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{{Short description|Total lunar eclipse}}
{{Infobox lunar eclipse
| type = total
| image = Lunar eclipse chart close-1975May25.png
| caption = The Moon's hourly motion shown right to left
| date = May 25, 1975
| gamma = 0.2367
| magnitude = 1.4253
| saros_ser = 130
| saros_no = 32 of 72
| totality = 88 minutes, 18 seconds
| partiality = 215 minutes, 11 seconds
| penumbral = 335 minutes, 54 seconds
| p1 = 3:00:07
| u1 = 4:00:24
| u2 = 5:03:51
| greatest = 5:48:01
| u3 = 6:32:09
| u4 = 7:35:35
| p4 = 8:36:00
| previous = November 1974
| next = November 1975
}}
A total [[lunar eclipse]] occurred at the Moon’s [[Lunar node|ascending node]] of orbit on Sunday, May 25, 1975,<ref>{{cite web|title=May 24–25, 1975 Total Lunar Eclipse (Blood Moon)|url=https://www.timeanddate.com/eclipse/lunar/1975-may-25|publisher=timeanddate|access-date=4 January 2025}}</ref> with an umbral [[Magnitude of eclipse|magnitude]] of 1.4253. It was a [[List of central lunar eclipses|central lunar eclipse]], in which part of the [[Moon]] passed through the [[antisolar point|center]] of the [[Earth's shadow]]. 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 4.4 days after [[Apsis|perigee]] (on May 20, 1975, at 20:50 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=1975&n=136|publisher=timeanddate|access-date=4 January 2025}}</ref>

This was the first central lunar eclipse of [[Lunar Saros 130]].

== Visibility ==
The eclipse was completely visible over much of [[North America]], [[South America]], and [[Antarctica]], seen rising over eastern [[Australia]], northwestern North America, and the central [[Pacific Ocean]] and setting over [[western Europe]] and [[Africa]].<ref>{{cite web|title=Total Lunar Eclipse of 1975 May 25|url=https://eclipse.gsfc.nasa.gov/LEplot/LEplot1951/LE1975May25T.pdf|publisher=NASA|access-date=4 January 2025}}</ref>

{| class=wikitable
|[[File:Lunar eclipse from moon-1975May25.png|300px]] [[File:Lunar eclipse chart close-1975May25.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 1975 May 25|url=https://eclipsewise.com/lunar/LEprime/1901-2000/LE1975May25Tprime.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}}"
|+May 25, 1975 Lunar Eclipse Parameters
! Parameter
! Value
|-
| Penumbral Magnitude
| 2.42179
|-
| Umbral Magnitude
| 1.42533
|-
| Gamma
| 0.23674
|-
| Sun Right Ascension
| 04h05m34.7s
|-
| Sun Declination
| +20°50'24.7"
|-
| Sun Semi-Diameter
| 15'47.5"
|-
| Sun Equatorial Horizontal Parallax
| 08.7"
|-
| Moon Right Ascension
| 16h05m40.2s
|-
| Moon Declination
| -20°36'42.2"
|-
| Moon Semi-Diameter
| 15'50.9"
|-
| Moon Equatorial Horizontal Parallax
| 0°58'09.7"
|-
| ΔT
| 45.9 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 May 1975
! [[Solar eclipse of May 11, 1975|May 11]] Descending node (new moon) !! May 25 Ascending node (full moon) 
|-
| [[File:SE1975May11P.png|200px]] || [[File:Lunar eclipse chart close-1975May25.png|200px]]
|- align=center
| [[Total eclipse#Types|Partial solar eclipse]] Solar Saros 118 || [[Lunar eclipse#Types of lunar eclipse|Total lunar eclipse]] Lunar Saros 130
|}

== Related eclipses ==
=== Eclipses in 1975 ===
* [[Solar eclipse of May 11, 1975|A partial solar eclipse on May 11]].
* '''A total lunar eclipse on May 25.'''
* [[Solar eclipse of November 3, 1975|A partial solar eclipse on November 3]].
* [[November 1975 lunar eclipse|A total lunar eclipse on November 18]].

=== Metonic ===
* Preceded by: [[August 1971 lunar eclipse|Lunar eclipse of August 6, 1971]]
* Followed by: [[March 1979 lunar eclipse|Lunar eclipse of March 13, 1979]]

=== Tzolkinex ===
* Preceded by: [[April 1968 lunar eclipse|Lunar eclipse of April 13, 1968]]
* Followed by: [[July 1982 lunar eclipse|Lunar eclipse of July 6, 1982]]

=== Half-Saros ===
* Preceded by: [[Solar eclipse of May 20, 1966]]
* Followed by: [[Solar eclipse of May 30, 1984]]

=== Tritos ===
* Preceded by: [[June 1964 lunar eclipse|Lunar eclipse of June 25, 1964]]
* Followed by: [[April 1986 lunar eclipse|Lunar eclipse of April 24, 1986]]

=== Lunar Saros 130 ===
* Preceded by: [[May 1957 lunar eclipse|Lunar eclipse of May 13, 1957]]
* Followed by: [[June 1993 lunar eclipse|Lunar eclipse of June 4, 1993]]

=== Inex ===
* Preceded by: [[June 1946 lunar eclipse|Lunar eclipse of June 14, 1946]]
* Followed by: [[May 2004 lunar eclipse|Lunar eclipse of May 4, 2004]]

=== Triad ===
* Preceded by: [[July 1888 lunar eclipse|Lunar eclipse of July 23, 1888]]
* Followed by: [[March 2062 lunar eclipse|Lunar eclipse of March 25, 2062]]

=== Lunar eclipses of 1973–1976 ===
{{Lunar eclipse set 1973-1976}}

=== Saros 130 ===
{{Lunar Saros series 130}}

=== Tritos series ===
{{Lunar Tritos series February 2008}}

=== Inex series ===
{{Lunar Inex series May 2004}}

=== 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 137]].
{| class=wikitable
![[Solar eclipse of May 20, 1966|May 20, 1966]]
![[Solar eclipse of May 30, 1984|May 30, 1984]]
|-
|[[File:SE1966May20A.png|240px]]
|[[File:SE1984May30A.png|240px]]
|}

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

== References ==
{{reflist}}

== External links ==
* {{LEplot1951 link|1975|May|25|T}}
* [http://adsabs.harvard.edu/full/1976RMxAA...1..351F The Total Lunar Eclipse of May 24-25, 1975, Feinstein, A., Forte, J. C., & Cabrera, A.]
{{Lunar eclipses}}

{{DEFAULTSORT:Lunar eclipse 1975-05}}
[[Category:20th-century lunar eclipses|1975-05]]
[[Category:Central total lunar eclipses|1975-05]]
[[Category:1975 in science]]
[[Category:May 1975]]

May 1975 lunar eclipse - Revision history

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