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July 1973 lunar eclipse

July 1973 lunar eclipse
Penumbral eclipse
The Moon's hourly motion shown right to left
DateJuly 15, 1973
Gamma1.5178
Magnitude−0.9581
Saros cycle148 (1 of 71)
Penumbral99 minutes, 5 seconds
Contacts (UTC)
P110:49:07
Greatest11:38:35
P412:28:12

A penumbral lunar eclipse occurred at the Moon’s ascending node of orbit on Sunday, July 15, 1973,[1] with an umbral magnitude of −0.9581. A lunar eclipse occurs when the Moon moves into the Earth's shadow, causing the Moon to be darkened. A penumbral lunar eclipse occurs when part or all of the Moon's near side passes into 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. Occurring about 3 days after apogee (on July 12, 1973, at 22:45 UTC), the Moon's apparent diameter was smaller.[2]

This eclipse was the third of four lunar eclipses in 1973, with the others occurring on January 18 (penumbral), June 15 (penumbral), and December 10 (partial).

This was the first lunar eclipse of Saros series 148.

Visibility

The eclipse was completely visible over Australia, western North America, and Antarctica, seen rising over east Asia and setting over central North America and western South America.[3]

Eclipse details

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

July 15, 1973 Lunar Eclipse Parameters
Parameter Value
Penumbral Magnitude 0.10468
Umbral Magnitude −0.95805
Gamma 1.51782
Sun Right Ascension 07h38m36.3s
Sun Declination +21°30'35.7"
Sun Semi-Diameter 15'44.1"
Sun Equatorial Horizontal Parallax 08.7"
Moon Right Ascension 19h37m04.9s
Moon Declination -20°10'55.9"
Moon Semi-Diameter 14'48.4"
Moon Equatorial Horizontal Parallax 0°54'20.5"
ΔT 43.9 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. The first and last eclipse in this sequence is separated by one synodic month.

Eclipse season of June–July 1973
June 15
Ascending node (full moon)
June 30
Descending node (new moon)
July 15
Ascending node (full moon)
Penumbral lunar eclipse
Lunar Saros 110
Total solar eclipse
Solar Saros 136
Penumbral lunar eclipse
Lunar Saros 148

Eclipses in 1973

Metonic

Tzolkinex

Half-Saros

Tritos

Lunar Saros 148

Inex

Triad

Lunar eclipses of 1969–1973

This eclipse is a member of a semester series. An eclipse in a semester series of lunar eclipses repeats approximately every 177 days and 4 hours (a semester) at alternating nodes of the Moon's orbit.[5]

The penumbral lunar eclipses on April 2, 1969 and September 25, 1969 occur in the previous lunar year eclipse set, and the lunar eclipses on June 15, 1973 (penumbral) and December 10, 1973 (partial) occur in the next lunar year eclipse set.

Lunar eclipse series sets from 1969 to 1973
Ascending node   Descending node
Saros Date
Viewing
Type
Chart
Gamma Saros Date
Viewing
Type
Chart
Gamma
108 1969 Aug 27
Penumbral
−1.5407 113 1970 Feb 21
Partial
0.9620
118 1970 Aug 17
Partial
−0.8053 123 1971 Feb 10
Total
0.2741
128 1971 Aug 06
Total
−0.0794 133 1972 Jan 30
Total
−0.4273
138 1972 Jul 26
Partial
0.7117 143 1973 Jan 18
Penumbral
−1.0845
148 1973 Jul 15
Penumbral
1.5178

Half-Saros cycle

A lunar eclipse will be preceded and followed by solar eclipses by 9 years and 5.5 days (a half saros).[6] This lunar eclipse is related to two partial solar eclipses of Solar Saros 155.

July 9, 1964 July 20, 1982

See also

Notes

  1. ^ "July 15, 1973 Penumbral Lunar Eclipse". timeanddate. Retrieved 3 January 2025.
  2. ^ "Moon Distances for London, United Kingdom, England". timeanddate. Retrieved 3 January 2025.
  3. ^ "Penumbral Lunar Eclipse of 1973 Jul 15" (PDF). NASA. Retrieved 3 January 2025.
  4. ^ "Penumbral Lunar Eclipse of 1973 Jul 15". EclipseWise.com. Retrieved 3 January 2025.
  5. ^ 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.
  6. ^ Mathematical Astronomy Morsels, Jean Meeus, p.110, Chapter 18, The half-saros


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