September 1969 lunar eclipse

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September 1969 lunar eclipse
Penumbral eclipse
Lunar eclipse chart close-1969Sep25.png
The Moon's hourly motion shown right to left
DateSeptember 25, 1969
Gamma 1.0656
Magnitude −0.0952
Saros cycle 146 (8 of 72)
Penumbral245 minutes, 9 seconds
Contacts (UTC)
P118:07:03
Greatest20:09:39
P422:12:12

A penumbral lunar eclipse occurred at the Moon’s ascending node of orbit on Thursday, September 25, 1969, [1] with an umbral magnitude of −0.0952. 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 3.4 days after perigee (on September 22, 1969, at 11:45 UTC), the Moon's apparent diameter was larger. [2]

Contents

Visibility

The eclipse was completely visible over Europe, Africa, and Asia, seen rising over eastern South America and west Africa and setting over northeast Asia and Australia. [3]

Lunar eclipse from moon-1969Sep25.png Lunar eclipse chart close-1969Sep25.png

Eclipse details

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

September 25, 1969 Lunar Eclipse Parameters
ParameterValue
Penumbral Magnitude0.90080
Umbral Magnitude−0.09519
Gamma1.06558
Sun Right Ascension12h09m26.5s
Sun Declination-01°01'23.8"
Sun Semi-Diameter15'57.2"
Sun Equatorial Horizontal Parallax08.8"
Moon Right Ascension00h07m25.1s
Moon Declination+01°56'11.3"
Moon Semi-Diameter16'01.1"
Moon Equatorial Horizontal Parallax0°58'47.2"
ΔT39.9 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 August–September 1969
August 27
Ascending node (full moon)
September 11
Descending node (new moon)
September 25
Ascending node (full moon)
Lunar eclipse chart close-1969Aug27.png SE1969Sep11A.png Lunar eclipse chart close-1969Sep25.png
Penumbral lunar eclipse
Lunar Saros 108
Annular solar eclipse
Solar Saros 134
Penumbral lunar eclipse
Lunar Saros 146

Eclipses in 1969

Metonic

Tzolkinex

Half-Saros

Tritos

Lunar Saros 146

Inex

Triad

Lunar eclipses of 1966–1969

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 eclipse on August 27, 1969 occurs in the next lunar year eclipse set.

Lunar eclipse series sets from 1966 to 1969
Descending node Ascending node
Saros Date
Viewing
Type
Chart
Gamma SarosDate
Viewing
Type
Chart
Gamma
111 1966 May 04
Lunar eclipse from moon-1966May04.png
Penumbral
Lunar eclipse chart close-1966May04.png
1.0554116 1966 Oct 29
Lunar eclipse from moon-1966Oct29.png
Penumbral
Lunar eclipse chart close-1966Oct29.png
−1.0600
121 1967 Apr 24
Lunar eclipse from moon-1967Apr24.png
Total
Lunar eclipse chart close-1967Apr24.png
0.2972126 1967 Oct 18
Lunar eclipse from moon-1967Oct18.png
Total
Lunar eclipse chart close-1967Oct18.png
−0.3653
131 1968 Apr 13
Lunar eclipse from moon-1968Apr13.png
Total
Lunar eclipse chart close-1968Apr13.png
−0.4173136 1968 Oct 06
Lunar eclipse from moon-1968Oct06.png
Total
Lunar eclipse chart close-1968Oct06.png
0.3605
141 1969 Apr 02
Lunar eclipse from moon-1969Apr02.png
Penumbral
Lunar eclipse chart close-1969Apr02.png
−1.1765146 1969 Sep 25
Lunar eclipse from moon-1969Sep25.png
Penumbral
Lunar eclipse chart close-1969Sep25.png
1.0656

Saros 146

This eclipse is a part of Saros series 146, repeating every 18 years, 11 days, and containing 72 events. The series started with a penumbral lunar eclipse on July 11, 1843. It contains partial eclipses from October 17, 2005 through May 14, 2348; total eclipses from May 25, 2366 through November 16, 2654; and a second set of partial eclipses from November 27, 2672 through June 12, 2997. The series ends at member 72 as a penumbral eclipse on August 29, 3123.

The longest duration of totality will be produced by member 37 at 99 minutes, 22 seconds on August 8, 2492. All eclipses in this series occur at the Moon’s ascending node of orbit. [6]

GreatestFirst
The greatest eclipse of the series will occur on 2492 Aug 08, lasting 99 minutes, 22 seconds. [7] PenumbralPartialTotalCentral
1843 Jul 11
2005 Oct 17
Lunar eclipse chart close-2005Oct17.png
2366 May 25
2438 Jul 07
Last
CentralTotalPartialPenumbral
2546 Sep 11
2654 Nov 16
2997 Jun 12
3123 Aug 29

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.

Half-Saros cycle

A lunar eclipse will be preceded and followed by solar eclipses by 9 years and 5.5 days (a half saros). [8] This lunar eclipse is related to two partial solar eclipses of Solar Saros 153.

September 20, 1960 October 2, 1978
SE1960Sep20P.png SE1978Oct02P.png

See also

Notes

  1. "September 25–26, 1969 Penumbral Lunar Eclipse". timeanddate. Retrieved 2 January 2025.
  2. "Moon Distances for London, United Kingdom, England". timeanddate. Retrieved 2 January 2025.
  3. "Penumbral Lunar Eclipse of 1969 Sep 25" (PDF). NASA. Retrieved 2 January 2025.
  4. "Penumbral Lunar Eclipse of 1969 Sep 25". EclipseWise.com. Retrieved 2 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. "NASA - Catalog of Lunar Eclipses of Saros 146". eclipse.gsfc.nasa.gov.
  7. Listing of Eclipses of series 146
  8. Mathematical Astronomy Morsels, Jean Meeus, p.110, Chapter 18, The half-saros


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