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Solar eclipse of May 11, 1975

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Solar eclipse of May 11, 1975
Map
Type of eclipse
NaturePartial
Gamma1.0647
Magnitude0.8636
Maximum eclipse
Coordinates69°42′N 80°12′W / 69.7°N 80.2°W / 69.7; -80.2
Times (UTC)
Greatest eclipse7:17:33
References
Saros118 (66 of 72)
Catalog # (SE5000)9454

A partial solar eclipse occurred at the Moon's descending node of orbit on Sunday, May 11, 1975,[1] with a magnitude of 0.8636. 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.

A partial eclipse was visible for parts of North Africa, Europe, North Asia, Greenland, and northern Canada.

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]

May 11, 1975 Solar Eclipse Times
Event Time (UTC)
First Penumbral External Contact 1975 May 11 at 05:09:12.6 UTC
Ecliptic Conjunction 1975 May 11 at 07:05:38.4 UTC
Greatest Eclipse 1975 May 11 at 07:17:33.1 UTC
Equatorial Conjunction 1975 May 11 at 07:38:39.4 UTC
Last Penumbral External Contact 1975 May 11 at 09:25:38.4 UTC
May 11, 1975 Solar Eclipse Parameters
Parameter Value
Eclipse Magnitude 0.86361
Eclipse Obscuration 0.81627
Gamma 1.06472
Sun Right Ascension 03h10m11.2s
Sun Declination +17°44'25.7"
Sun Semi-Diameter 15'50.1"
Sun Equatorial Horizontal Parallax 08.7"
Moon Right Ascension 03h09m27.7s
Moon Declination +18°43'13.9"
Moon Semi-Diameter 15'19.1"
Moon Equatorial Horizontal Parallax 0°56'13.2"
ΔT 45.8 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 May 1975
May 11
Descending node (new moon)
May 25
Ascending node (full moon)
Partial solar eclipse
Solar Saros 118
Total lunar eclipse
Lunar Saros 130
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Eclipses in 1975

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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 118

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Inex

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Triad

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Solar eclipses of 1975–1978

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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]

Solar eclipse series sets from 1975 to 1978
Descending node   Ascending node
Saros Map Gamma Saros Map Gamma
118 May 11, 1975

Partial
1.0647 123 November 3, 1975

Partial
−1.0248
128 April 29, 1976

Annular
0.3378 133 October 23, 1976

Total
−0.327
138 April 18, 1977

Annular
−0.399 143 October 12, 1977

Total
0.3836
148 April 7, 1978

Partial
−1.1081 153 October 2, 1978

Partial
1.1616

Saros 118

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This eclipse is a part of Saros series 118, repeating every 18 years, 11 days, and containing 72 events. The series started with a partial solar eclipse on May 24, 803 AD. It contains total eclipses from August 19, 947 AD through October 25, 1650; hybrid eclipses on November 4, 1668 and November 15, 1686; and annular eclipses from November 27, 1704 through April 30, 1957. The series ends at member 72 as a partial eclipse on July 15, 2083. 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 34 at 6 minutes, 59 seconds on May 16, 1398, and the longest duration of annularity was produced by member 59 at 1 minutes, 58 seconds on February 23, 1849. All eclipses in this series occur at the Moon’s descending node of orbit.[4]

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 22, 1971 and July 22, 2047
July 22 May 9–11 February 26–27 December 14–15 October 2–3
116 118 120 122 124

July 22, 1971

May 11, 1975

February 26, 1979

December 15, 1982

October 3, 1986
126 128 130 132 134

July 22, 1990

May 10, 1994

February 26, 1998

December 14, 2001

October 3, 2005
136 138 140 142 144

July 22, 2009

May 10, 2013

February 26, 2017

December 14, 2020

October 2, 2024
146 148 150 152 154

July 22, 2028

May 9, 2032

February 27, 2036

December 15, 2039

October 3, 2043
156

July 22, 2047

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 1866 and 2200

March 16, 1866
(Saros 108)

December 13, 1898
(Saros 111)

September 12, 1931
(Saros 114)

August 12, 1942
(Saros 115)

July 11, 1953
(Saros 116)

June 10, 1964
(Saros 117)

May 11, 1975
(Saros 118)

April 9, 1986
(Saros 119)

March 9, 1997
(Saros 120)

February 7, 2008
(Saros 121)

January 6, 2019
(Saros 122)

December 5, 2029
(Saros 123)

November 4, 2040
(Saros 124)

October 4, 2051
(Saros 125)

September 3, 2062
(Saros 126)

August 3, 2073
(Saros 127)

July 3, 2084
(Saros 128)

June 2, 2095
(Saros 129)

May 3, 2106
(Saros 130)

April 2, 2117
(Saros 131)

March 1, 2128
(Saros 132)

January 30, 2139
(Saros 133)

December 30, 2149
(Saros 134)

November 27, 2160
(Saros 135)

October 29, 2171
(Saros 136)

September 27, 2182
(Saros 137)

August 26, 2193
(Saros 138)

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

September 8, 1801
(Saros 112)

August 18, 1830
(Saros 113)

July 29, 1859
(Saros 114)

July 9, 1888
(Saros 115)

June 19, 1917
(Saros 116)

May 30, 1946
(Saros 117)

May 11, 1975
(Saros 118)

April 19, 2004
(Saros 119)

March 30, 2033
(Saros 120)

March 11, 2062
(Saros 121)

February 18, 2091
(Saros 122)

January 30, 2120
(Saros 123)

January 9, 2149
(Saros 124)

December 20, 2177
(Saros 125)

References

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  1. ^ "May 11, 1975 Partial Solar Eclipse". timeanddate. Retrieved 8 August 2024.
  2. ^ "Partial Solar Eclipse of 1975 May 11". EclipseWise.com. Retrieved 8 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 118". eclipse.gsfc.nasa.gov.
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