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Solar eclipse of July 31, 1981

Total eclipse

Summary

Total eclipse

FieldValue
previousSolar eclipse of February 4, 1981
nextSolar eclipse of January 25, 1982

A total solar eclipse occurred at the Moon's ascending node of orbit on Friday, July 31, 1981, with a magnitude of 1.0258. 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 about 3.7 days after perigee (on July 27, 1981, at 10:20 UTC), the Moon's apparent diameter was larger.

The moon's apparent diameter was 7 arcseconds larger than the February 4, 1981 annular solar eclipse.

The continental path of totality fell entirely within the Soviet Union, belonging to Georgia, Kazakhstan and Russia today. The southern part of Mount Elbrus, the highest mountain in Europe, also lay in the path of totality. A partial eclipse was visible for parts of Northern Europe, Asia, Alaska, western Canada, and Greenland. The eclipse was mostly seen on July 31, 1981, except for Alaska, northwestern Canada and Northwestern Hawaiian Islands, where a partial eclipse was seen on July 30 local time, and northern Greenland, where a partial eclipse started on July 30, passing midnight and ended on July 31 due to the midnight sun.

Observations

Scientists from the High Altitude Observatory of National Center for Atmospheric Research, E. O. Hulburt Center for Space Research of the United States Naval Research Laboratory and the Academy of Sciences of the Soviet Union made studies to the high altitudes of corona during the eclipse. A joint U.S.-Soviet observation team went to Bratsk, Irkutsk Oblast, Soviet Union. Scientists studied the three-dimensional structure of the corona based on coronagraph observations, images of the corona taken in Bratsk, and observations made from Solwind / P78-1 satellite.

Eclipse details

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.

EventTime (UTC)
First Penumbral External Contact1981 July 31 at 01:12:08.0 UTC
First Umbral External Contact1981 July 31 at 02:18:14.0 UTC
First Central Line1981 July 31 at 02:18:40.7 UTC
First Umbral Internal Contact1981 July 31 at 02:19:07.5 UTC
Equatorial Conjunction1981 July 31 at 03:36:25.8 UTC
Greatest Duration1981 July 31 at 03:43:31.6 UTC
Greatest Eclipse1981 July 31 at 03:46:36.6 UTC
Ecliptic Conjunction1981 July 31 at 03:52:48.9 UTC
Last Umbral Internal Contact1981 July 31 at 05:14:16.1 UTC
Last Central Line1981 July 31 at 05:14:40.1 UTC
Last Umbral External Contact1981 July 31 at 05:15:04.1 UTC
Last Penumbral External Contact1981 July 31 at 06:21:15.5 UTC
ParameterValue
Eclipse Magnitude1.02584
Eclipse Obscuration1.05235
Gamma0.57917
Sun Right Ascension08h41m03.3s
Sun Declination+18°18'24.9"
Sun Semi-Diameter15'45.4"
Sun Equatorial Horizontal Parallax08.7"
Moon Right Ascension08h41m26.2s
Moon Declination+18°51'47.8"
Moon Semi-Diameter15'57.1"
Moon Equatorial Horizontal Parallax0°58'32.6"
ΔT51.8 s

Eclipse season

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.

July 17
Descending node (full moon)
July 31
Ascending node (new moon)
[[File:Lunar eclipse chart close-1981Jul17.png200px]][[File:SE1981Jul31T.png200px]]
Partial lunar eclipse
Lunar Saros 119Total solar eclipse
Solar Saros 145

References

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References

  1. "July 31, 1981 Total Solar Eclipse". timeanddate.
  2. "Moon Distances for London, United Kingdom, England". timeanddate.
  3. R. R. Fisher, L. B. Lacey, K. A. Rock, E. A. Yasukawa, N. R. Sheeley Jr., D. J. Michels, R. A. Howard, M. J. Koomen, A. Bagrov. (March 1983). "The Solar Corona on 31 July, 1981". Solar Physics.
  4. "Total Solar Eclipse of 1981 Jul 31". EclipseWise.com.
Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

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