
(Saros 124) 		2047 Jan 12
(Saros 125) 		2057 Dec 11
(Saros 126) 		2068 Nov 09
(Saros 127)
2079 Oct 10
(Saros 128) 		2090 Sep 08
(Saros 129) 		2101 Aug 09
(Saros 130) 		2112 Jul 09
(Saros 131) 		2123 Jun 09
(Saros 132)
2134 May 08
(Saros 133) 		2145 Apr 07
(Saros 134) 		2156 Mar 07
(Saros 135) 		2167 Feb 04
(Saros 136) 		2178 Jan 04
(Saros 137)
2188 Dec 04
(Saros 138) 		2199 Nov 02
(Saros 139)

Half-Saros cycle

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 annular solar eclipses of Solar Saros 125.

August 11, 1961 August 22, 1979

See also

Notes

  1. ^ "August 16–17, 1970 Partial Lunar Eclipse". timeanddate. Retrieved 3 January 2025.
  2. ^ "Moon Distances for London, United Kingdom, England". timeanddate. Retrieved 3 January 2025.
  3. ^ "Partial Lunar Eclipse of 1970 Aug 17" (PDF). NASA. Retrieved 3 January 2025.
  4. ^ "Partial Lunar Eclipse of 1970 Aug 17". EclipseWise.com. Retrieved 3 January 2025.
  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 118". eclipse.gsfc.nasa.gov.
  7. ^ Listing of Eclipses of series 118
  8. ^ Mathematical Astronomy Morsels, Jean Meeus, p.110, Chapter 18, The half-saros


Quelle: https://en.wikipedia.org/wiki/August_1970_lunar_eclipse