Solar eclipse of April 29, 1976
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| Solar eclipse of April 29, 1976 | |
|---|---|
 Map | |
| Type of eclipse | |
| Nature | Annular |
| Gamma | 0.3378 |
| Magnitude | 0.9421 |
| Maximum eclipse | |
| Duration | 401 s (6 min 41 s) |
| Coordinates | 34°00′N 18°18′E / 34°N 18.3°E |
| Max. width of band | 227 km (141 mi) |
| Times (UTC) | |
| Greatest eclipse | 10:24:18 |
| 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.
Observation[edit]
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]
Related eclipses[edit]
Eclipses in 1976[edit]
- An annular solar eclipse on April 29, 1976.
- A partial lunar eclipse on May 13, 1976.
- A total solar eclipse on October 23, 1976.
- A penumbral lunar eclipse on November 6, 1976.
Metonic[edit]
- Preceded by: Solar eclipse of July 10, 1972
- Followed by: Solar eclipse of February 16, 1980
Tzolkinex[edit]
- Preceded by: Solar eclipse of March 18, 1969
- Followed by: Solar eclipse of June 11, 1983
Half-Saros[edit]
- Preceded by: Lunar eclipse of April 24, 1967
- Followed by: Lunar eclipse of May 4, 1985
Tritos[edit]
- Preceded by: Solar eclipse of May 30, 1965
- Followed by: Solar eclipse of March 29, 1987
Solar Saros 128[edit]
- Preceded by: Solar eclipse of April 19, 1958
- Followed by: Solar eclipse of May 10, 1994
Inex[edit]
- Preceded by: Solar eclipse of May 20, 1947
- Followed by: Solar eclipse of April 8, 2005
Triad[edit]
- Preceded by: Solar eclipse of June 28, 1889
- Followed by: Solar eclipse of February 28, 2063
Solar eclipses of 1975–1978[edit]
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 | |||||
| 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 128[edit]
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: | ||
|---|---|---|
| 47 | 48 | 49 |
 January 21, 1814 |
 February 1, 1832 |
 February 12, 1850 |
| 50 | 51 | 52 |
 February 23, 1868 |
 March 5, 1886 |
 March 17, 1904 |
| 53 | 54 | 55 |
 March 28, 1922 |
 April 7, 1940 |
 April 19, 1958 |
| 56 | 57 | 58 |
April 29, 1976 |
 May 10, 1994 |
 May 20, 2012 |
| 59 | 60 | 61 |
 June 1, 2030 |
 June 11, 2048 |
 June 22, 2066 |
| 62 | 63 | 64 |
 July 3, 2084 |
 July 15, 2102 |
 July 25, 2120 |
| 65 | 66 | 67 |
 August 5, 2138 |
 August 16, 2156 |
 August 27, 2174 |
| 68 | ||
 September 6, 2192 | ||
Metonic series[edit]
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, progressing from north to south between July 11, 1953 and July 11, 2029 | ||||
|---|---|---|---|---|
| July 10–12 | April 29–30 | February 15–16 | December 4–5 | September 21–23 |
| 116 | 118 | 120 | 122 | 124 |
 July 11, 1953 |
 April 30, 1957 |
 February 15, 1961 |
 December 4, 1964 |
 September 22, 1968 |
| 126 | 128 | 130 | 132 | 134 |
 July 10, 1972 |
April 29, 1976 |
 February 16, 1980 |
 December 4, 1983 |
 September 23, 1987 |
| 136 | 138 | 140 | 142 | 144 |
 July 11, 1991 |
 April 29, 1995 |
 February 16, 1999 |
 December 4, 2002 |
 September 22, 2006 |
| 146 | 148 | 150 | 152 | 154 |
 July 11, 2010 |
 April 29, 2014 |
 February 15, 2018 |
 December 4, 2021 |
 September 21, 2025 |
| 156 | 158 | 160 | 162 | 164 |
 July 11, 2029 | ||||
Notes[edit]
- ^ 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.
- ^ 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.
- ^ "NASA - Catalog of Solar Eclipses of Saros 128". eclipse.gsfc.nasa.gov.
References[edit]
- Earth visibility chart and eclipse statistics Eclipse Predictions by Fred Espenak, NASA/GSFC
- Solar eclipse of April 29, 1976 in Russia Archived August 9, 2009, at the Wayback Machine
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