Solar eclipse of April 29, 1976

Last updated
Solar eclipse of April 29, 1976
SE1976Apr29A.png
Map
Type of eclipse
NatureAnnular
Gamma 0.3378
Magnitude 0.9421
Maximum eclipse
Duration401 s (6 min 41 s)
Coordinates 34°00′N18°18′E / 34°N 18.3°E / 34; 18.3
Max. width of band227 km (141 mi)
Times (UTC)
Greatest eclipse10:24:18
References
Saros 128 (56 of 73)
Catalog # (SE5000) 9456

An annular solar eclipse occurred at the Moon's descending node of orbit on Thursday, April 29, 1976, with a magnitude of 0.9421. 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. An annular solar eclipse occurs when the Moon's apparent diameter is smaller than the Sun's, blocking most of the Sun's light and causing the Sun to look like an annulus (ring). An annular eclipse appears as a partial eclipse over a region of the Earth thousands of kilometres wide. Annularity was visible from North Africa, Greece, Turkey, Middle East, central Asia, India, China. 5 of the 14 eight-thousanders in Pakistan and China—Nanga Parbat, K2, Broad Peak, Gasherbrum II and Gasherbrum I, lie in the path of annularity.

Contents

Observation

The Institute of Physics and Institute of Mathematics of the Chinese Academy of Sciences and the Xinjiang Earthquake Team conducted observations of gravitational effects using gravimeters, inclinometers, pendulum clocks and seismometers in southwestern Hotan County, Hotan Prefecture, Xinjiang near the Karakoram Pass at an altitude of 5,500 metres (18,000 ft). Results showed that the gravitational acceleration had no obvious effect within the accuracy of the instruments. No inclination was recorded on the photosensitive paper of the inclinometer due to the width of its lines. Three inclinations were pen-recorded, whose time and direction were clearly related to that of the eclipse. Due to the difficult conditions with the high altitude, the observation team was unable to obtain more comparative data. [1]

Eclipses in 1976

Metonic

Tzolkinex

Half-Saros

Tritos

Solar Saros 128

Inex

Triad

Solar eclipses of 1975–1978

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. [2]

Solar eclipse series sets from 1975 to 1978
Descending node Ascending node
SarosMapGammaSarosMapGamma
118 May 11, 1975
SE1975May11P.png
Partial
1.0647123 November 3, 1975
SE1975Nov03P.png
Partial
−1.0248
128 April 29, 1976
SE1976Apr29A.png
Annular
0.3378133 October 23, 1976
SE1976Oct23T.png
Total
−0.327
138 April 18, 1977
SE1977Apr18A.png
Annular
−0.399143 October 12, 1977
SE1977Oct12T.png
Total
0.3836
148 April 7, 1978
SE1978Apr07P.png
Partial
−1.1081153 October 2, 1978
SE1978Oct02P.png
Partial
1.1616

Saros 128

This eclipse is a part of Saros series 128, repeating every 18 years, 11 days, and containing 73 events. The series started with a partial solar eclipse on August 29, 984 AD. It contains total eclipses from May 16, 1417 through June 18, 1471; hybrid eclipses from June 28, 1489 through July 31, 1543; and annular eclipses from August 11, 1561 through July 25, 2120. The series ends at member 73 as a partial eclipse on November 1, 2282. 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 27 at 1 minutes, 45 seconds on June 7, 1453, and the longest duration of annularity was produced by member 48 at 8 minutes, 35 seconds on February 1, 1832. All eclipses in this series occur at the Moon’s descending node of orbit. [3]

Series members 47–68 occur between 1801 and 2200:
474849
SE1814Jan21A.gif
January 21, 1814
SE1832Feb01A.gif
February 1, 1832
SE1850Feb12A.gif
February 12, 1850
505152
SE1868Feb23A.gif
February 23, 1868
SE1886Mar05A.gif
March 5, 1886
SE1904Mar17A.png
March 17, 1904
535455
SE1922Mar28A.png
March 28, 1922
SE1940Apr07A.png
April 7, 1940
SE1958Apr19A.png
April 19, 1958
565758
SE1976Apr29A.png
April 29, 1976
SE1994May10A.png
May 10, 1994
SE2012May20A.png
May 20, 2012
596061
SE2030Jun01A.png
June 1, 2030
SE2048Jun11A.png
June 11, 2048
SE2066Jun22A.png
June 22, 2066
626364
SE2084Jul03A.png
July 3, 2084
SE2102Jul15A.png
July 15, 2102
SE2120Jul25A.png
July 25, 2120
656667
Saros128 65van73 SE2138Aug05P.jpg
August 5, 2138
Saros128 66van73 SE2156Aug16P.jpg
August 16, 2156
Saros128 67van73 SE2174Aug27P.jpg
August 27, 2174
68
Saros128 68van73 SE2192Sep06P.jpg
September 6, 2192

