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{{Short description|Penumbral lunar eclipse May 15, 1984}}
{{Infobox lunar eclipse
| type = penumbral
| image = Lunar eclipse chart close-1984May15.png
| caption = The Moon's hourly motion shown right to left
| date = May 15, 1984
| gamma = 1.1131
| magnitude = −0.1759
| saros_ser = 111
| saros_no = 65 of 71
| penumbral = 232 minutes, 31 seconds
| p1 = 2:43:49
| greatest = 4:40:09
| p4 = 6:36:20
| previous = December 1983
| next = June 1984
}}
A penumbral [[lunar eclipse]] occurred at the Moon’s [[Lunar node|descending node]] of orbit on Tuesday, May 15, 1984,<ref>{{cite web|title=May 14–15, 1984 Penumbral Lunar Eclipse|url=https://www.timeanddate.com/eclipse/lunar/1984-may-15|publisher=timeanddate|access-date=6 January 2025}}</ref> with an umbral [[Magnitude of eclipse|magnitude]] of −0.1759. 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 [[Apsis|perigee]] (on May 12, 1984, at 4:05 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=1984&n=136|publisher=timeanddate|access-date=6 January 2025}}</ref>

== Visibility ==
The eclipse was completely visible over much of [[North America]], [[South America]], and [[Antarctica]], seen rising over northwestern North America and the central [[Pacific Ocean]] and setting over [[Africa]] and much of [[Europe]].<ref>{{cite web|title=Penumbral Lunar Eclipse of 1984 May 15|url=https://eclipse.gsfc.nasa.gov/LEplot/LEplot1951/LE1984May15N.pdf|publisher=NASA|access-date=6 January 2025}}</ref>

{| class=wikitable
|[[File:Lunar eclipse from moon-1984May15.png|300px]] [[File:Lunar eclipse chart close-1984May15.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 1984 May 15|url=https://eclipsewise.com/lunar/LEprime/1901-2000/LE1984May15Nprime.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}}"
|+May 15, 1984 Lunar Eclipse Parameters
! Parameter
! Value
|-
| Penumbral Magnitude
| 0.80710
|-
| Umbral Magnitude
| −0.17593
|-
| Gamma
| 1.11308
|-
| Sun Right Ascension
| 03h28m40.8s
|-
| Sun Declination
| +18°54'19.8"
|-
| Sun Semi-Diameter
| 15'49.2"
|-
| Sun Equatorial Horizontal Parallax
| 08.7"
|-
| Moon Right Ascension
| 15h30m13.7s
|-
| Moon Declination
| -17°52'23.9"
|-
| Moon Semi-Diameter
| 16'05.6"
|-
| Moon Equatorial Horizontal Parallax
| 0°59'03.7"
|-
| ΔT
| 54.0 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]]. The first and last eclipse in this sequence is separated by one [[month#Synodic month|synodic month]].

{| class="wikitable"
|+ Eclipse season of May–June 1984
! May 15 Descending node (full moon) !! [[Solar eclipse of May 30, 1984|May 30]] Ascending node (new moon) !! [[June 1984 lunar eclipse|June 13]] Descending node (full moon) 
|-
| [[File:Lunar eclipse chart close-1984May15.png|200px]] || [[File:SE1984May30A.png|200px]] || [[File:Lunar eclipse chart close-1984Jun13.png|200px]]
|- align=center
| [[Lunar eclipse#Types of lunar eclipse|Penumbral lunar eclipse]] Lunar Saros 111 || [[Total eclipse#Types|Annular solar eclipse]] Solar Saros 137 || [[Lunar eclipse#Types of lunar eclipse|Penumbral lunar eclipse]] Lunar Saros 149
|}

== Related eclipses ==
=== Eclipses in 1984 ===
* '''A penumbral lunar eclipse on May 15.'''
* [[Solar eclipse of May 30, 1984|An annular solar eclipse on May 30]].
* [[June 1984 lunar eclipse|A penumbral lunar eclipse on June 13]].
* [[November 1984 lunar eclipse|A penumbral lunar eclipse on November 8]].
* [[Solar eclipse of November 22, 1984|A total solar eclipse on November 22]].

=== Metonic ===
* Preceded by: [[July 1980 lunar eclipse|Lunar eclipse of July 27, 1980]]
* Followed by: [[March 1988 lunar eclipse|Lunar eclipse of March 3, 1988]]

=== Tzolkinex ===
* Preceded by: [[April 1977 lunar eclipse|Lunar eclipse of April 4, 1977]]
* Followed by: [[June 1991 lunar eclipse|Lunar eclipse of June 27, 1991]]

=== Half-Saros ===
* Preceded by: [[Solar eclipse of May 11, 1975]]
* Followed by: [[Solar eclipse of May 21, 1993]]

=== Tritos ===
* Preceded by: [[June 1973 lunar eclipse|Lunar eclipse of June 15, 1973]]
* Followed by: [[April 1995 lunar eclipse|Lunar eclipse of April 15, 1995]]

=== Lunar Saros 111 ===
* Preceded by: [[May 1966 lunar eclipse|Lunar eclipse of May 4, 1966]]
* Followed by: [[May 2002 lunar eclipse|Lunar eclipse of May 26, 2002]]

=== Inex ===
* Preceded by: [[June 1955 lunar eclipse|Lunar eclipse of June 5, 1955]]
* Followed by: [[April 2013 lunar eclipse|Lunar eclipse of April 25, 2013]]

=== Triad ===
* Preceded by: [[July 1897 lunar eclipse|Lunar eclipse of July 14, 1897]]
* Followed by: [[March 2071 lunar eclipse|Lunar eclipse of March 16, 2071]]

=== Lunar eclipses of 1984–1987 ===
{{Lunar eclipse set 1984-1987}}

=== Metonic series ===
{{Metonic lunar eclipse 1984-2041}}

=== Saros 111 ===
{{Lunar Saros series 111}}

=== Tritos series ===
{{Lunar Tritos series March 2006}}

=== Inex series ===
{{Lunar Inex series April 2013}}

=== 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 118]].
{| class=wikitable
![[Solar eclipse of May 11, 1975|May 11, 1975]]
![[Solar eclipse of May 21, 1993|May 21, 1993]]
|-
|[[File:SE1975May11P.png|240px]]
|[[File:SE1993May21P.png|240px]]
|}

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

== Notes ==
{{reflist}}

==External links ==
* {{LEplot1951 link|1984|May|15|N}}

{{Lunar eclipses}}

{{DEFAULTSORT:Lunar eclipse 1984-05}}
[[Category:20th-century lunar eclipses|1984-05]]
[[Category:1984 in science]]
[[Category:May 1984]]

May 1984 lunar eclipse - Revision history

imported>BunnysBot: Fix CW Errors with GenFixes (T1), removed stub tag