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{{Short description|Total lunar eclipse on April 13, 1968}}
{{Infobox lunar eclipse
| type = total
| image = Lunar eclipse chart close-1968Apr13.png
| caption = The Moon's hourly motion shown right to left
| date = April 13, 1968
| gamma = −0.4173
| magnitude = 1.1116
| saros_ser = 131
| saros_no = 31 of 72
| totality = 48 minutes, 31 seconds
| partiality = 194 minutes, 8 seconds
| penumbral = 309 minutes, 30 seconds
| p1 = 2:12:37
| u1 = 3:10:20
| u2 = 4:23:08
| greatest = 4:47:22
| u3 = 5:11:38
| u4 = 6:24:27
| p4 = 7:22:07
| previous = October 1967
| next = October 1968
}}
A total [[lunar eclipse]] occurred at the Moon’s [[Lunar node|descending node]] of orbit on Saturday, April 13, 1968,<ref>{{cite web|title=April 12–13, 1968 Total Lunar Eclipse (Blood Moon)|url=https://www.timeanddate.com/eclipse/lunar/1968-april-13|publisher=timeanddate|access-date=2 January 2025}}</ref> with an umbral [[Magnitude of eclipse|magnitude]] of 1.1116. A lunar eclipse occurs when the [[Moon]] moves into the [[Earth's shadow]], causing the Moon to be darkened. A total lunar eclipse occurs when the Moon's near side entirely passes into the Earth's umbral shadow. 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. A total lunar eclipse can last up to nearly two hours, while a total solar eclipse lasts only a few minutes at any given place, because the Moon's [[Umbra, penumbra and antumbra|shadow]] is smaller. Occurring about 1.1 days before [[Apsis|perigee]] (on April 14, 1968, at 7:50 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=1968&n=136|publisher=timeanddate|access-date=2 January 2025}}</ref>

This lunar eclipse was the third of a [[Tetrad (astronomy)|tetrad]], with four total lunar eclipses in series, the others being on [[April 1967 lunar eclipse|April 24, 1967]]; [[October 1967 lunar eclipse|October 18, 1967]]; and [[October 1968 lunar eclipse|October 6, 1968]].

== Visibility ==
The eclipse was completely visible over much of [[North America]] and [[South America]], seen rising over northwestern North America and the central [[Pacific Ocean]] and setting over [[Europe]], [[Africa]], and the [[Middle East]].<ref>{{cite web|title=Total Lunar Eclipse of 1968 Apr 13|url=https://eclipse.gsfc.nasa.gov/LEplot/LEplot1951/LE1968Apr13T.pdf|publisher=NASA|access-date=2 January 2025}}</ref>

{| class=wikitable
|[[File:Lunar eclipse from moon-1968Apr13.png|300px]] [[File:Lunar eclipse chart close-1968Apr13.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=Total Lunar Eclipse of 1968 Apr 13|url=https://eclipsewise.com/lunar/LEprime/1901-2000/LE1968Apr13Tprime.html|publisher=EclipseWise.com|access-date=2 January 2025}}</ref>

{|class="wikitable" align="{{{align|left}}}" style="margin:{{#ifeq:{{{align}}}|right|0 0 0.5em 1em|0 1em 0.5em 0}}"
|+April 13, 1968 Lunar Eclipse Parameters
! Parameter
! Value
|-
| Penumbral Magnitude
| 2.07253
|-
| Umbral Magnitude
| 1.11164
|-
| Gamma
| −0.41732
|-
| Sun Right Ascension
| 01h26m19.6s
|-
| Sun Declination
| +09°03'48.7"
|-
| Sun Semi-Diameter
| 15'56.9"
|-
| Sun Equatorial Horizontal Parallax
| 08.8"
|-
| Moon Right Ascension
| 13h25m32.2s
|-
| Moon Declination
| -09°26'23.0"
|-
| Moon Semi-Diameter
| 16'35.8"
|-
| Moon Equatorial Horizontal Parallax
| 1°00'54.7"
|-
| ΔT
| 38.5 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 March–April 1968
! [[Solar eclipse of March 28, 1968|March 28]] Ascending node (new moon) !! [[April 1968 lunar eclipse|April 13]] Descending node (full moon) 
|-
| [[File:SE1968Mar28P.png|200px]] || [[File:Lunar eclipse chart close-1968Apr13.png|200px]]
|- align=center
| [[Total eclipse#Types|Partial solar eclipse]] Solar Saros 119 || [[Lunar eclipse#Types of lunar eclipse|Total lunar eclipse]] Lunar Saros 131
|}

== Related eclipses ==
=== Eclipses in 1968 ===
* [[Solar eclipse of March 28, 1968|A partial solar eclipse on March 28]].
* '''A total lunar eclipse on April 13.'''
* [[Solar eclipse of September 22, 1968|A total solar eclipse on September 22]].
* [[October 1968 lunar eclipse|A total lunar eclipse on October 6]].

=== Metonic ===
* Preceded by: [[June 1964 lunar eclipse|Lunar eclipse of June 25, 1964]]
* Followed by: [[January 1972 lunar eclipse|Lunar eclipse of January 30, 1972]]

=== Tzolkinex ===
* Preceded by: [[March 1961 lunar eclipse|Lunar eclipse of March 2, 1961]]
* Followed by: [[May 1975 lunar eclipse|Lunar eclipse of May 25, 1975]]

=== Half-Saros ===
* Preceded by: [[Solar eclipse of April 8, 1959]]
* Followed by: [[Solar eclipse of April 18, 1977]]

=== Tritos ===
* Preceded by: [[May 1957 lunar eclipse|Lunar eclipse of May 13, 1957]]
* Followed by: [[March 1979 lunar eclipse|Lunar eclipse of March 13, 1979]]

=== Lunar Saros 131 ===
* Preceded by: [[April 1950 lunar eclipse|Lunar eclipse of April 2, 1950]]
* Followed by: [[April 1986 lunar eclipse|Lunar eclipse of April 24, 1986]]

=== Inex ===
* Preceded by: [[May 1939 lunar eclipse|Lunar eclipse of May 3, 1939]]
* Followed by: [[March 1997 lunar eclipse|Lunar eclipse of March 24, 1997]]

=== Triad ===
* Preceded by: [[June 1881 lunar eclipse|Lunar eclipse of June 12, 1881]]
* Followed by: [[February 2055 lunar eclipse|Lunar eclipse of February 11, 2055]]

=== Lunar eclipses of 1966–1969 ===
{{Lunar eclipse set 1966–1969}}

=== Saros 131 ===
{{Lunar Saros series 131}}

=== Tritos series ===
{{Lunar Tritos series January 2001}}

=== Inex series ===
{{Lunar Inex series March 2026}}

=== 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 annular solar eclipses of [[Solar Saros 138]].
{| class=wikitable
![[Solar eclipse of April 8, 1959|April 8, 1959]]
![[Solar eclipse of April 18, 1977|April 18, 1977]]
|-
|[[File:SE1959Apr08A.png|240px]]
|[[File:SE1977Apr18A.png|240px]]
|}

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

==Notes==
{{reflist}}

==External links==
*{{LEplot1951 link|1968|Apr|13|T}}

{{Lunar eclipses}}

{{DEFAULTSORT:Lunar eclipse 1968-04}}
[[Category:20th-century lunar eclipses|1968-04]]
[[Category:1968 in science]]
[[Category:April 1968]]

April 1968 lunar eclipse - Revision history

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