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July 1936 lunar eclipse

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July 1936 lunar eclipse
Partial eclipse
The Moon's hourly motion shown right to left
DateJuly 4, 1936
Gamma0.8642
Magnitude0.2668
Saros cycle138 (25 of 83)
Partiality116 minutes, 18 seconds
Penumbral289 minutes, 31 seconds
Contacts (UTC)
P115:00:16
U116:26:56
Greatest17:25:00
U418:23:14
P419:49:46

A partial lunar eclipse occurred at the Moon’s ascending node of orbit on Saturday, July 4, 1936,[1] with an umbral magnitude of 0.2668. A lunar eclipse occurs when the Moon moves into the Earth's shadow, causing the Moon to be darkened. A partial lunar eclipse occurs when one part of the Moon is in the Earth's umbra, while the other part is in the Earth's penumbra. Unlike a solar eclipse, which can only be viewed from a relatively small area of the world, a lunar eclipse may be viewed from anywhere on the night side of Earth. The Moon's apparent diameter was near the average diameter because it occurred 6.8 days after apogee (on June 27, 1936, at 21:30 UTC) and 7.2 days before perigee (on July 11, 1936, at 22:05 UTC).[2]

Visibility

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The eclipse was completely visible over south and east Asia, Australia, and Antarctica, seen rising over Africa, Europe, and west and central Asia and setting over northeast Asia and the central Pacific Ocean.[3]

Eclipse details

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Shown below is a table displaying details about this particular solar eclipse. It describes various parameters pertaining to this eclipse.[4]

July 4, 1936 Lunar Eclipse Parameters
Parameter Value
Penumbral Magnitude 1.27781
Umbral Magnitude 0.26679
Gamma 0.86423
Sun Right Ascension 06h54m24.6s
Sun Declination +22°51'29.8"
Sun Semi-Diameter 15'43.8"
Sun Equatorial Horizontal Parallax 08.6"
Moon Right Ascension 18h53m44.0s
Moon Declination -22°03'02.9"
Moon Semi-Diameter 15'33.6"
Moon Equatorial Horizontal Parallax 0°57'06.2"
ΔT 23.8 s

Eclipse season

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See also: Eclipse cycle

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 June–July 1936
June 19
Descending node (new moon)		 July 4
Ascending node (full moon)
Total solar eclipse
Solar Saros 126		 Partial lunar eclipse
Lunar Saros 138
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Eclipses in 1936

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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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Lunar Saros 138

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Inex

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Triad

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Lunar eclipses of 1933–1936

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Lunar eclipse series sets from 1933–1936
Descending node   Ascending node
Saros Date
Viewing 		Type
Chart 		Saros Date
Viewing 		Type
Chart
103 1933 Feb 10
 Penumbral
 108 1933 Aug 05
 Penumbral
113 1934 Jan 30
 Partial
 118 1934 Jul 26
 Partial
123 1935 Jan 19
 Total
 128 1935 Jul 16
 Total
133 1936 Jan 08
 Total
 138 1936 Jul 04
 Partial
143 1936 Dec 28
 Penumbral

Half-Saros cycle

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A lunar eclipse will be preceded and followed by solar eclipses by 9 years and 5.5 days (a half saros).[5] This lunar eclipse is related to two total solar eclipses of Solar Saros 145.

June 29, 1927 July 9, 1945

See also

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Notes

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  1. ^ "July 4–5, 1936 Partial Lunar Eclipse". timeanddate. Retrieved 17 December 2024.
  2. ^ "Moon Distances for London, United Kingdom, England". timeanddate. Retrieved 17 December 2024.
  3. ^ "Partial Lunar Eclipse of 1936 Jul 04" (PDF). NASA. Retrieved 17 December 2024.
  4. ^ "Partial Lunar Eclipse of 1936 Jul 04". EclipseWise.com. Retrieved 17 December 2024.
  5. ^ Mathematical Astronomy Morsels, Jean Meeus, p.110, Chapter 18, The half-saros
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