June 1983 lunar eclipse

{{Infobox lunar eclipse

| type = partial

| image = Lunar eclipse chart close-1983Jun25.png

| caption = The Moon's hourly motion shown right to left

| date = June 25, 1983

| gamma = −0.8152

| magnitude = 0.3348

| saros_ser = 139

| saros_no = 20 of 81

| partiality = 134 minutes, 35 seconds

| penumbral = 314 minutes, 43 seconds

| p1 = 5:44:56

| u1 = 7:14:57

| greatest = 8:22:18

| u4 = 9:29:32

| p4 = 10:59:39

| previous = December 1982

| next = December 1983

}}

A partial lunar eclipse occurred at the Moon’s descending node of orbit on Saturday, June 25, 1983,{{cite web|title=June 24–25, 1983 Partial Lunar Eclipse|url=https://www.timeanddate.com/eclipse/lunar/1983-june-25|publisher=timeanddate|access-date=6 January 2025}} with an umbral magnitude of 0.3348. 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. Occurring about 3.7 days before apogee (on June 28, 1983, at 23:40 UTC), the Moon's apparent diameter was smaller.{{cite web|title=Moon Distances for London, United Kingdom, England|url=https://www.timeanddate.com/astronomy/moon/distance.html?year=1983&n=136|publisher=timeanddate|access-date=6 January 2025}}

Visibility

The eclipse was completely visible over western and central North America, western South America, and Antarctica, seen rising over Australia and the western Pacific Ocean and setting over eastern North and South America and west Africa.{{cite web|title=Partial Lunar Eclipse of 1983 Jun 25|url=https://eclipse.gsfc.nasa.gov/LEplot/LEplot1951/LE1983Jun25P.pdf|publisher=NASA|access-date=6 January 2025}}

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Eclipse details

Shown below is a table displaying details about this particular lunar eclipse. It describes various parameters pertaining to this eclipse.{{cite web|title=Partial Lunar Eclipse of 1983 Jun 25|url=https://eclipsewise.com/lunar/LEprime/1901-2000/LE1983Jun25Pprime.html|publisher=EclipseWise.com|access-date=6 January 2025}}

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|+June 25, 1983 Lunar Eclipse Parameters

! Parameter

! Value

Penumbral Magnitude

| 1.39014

Umbral Magnitude

| 0.33479

Gamma

| −0.81520

Sun Right Ascension

| 06h14m04.1s

Sun Declination

| +23°24'07.7"

Sun Semi-Diameter

| 15'44.1"

Sun Equatorial Horizontal Parallax

| 08.7"

Moon Right Ascension

| 18h13m49.6s

Moon Declination

| -24°08'36.4"

Moon Semi-Diameter

| 14'54.6"

Moon Equatorial Horizontal Parallax

| 0°54'43.1"

ΔT

| 53.4 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.

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|+ Eclipse season of June 1983

! June 11
Ascending node (new moon)

June 25
Descending node (full moon)

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| Total solar eclipse
Solar Saros 127

Partial lunar eclipse
Lunar Saros 139

Related eclipses

= Eclipses in 1983 =

A total solar eclipse on June 11.
A partial lunar eclipse on June 25.
An annular solar eclipse on December 4.
A penumbral lunar eclipse on December 20.

= Metonic =

Preceded by: Lunar eclipse of September 6, 1979
Followed by: Lunar eclipse of April 14, 1987

= Tzolkinex =

Preceded by: Lunar eclipse of May 13, 1976
Followed by: Lunar eclipse of August 6, 1990

= Half-Saros =

Preceded by: Solar eclipse of June 20, 1974
Followed by: Solar eclipse of June 30, 1992

= Tritos =

Preceded by: Lunar eclipse of July 26, 1972
Followed by: Lunar eclipse of May 25, 1994

= Lunar Saros 139 =

Preceded by: Lunar eclipse of June 14, 1965
Followed by: Lunar eclipse of July 5, 2001

= Inex =

Preceded by: Lunar eclipse of July 16, 1954
Followed by: Lunar eclipse of June 4, 2012

= Triad =

Preceded by: Lunar eclipse of August 23, 1896
Followed by: Lunar eclipse of April 25, 2070

= Lunar eclipses of 1980–1984 =

= Saros 139 =

= Tritos series =

= Inex series =

= Half-Saros cycle =

A lunar eclipse will be preceded and followed by solar eclipses by 9 years and 5.5 days (a half saros).Mathematical Astronomy Morsels, Jean Meeus, p.110, Chapter 18, The half-saros This lunar eclipse is related to two total solar eclipses of Solar Saros 146.

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