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Solar eclipse of February 25, 1971

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Solar eclipse of February 25, 1971
Map
Type of eclipse
NaturePartial
Gamma1.1188
Magnitude0.7872
Maximum eclipse
Coordinates61°24′N 33°30′W / 61.4°N 33.5°W / 61.4; -33.5
Times (UTC)
Greatest eclipse9:38:07
References
Saros149 (18 of 71)
Catalog # (SE5000)9444

A partial solar eclipse occurred at the Moon's ascending node of orbit on Thursday, February 25, 1971,[1] with a magnitude of 0.7872. 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 and Europe.

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]

February 25, 1971 Solar Eclipse Times
Event Time (UTC)
First Penumbral External Contact 1971 February 25 at 07:49:28.7 UTC
Greatest Eclipse 1971 February 25 at 09:38:07.1 UTC
Ecliptic Conjunction 1971 February 25 at 09:49:14.7 UTC
Equatorial Conjunction 1971 February 25 at 10:37:14.9 UTC
Last Penumbral External Contact 1971 February 25 at 11:26:20.3 UTC
February 25, 1971 Solar Eclipse Parameters
Parameter Value
Eclipse Magnitude 0.78718
Eclipse Obscuration 0.73865
Gamma 1.11876
Sun Right Ascension 22h31m38.2s
Sun Declination -09°15'46.7"
Sun Semi-Diameter 16'09.4"
Sun Equatorial Horizontal Parallax 08.9"
Moon Right Ascension 22h29m32.0s
Moon Declination -08°14'50.7"
Moon Semi-Diameter 16'42.7"
Moon Equatorial Horizontal Parallax 1°01'19.9"
ΔT 41.3 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 February 1971
February 10
Descending node (full moon)
February 25
Ascending node (new moon)
Total lunar eclipse
Lunar Saros 123
Partial solar eclipse
Solar Saros 149
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Eclipses in 1971

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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 149

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Inex

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Triad

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Solar eclipses of 1968–1971

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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 eclipse on July 22, 1971 occurs in the next lunar year eclipse set.

Solar eclipse series sets from 1968 to 1971
Ascending node   Descending node
Saros Map Gamma Saros Map Gamma
119 March 28, 1968

Partial
−1.037 124 September 22, 1968

Total
0.9451
129 March 18, 1969

Annular
−0.2704 134 September 11, 1969

Annular
0.2201
139

Totality in Williamston, NC
USA
March 7, 1970

Total
0.4473 144 August 31, 1970

Annular
−0.5364
149 February 25, 1971

Partial
1.1188 154 August 20, 1971

Partial
−1.2659

Saros 149

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This eclipse is a part of Saros series 149, repeating every 18 years, 11 days, and containing 71 events. The series started with a partial solar eclipse on August 21, 1664. It contains total eclipses from April 9, 2043 through October 2, 2331; hybrid eclipses from October 13, 2349 through November 3, 2385; and annular eclipses from November 15, 2403 through July 13, 2800. The series ends at member 71 as a partial eclipse on September 28, 2926. 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 31 at 4 minutes, 10 seconds on July 17, 2205, and the longest duration of annularity will be produced by member 62 at 5 minutes, 6 seconds on June 21, 2764. All eclipses in this series occur at the Moon’s ascending node of orbit.[4]

Series members 9–30 occur between 1801 and 2200:
9 10 11

November 18, 1808

November 29, 1826

December 9, 1844
12 13 14

December 21, 1862

December 31, 1880

January 11, 1899
15 16 17

January 23, 1917

February 3, 1935

February 14, 1953
18 19 20

February 25, 1971

March 7, 1989

March 19, 2007
21 22 23

March 29, 2025

April 9, 2043

April 20, 2061
24 25 26

May 1, 2079

May 11, 2097

May 24, 2115
27 28 29

June 3, 2133

June 14, 2151

June 25, 2169
30

July 6, 2187

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 ascending node.

22 eclipse events between December 13, 1898 and July 20, 1982
December 13–14 October 1–2 July 20–21 May 9 February 24–25
111 113 115 117 119

December 13, 1898

July 21, 1906

May 9, 1910

February 25, 1914
121 123 125 127 129

December 14, 1917

October 1, 1921

July 20, 1925

May 9, 1929

February 24, 1933
131 133 135 137 139

December 13, 1936

October 1, 1940

July 20, 1944

May 9, 1948

February 25, 1952
141 143 145 147 149

December 14, 1955

October 2, 1959

July 20, 1963

May 9, 1967

February 25, 1971
151 153 155

December 13, 1974

October 2, 1978

July 20, 1982

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.

The partial solar eclipses on November 16, 2134 (part of Saros 164) and October 16, 2145 (part of Saros 165) are also a part of this series but are not included in the table below.

Series members between 1801 and 2069

June 6, 1807
(Saros 134)

May 5, 1818
(Saros 135)

April 3, 1829
(Saros 136)

March 4, 1840
(Saros 137)

February 1, 1851
(Saros 138)

December 31, 1861
(Saros 139)

November 30, 1872
(Saros 140)

October 30, 1883
(Saros 141)

September 29, 1894
(Saros 142)

August 30, 1905
(Saros 143)

July 30, 1916
(Saros 144)

June 29, 1927
(Saros 145)

May 29, 1938
(Saros 146)

April 28, 1949
(Saros 147)

March 27, 1960
(Saros 148)

February 25, 1971
(Saros 149)

January 25, 1982
(Saros 150)

December 24, 1992
(Saros 151)

November 23, 2003
(Saros 152)

October 23, 2014
(Saros 153)

September 21, 2025
(Saros 154)

August 21, 2036
(Saros 155)

July 22, 2047
(Saros 156)

June 21, 2058
(Saros 157)

May 20, 2069
(Saros 158)

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

June 5, 1826
(Saros 144)

May 16, 1855
(Saros 145)

April 25, 1884
(Saros 146)

April 6, 1913
(Saros 147)

March 16, 1942
(Saros 148)

February 25, 1971
(Saros 149)

February 5, 2000
(Saros 150)

January 14, 2029
(Saros 151)

December 26, 2057
(Saros 152)

December 6, 2086
(Saros 153)

November 16, 2115
(Saros 154)

October 26, 2144
(Saros 155)

October 7, 2173
(Saros 156)

References

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  1. ^ "February 25, 1971 Partial Solar Eclipse". timeanddate. Retrieved 8 August 2024.
  2. ^ "Partial Solar Eclipse of 1971 Feb 25". 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 149". eclipse.gsfc.nasa.gov.
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