Solar eclipse of June 11, 1983

A total solar eclipse occurred at the Moon's ascending node of the orbit on June 11, 1983. 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 total solar eclipse occurs when the Moon's apparent diameter is larger than the Sun's, blocking all direct sunlight, turning day into darkness. Totality occurs in a narrow path across Earth's surface, with the partial solar eclipse visible over a surrounding region thousands of kilometres wide. Occurring only 48 hours before perigee (Perigee on June 13, 1983), the Moon's apparent diameter was larger.

Solar eclipse of June 11, 1983
Map
Type of eclipse
NatureTotal
Gamma−0.4947
Magnitude1.0524
Maximum eclipse
Duration311 sec (5 m 11 s)
Coordinates6.2°S 114.2°E / -6.2; 114.2
Max. width of band199 km (124 mi)
Times (UTC)
Greatest eclipse4:43:33
References
Saros127 (56 of 82)
Catalog # (SE5000)9472

The path of totality went through Christmas Islands, Indonesia, Papua New Guinea, and terminated in Vanuatu. Maximum eclipse occurred off the Indonesian island of Madura. Major Indonesian cities witnessed totality, including Yogyakarta, Semarang, Surabaya, and Makassar, in addition to Port Moresby in Papua New Guinea.

Restrictions of observation

To avoid blindness, then president of Indonesia Soeharto prohibited local people from observing the eclipse directly through then Information Minister Harmoko, only allowing foreigners to observe from faraway places. Besides the requirements of closing and draping over all windows and airshafts, children were asked to hide themselves in cupboards and below desks as the eclipsing sun's rays were said to be more dangerous to children than to adults. They were allowed to watch a live broadcast of the eclipse occurring over Borobudur Temple in Magelang, Central Java, on state-owned TV channel TVRI. Because of the difference in restriction's intensity between regions, some locals did observe it.[1]

Observation

The Chinese Eclipse Observation Team formed by Beijing Astronomical Observatory (now incorporated into the National Astronomical Observatories of China), Purple Mountain Observatory and Nanjing Astronomical Instrument Factory conducted observation in Port Moresby. Observation in Port Moresby was successful due to the cloudless weather during the eclipse, compared with the cloudy weather in Yogyakarta where teams from many countries went. The Chinese team did spectrum observations of the chromosphere and corona, the broadband corona luminosity and polarization, and the coloured photography of the whole eclipse process.[2]

Eclipses in 1983

Solar eclipses of 1982–1985

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]

Note: Partial solar eclipses on January 25, 1982 and July 20, 1982 occur in the previous lunar year eclipse set.

Solar eclipse series sets from 1982–1985
Ascending node   Descending node
SarosMapGamma SarosMapGamma
117
1982 June 21
Partial		−1.21017 122
1982 December 15
Partial		1.12928
127
1983 June 11
Total		−0.49475 132
1983 December 4
Annular		0.40150
137
1984 May 30
Annular		0.27552 142

Partial from Gisborne, NZ
1984 November 22
Total		−0.31318
147
1985 May 19
Partial		1.07197 152
1985 November 12
Total		−0.97948

Saros 127

It is a part of Saros cycle 127, repeating every 18 years, 11 days, containing 82 events. The series started with partial solar eclipse on October 10, 991 AD. It contains total eclipses from May 14, 1352 through August 15, 2091. There are no annular eclipses in this series. The series ends at member 82 as a partial eclipse on March 21, 2452. The longest duration of totality was 5 minutes, 40 seconds on August 30, 1532. All eclipses in this series occurs at the Moon’s ascending node.[4]

Series members 52–68 occur between 1901 and 2200
52 53 54

April 28, 1911
May 9, 1929
May 20, 1947
55 56 57

May 30, 1965
June 11, 1983
June 21, 2001
58 59 60

July 2, 2019
July 13, 2037
July 24, 2055
61 62 63

August 3, 2073
August 15, 2091		 August 26, 2109 (Partial)
64 65 66
September 6, 2127 (Partial September 16, 2145 (Partial) September 28, 2163 (Partial)
67 68
October 8, 2181 (Partial) October 19, 2199 (Partial)

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 ascending node.

21 eclipse events, progressing from south to north between June 10, 1964, and August 21, 2036
June 10–11 March 27–29 January 15–16 November 3 August 21–22
117 119 121 123 125

June 10, 1964
March 28, 1968
January 16, 1972
November 3, 1975
August 22, 1979
127 129 131 133 135

June 11, 1983
March 29, 1987
January 15, 1991
November 3, 1994
August 22, 1998
137 139 141 143 145

June 10, 2002
March 29, 2006
January 15, 2010
November 3, 2013
August 21, 2017
147 149 151 153 155

June 10, 2021
March 29, 2025
January 14, 2029
November 3, 2032
August 21, 2036

Inex series

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.

Notes
  1. M Zaid Wahyudi. "Avoiding repeat of bitter memory of 1983 total eclipse". Kompas. Archived from the original on 7 March 2016.
  2. 中国日食观测队天文组 (1983). "1983年6月11日日全食的光学观测". 天文学进展. 1 (2): 246–247.
  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. "Solar Saros series 127". NASA Goddard Space Flight Center. NASA. Retrieved 2 November 2017.

References

Photos:

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