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
SE1801Sep08P.png
September 8, 1801
(Saros 112)
SE1812Aug07P.gif
August 7, 1812
(Saros 113)
SE1823Jul08P.gif
July 8, 1823
(Saros 114)
SE1834Jun07P.gif
June 7, 1834
(Saros 115)
SE1845May06An.gif
May 6, 1845
(Saros 116)
SE1856Apr05T.gif
April 5, 1856
(Saros 117)
SE1867Mar06A.gif
March 6, 1867
(Saros 118)
SE1878Feb02A.gif
February 2, 1878
(Saros 119)
SE1889Jan01T.png
January 1, 1889
(Saros 120)
SE1899Dec03A.png
December 3, 1899
(Saros 121)
SE1910Nov02P.png
November 2, 1910
(Saros 122)
SE1921Oct01T.png
October 1, 1921
(Saros 123)
SE1932Aug31T.png
August 31, 1932
(Saros 124)
SE1943Aug01A.png
August 1, 1943
(Saros 125)
SE1954Jun30T.png
June 30, 1954
(Saros 126)
SE1965May30T.png
May 30, 1965
(Saros 127)
SE1976Apr29A.png
April 29, 1976
(Saros 128)
SE1987Mar29H.png
March 29, 1987
(Saros 129)
SE1998Feb26T.png
February 26, 1998
(Saros 130)
SE2009Jan26A.png
January 26, 2009
(Saros 131)
SE2019Dec26A.png
December 26, 2019
(Saros 132)
SE2030Nov25T.png
November 25, 2030
(Saros 133)
SE2041Oct25A.png
October 25, 2041
(Saros 134)
SE2052Sep22A.png
September 22, 2052
(Saros 135)
SE2063Aug24T.png
August 24, 2063
(Saros 136)
SE2074Jul24A.png
July 24, 2074
(Saros 137)
SE2085Jun22A.png
June 22, 2085
(Saros 138)
SE2096May22T.png
May 22, 2096
(Saros 139)
SE2107Apr23A.png
April 23, 2107
(Saros 140)
SE2118Mar22A.png
March 22, 2118
(Saros 141)
SE2129Feb18T.png
February 18, 2129
(Saros 142)
SE2140Jan20A.png
January 20, 2140
(Saros 143)
SE2150Dec19A.png
December 19, 2150
(Saros 144)
SE2161Nov17T.png
November 17, 2161
(Saros 145)
SE2172Oct17H.png
October 17, 2172
(Saros 146)
Saros147 32van80 SE2183Sep16A.jpg
September 16, 2183
(Saros 147)
Saros148 31van75 SE2194Aug16T.jpg
August 16, 2194
(Saros 148)

Metonic series

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 11, 1953 and July 11, 2029
July 10–11April 29–30February 15–16December 4September 21–23
116118120122124
SE1953Jul11P.png
July 11, 1953
SE1957Apr30A.png
April 30, 1957
SE1961Feb15T.png
February 15, 1961
SE1964Dec04P.png
December 4, 1964
SE1968Sep22T.png
September 22, 1968
126128130132134
SE1972Jul10T.png
July 10, 1972
SE1976Apr29A.png
April 29, 1976
SE1980Feb16T.png
February 16, 1980
SE1983Dec04A.png
December 4, 1983
SE1987Sep23A.png
September 23, 1987
136138140142144
SE1991Jul11T.png
July 11, 1991
SE1995Apr29A.png
April 29, 1995
SE1999Feb16A.png
February 16, 1999
SE2002Dec04T.png
December 4, 2002
SE2006Sep22A.png
September 22, 2006
146148150152154
SE2010Jul11T.png
July 11, 2010
SE2014Apr29A.png
April 29, 2014
SE2018Feb15P.png
February 15, 2018
SE2021Dec04T.png
December 4, 2021
SE2025Sep21P.png
September 21, 2025
156
SE2029Jul11P.png
July 11, 2029

Notes

  1. 王榴泉 田景发 刘煜奋 汤小琳 赵之淑 秦荣先 谭大均 刘易成 张建朝 (1978). "1976年4月29日日环食时引力效应观测——重力仪与倾斜仪的观测结果". 科学通报 (8): 477–480.
  2. 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.
  3. "NASA - Catalog of Solar Eclipses of Saros 128". eclipse.gsfc.nasa.gov.

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References