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Related eclipses

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{{Short description|Partial lunar eclipse April 4, 1977}}
{{Infobox lunar eclipse
| type = partial
| image = Lunar eclipse chart close-1977Apr04.png
| caption = The Moon's hourly motion shown right to left
| date = April 4, 1977
| gamma = −0.9148
| magnitude = 0.1929
| saros_ser = 112
| saros_no = 63 of 72
| partiality = 94 minutes, 44 seconds
| penumbral = 262 minutes, 52 seconds
| p1 = 2:06:52
| u1 = 3:30:58
| greatest = 4:18:16
| u4 = 5:05:42
| p4 = 6:29:44
| previous = November 1976
| next = September 1977
}}
A partial [[lunar eclipse]] occurred at the Moon’s [[Lunar node|ascending node]] of orbit on Monday, April 4, 1977,<ref>{{cite web|title=April 3–4, 1977 Partial Lunar Eclipse|url=https://www.timeanddate.com/eclipse/lunar/1977-april-4|publisher=timeanddate|access-date=4 January 2025}}</ref> with an umbral [[Magnitude of eclipse|magnitude]] of 0.1929. 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 1.7 days before [[Apsis|perigee]] (on April 5, 1977, at 21:50 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=1977&n=136|publisher=timeanddate|access-date=4 January 2025}}</ref>

== Visibility ==
The eclipse was completely visible over much of [[North America]], [[South America]], and [[west Africa]], seen rising over western North America and the central [[Pacific Ocean]] and setting over [[Africa]], [[Europe]] and the [[Middle East]].<ref>{{cite web|title=Partial Lunar Eclipse of 1977 Apr 04|url=https://eclipse.gsfc.nasa.gov/LEplot/LEplot1951/LE1977Apr04P.pdf|publisher=NASA|access-date=4 January 2025}}</ref>

{| class=wikitable
|[[File:Lunar eclipse from moon-1977Apr04.png|300px]] [[File:Lunar eclipse chart close-1977Apr04.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=Partial Lunar Eclipse of 1977 Apr 04|url=https://eclipsewise.com/lunar/LEprime/1901-2000/LE1977Apr04Pprime.html|publisher=EclipseWise.com|access-date=4 January 2025}}</ref>

{|class="wikitable" align="{{{align|left}}}" style="margin:{{#ifeq:{{{align}}}|right|0 0 0.5em 1em|0 1em 0.5em 0}}"
|+April 4, 1977 Lunar Eclipse Parameters
! Parameter
! Value
|-
| Penumbral Magnitude
| 1.16570
|-
| Umbral Magnitude
| 0.19289
|-
| Gamma
| −0.91483
|-
| Sun Right Ascension
| 00h52m35.5s
|-
| Sun Declination
| +05°37'56.4"
|-
| Sun Semi-Diameter
| 15'59.4"
|-
| Sun Equatorial Horizontal Parallax
| 08.8"
|-
| Moon Right Ascension
| 12h51m29.8s
|-
| Moon Declination
| -06°30'38.9"
|-
| Moon Semi-Diameter
| 16'26.2"
|-
| Moon Equatorial Horizontal Parallax
| 1°00'19.6"
|-
| ΔT
| 47.8 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 April 1977
! [[April 1977 lunar eclipse|April 4]] Ascending node (full moon) !! [[Solar eclipse of April 18, 1977|April 18]] Descending node (new moon) 
|-
| [[File:Lunar eclipse chart close-1977Apr04.png|200px]] || [[File:SE1977Apr18A.png|200px]]
|- align=center
| [[Lunar eclipse#Types of lunar eclipse|Partial lunar eclipse]] Lunar Saros 112 || [[Total eclipse#Types|Annular solar eclipse]] Solar Saros 138
|}

== Related eclipses ==
=== Eclipses in 1977 ===
* '''A partial lunar eclipse on April 4.'''
* [[Solar eclipse of April 18, 1977|An annular solar eclipse on April 18]].
* [[September 1977 lunar eclipse|A penumbral lunar eclipse on September 27]].
* [[Solar eclipse of October 12, 1977|A total solar eclipse on October 12]].

=== Metonic ===
* Preceded by: [[June 1973 lunar eclipse|Lunar eclipse of June 15, 1973]]
* Followed by: [[January 1981 lunar eclipse|Lunar eclipse of January 20, 1981]]

=== Tzolkinex ===
* Preceded by: [[February 1970 lunar eclipse|Lunar eclipse of February 21, 1970]]
* Followed by: [[May 1984 lunar eclipse|Lunar eclipse of May 15, 1984]]

=== Half-Saros ===
* Preceded by: [[Solar eclipse of March 28, 1968]]
* Followed by: [[Solar eclipse of April 9, 1986]]

=== Tritos ===
* Preceded by: [[May 1966 lunar eclipse|Lunar eclipse of May 4, 1966]]
* Followed by: [[March 1988 lunar eclipse|Lunar eclipse of March 3, 1988]]

=== Lunar Saros 112 ===
* Preceded by: [[March 1959 lunar eclipse|Lunar eclipse of March 24, 1959]]
* Followed by: [[April 1995 lunar eclipse|Lunar eclipse of April 15, 1995]]

=== Inex ===
* Preceded by: [[April 1948 lunar eclipse|Lunar eclipse of April 23, 1948]]
* Followed by: [[March 2006 lunar eclipse|Lunar eclipse of March 14, 2006]]

=== Triad ===
* Preceded by: [[June 1890 lunar eclipse|Lunar eclipse of June 3, 1890]]
* Followed by: [[February 2064 lunar eclipse|Lunar eclipse of February 2, 2064]]

=== Lunar eclipses of 1977–1980 ===
{{Lunar eclipse set 1977-1980}}

=== Saros 112 ===
{{Lunar Saros series 112}}

=== Tritos series ===
{{Lunar Tritos series December 2009}}

=== Inex series ===
{{Lunar Inex series March 2006}}

=== 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 119]].
{| class=wikitable
![[Solar eclipse of March 28, 1968|March 28, 1968]]
![[Solar eclipse of April 9, 1986|April 9, 1986]]
|-
|[[File:SE1968Mar28P.png|240px]]
|[[File:SE1986Apr09P.png|240px]]
|}

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

== Notes ==
{{reflist}}

== External links ==
* {{LEplot1951 link|1977|Apr|04|P}}

{{Lunar eclipses}}

{{DEFAULTSORT:Lunar eclipse 1977-04}}
[[Category:20th-century lunar eclipses|1977-04]]
[[Category:1977 in science]]
[[Category:April 1977]]

{{lunar-eclipse-stub}}

April 1977 lunar eclipse - Revision history

imported>Weatherman4064: /* Related eclipses */