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Eclipse season: Fix CW Errors with GenFixes (T1)

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{{Short description|Penumbral lunar eclipse December 20, 1983}}
{{Infobox lunar eclipse
| type = penumbral
| image = Lunar eclipse chart close-1983Dec20.png
| caption = The Moon's hourly motion shown right to left
| date = December 20, 1983
| gamma = 1.0747
| magnitude = −0.1167
| saros_ser = 144
| saros_no = 14 of 71
| penumbral = 242 minutes, 15 seconds
| p1 = 23:47:59
| greatest = 1:49:04
| p4 = 3:50:14
| previous = June 1983
| next = May 1984
}}
A penumbral [[lunar eclipse]] occurred at the Moon’s [[Lunar node|ascending node]] of orbit on Tuesday, December 20, 1983,<ref>{{cite web|title=December 19–20, 1983 Penumbral Lunar Eclipse|url=https://www.timeanddate.com/eclipse/lunar/1983-december-20|publisher=timeanddate|access-date=6 January 2025}}</ref> with an umbral [[Magnitude of eclipse|magnitude]] of −0.1167. 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 2.7 days before [[Apsis|perigee]] (on December 22, 1983, at 18:25 UTC), the Moon's apparent diameter was larger.<ref>{{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}}</ref>

== Visibility ==
The eclipse was completely visible over much of [[North America]], [[South America]], [[Europe]], much of [[Africa]], and [[west Asia|west]] and [[north Asia]], seen rising over western North America and the eastern [[Pacific Ocean]] and setting over [[southeast Africa]] and [[central Asia|central]] and [[south Asia]].<ref>{{cite web|title=Penumbral Lunar Eclipse of 1983 Dec 20|url=https://eclipse.gsfc.nasa.gov/LEplot/LEplot1951/LE1983Dec20N.pdf|publisher=NASA|access-date=6 January 2025}}</ref>

{| class=wikitable
|[[File:Lunar eclipse from moon-1983Dec20.png|300px]] [[File:Lunar eclipse chart close-1983Dec20.png|300px]]
|}

== Eclipse details ==
Shown below is a table displaying details about this particular solar eclipse. It describes various parameters pertaining to this eclipse.<ref>{{cite web|title=Penumbral Lunar Eclipse of 1983 Dec 20|url=https://eclipsewise.com/lunar/LEprime/1901-2000/LE1983Dec20Nprime.html|publisher=EclipseWise.com|access-date=6 January 2025}}</ref>

{|class="wikitable" align="{{{align|left}}}" style="margin:{{#ifeq:{{{align}}}|right|0 0 0.5em 1em|0 1em 0.5em 0}}"
|+December 20, 1983 Lunar Eclipse Parameters
! Parameter
! Value
|-
| Penumbral Magnitude
| 0.88903
|-
| Umbral Magnitude
| −0.11673
|-
| Gamma
| 1.07468
|-
| Sun Right Ascension
| 17h49m31.1s
|-
| Sun Declination
| -23°25'11.7"
|-
| Sun Semi-Diameter
| 16'15.5"
|-
| Sun Equatorial Horizontal Parallax
| 08.9"
|-
| Moon Right Ascension
| 05h48m58.9s
|-
| Moon Declination
| +24°28'31.2"
|-
| Moon Semi-Diameter
| 16'09.9"
|-
| Moon Equatorial Horizontal Parallax
| 0°59'19.5"
|-
| ΔT
| 53.7 s
|}
{{clear}}

== Eclipse season ==
{{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]].

{| class="wikitable"
|+ Eclipse season of December 1983
! [[Solar eclipse of December 4, 1983|December 4]] Descending node (new moon) || December 20 Ascending node (full moon) 
|-
| [[File:SE1983Dec04A.png|200px]] || [[File:Lunar eclipse chart close-1983Dec20.png|200px]]
|- align=center
| [[Total eclipse#Types|Annular solar eclipse]] Solar Saros 132 || [[Lunar eclipse#Types of lunar eclipse|Penumbral lunar eclipse]] Lunar Saros 144
|}

== Related eclipses ==
=== Eclipses in 1983 ===
* [[Solar eclipse of June 11, 1983|A total solar eclipse on June 11]].
* [[June 1983 lunar eclipse|A partial lunar eclipse on June 25]].
* [[Solar eclipse of December 4, 1983|An annular solar eclipse on December 4]].
* '''A penumbral lunar eclipse on December 20.'''

=== Metonic ===
* Preceded by: [[March 1980 lunar eclipse|Lunar eclipse of March 1, 1980]]
* Followed by: [[October 1987 lunar eclipse|Lunar eclipse of October 7, 1987]]

=== Tzolkinex ===
* Preceded by: [[November 1976 lunar eclipse|Lunar eclipse of November 6, 1976]]
* Followed by: [[January 1991 lunar eclipse|Lunar eclipse of January 30, 1991]]

=== Half-Saros ===
* Preceded by: [[Solar eclipse of December 13, 1974]]
* Followed by: [[Solar eclipse of December 24, 1992]]

=== Tritos ===
* Preceded by: [[January 1973 lunar eclipse|Lunar eclipse of January 18, 1973]]
* Followed by: [[November 1994 lunar eclipse|Lunar eclipse of November 18, 1994]]

=== Lunar Saros 144 ===
* Preceded by: [[December 1965 lunar eclipse|Lunar eclipse of December 8, 1965]]
* Followed by: [[December 2001 lunar eclipse|Lunar eclipse of December 30, 2001]]

=== Inex ===
* Preceded by: [[January 1955 lunar eclipse|Lunar eclipse of January 8, 1955]]
* Followed by: [[November 2012 lunar eclipse|Lunar eclipse of November 28, 2012]]

=== Triad ===
* Preceded by: [[February 1897 lunar eclipse|Lunar eclipse of February 17, 1897]]
* Followed by: [[October 2070 lunar eclipse|Lunar eclipse of October 19, 2070]]

=== Lunar eclipses of 1980–1984 ===
{{Lunar eclipse set 1980-1984}}

=== Saros 144 ===
{{Lunar Saros series 144}}

=== Tritos series ===
{{Lunar Tritos series October 2005}}

=== Inex series ===
{{Lunar Inex series November 2012}}

=== Half-Saros cycle ===
A lunar eclipse will be preceded and followed by solar eclipses by 9 years and 5.5 days (a [[Saros (astronomy)#Relationship between lunar and solar saros .28sar.29|half saros]]).<ref>Mathematical Astronomy Morsels, Jean Meeus, p.110, Chapter 18, ''The half-saros''</ref> This lunar eclipse is related to two partial solar eclipses of [[Solar Saros 151]].
{| class=wikitable
![[Solar eclipse of December 13, 1974|December 13, 1974]]
![[Solar eclipse of December 24, 1992|December 24, 1992]]
|-
|[[File:SE1974Dec13P.png|240px]]
|[[File:SE1992Dec24P.png|240px]]
|}

== See also ==
*[[List of lunar eclipses]]
*[[List of 20th-century lunar eclipses]]

== Notes ==
{{reflist}}

== External links ==
* {{LEplot1951 link|1983|Dec|20|N}}

{{Lunar eclipses}}

{{DEFAULTSORT:Lunar eclipse 1983-12}}
[[Category:20th-century lunar eclipses|1983-12]]
[[Category:1983 in science]]
[[Category:December 1983]]

December 1983 lunar eclipse - Revision history

imported>BunnysBot: /* Eclipse season */ Fix CW Errors with GenFixes (T1)