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{{Short description|Total lunar eclipse August 6, 1971}}
{{Infobox lunar eclipse
| type = total
| image = Lunar eclipse chart close-1971Aug06.png
| caption = The Moon's hourly motion shown right to left
| date = August 6, 1971
| gamma = −0.0794
| magnitude = 1.7283
| saros_ser = 128
| saros_no = 38 of 71
| totality = 99 minutes, 25 seconds
| partiality = 215 minutes, 30 seconds
| penumbral = 327 minutes, 17 seconds
| p1 = 16:59:29
| u1 = 17:55:26
| u2 = 18:53:28
| greatest = 19:43:10
| u3 = 20:32:53
| u4 = 21:30:56
| p4 = 22:26:46
| previous = February 1971
| next = January 1972
}}
A total [[lunar eclipse]] occurred at the Moon’s [[Lunar node|ascending node]] of orbit on Friday, August 6, 1971,<ref>{{cite web|title=August 6–7, 1971 Total Lunar Eclipse (Blood Moon)|url=https://www.timeanddate.com/eclipse/lunar/1971-august-6|publisher=timeanddate|access-date=3 January 2025}}</ref> with an umbral [[Magnitude of eclipse|magnitude]] of 1.7283. 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 2.3 days before [[Apsis|perigee]] (on August 9, 1971, at 2:00 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=1971&n=136|publisher=timeanddate|access-date=3 January 2025}}</ref>

== Visibility ==
The eclipse was completely visible over [[central Africa|central]] and [[east Africa]], much of [[Asia]], western [[Australia]], and [[Antarctica]], seen rising over central and eastern [[South America]], [[Europe]], and [[west Africa]] and setting over [[east Asia|east]] and [[northeast Asia]] and eastern Australia.<ref>{{cite web|title=Total Lunar Eclipse of 1971 Aug 06|url=https://eclipse.gsfc.nasa.gov/LEplot/LEplot1951/LE1971Aug06T.pdf|publisher=NASA|access-date=3 January 2025}}</ref>

{| class=wikitable
|[[File:Lunar eclipse from moon-1971Aug06.png|300px]] [[File:Lunar eclipse chart close-1971Aug06.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 1971 Aug 06|url=https://eclipsewise.com/lunar/LEprime/1901-2000/LE1971Aug06Tprime.html|publisher=EclipseWise.com|access-date=3 January 2025}}</ref>

{|class="wikitable" align="{{{align|left}}}" style="margin:{{#ifeq:{{{align}}}|right|0 0 0.5em 1em|0 1em 0.5em 0}}"
|+August 6, 1971 Lunar Eclipse Parameters
! Parameter
! Value
|-
| Penumbral Magnitude
| 2.69580
|-
| Umbral Magnitude
| 1.72830
|-
| Gamma
| −0.07944
|-
| Sun Right Ascension
| 09h04m36.6s
|-
| Sun Declination
| +16°43'16.0"
|-
| Sun Semi-Diameter
| 15'46.2"
|-
| Sun Equatorial Horizontal Parallax
| 08.7"
|-
| Moon Right Ascension
| 21h04m44.2s
|-
| Moon Declination
| -16°47'39.7"
|-
| Moon Semi-Diameter
| 16'17.9"
|-
| Moon Equatorial Horizontal Parallax
| 0°59'49.1"
|-
| ΔT
| 41.8 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]]. The first and last eclipse in this sequence is separated by one [[month#Synodic_month|synodic month]].

{| class="wikitable"
|+ Eclipse season of July–August 1971
! [[Solar eclipse of July 22, 1971|July 22]] Descending node (new moon) !! [[August 1971 lunar eclipse|August 6]] Ascending node (full moon) !! [[Solar eclipse of August 20, 1971|August 20]] Descending node (new moon) 
|-
| [[File:SE1971Jul22P.png|200px]] || [[File:Lunar eclipse chart close-1971Aug06.png|200px]] || [[File:SE1971Aug20P.png|200px]]
|- align=center
| [[Total eclipse#Types|Partial solar eclipse]] Solar Saros 116 || [[Lunar eclipse#Types of lunar eclipse|Total lunar eclipse]] Lunar Saros 128 || [[Total eclipse#Types|Partial solar eclipse]] Solar Saros 154
|}

== Related eclipses ==
=== Eclipses in 1971 ===
* [[February 1971 lunar eclipse|A total lunar eclipse on February 10]].
* [[Solar eclipse of February 25, 1971|A partial solar eclipse on February 25]].
* [[Solar eclipse of July 22, 1971|A partial solar eclipse on July 22]].
* '''A total lunar eclipse on August 6.'''
* [[Solar eclipse of August 20, 1971|A partial solar eclipse on August 20]].

=== Metonic ===
* Preceded by: [[October 1967 lunar eclipse|Lunar eclipse of October 18, 1967]]
* Followed by: [[May 1975 lunar eclipse|Lunar eclipse of May 25, 1975]]

=== Tzolkinex ===
* Preceded by: [[June 1964 lunar eclipse|Lunar eclipse of June 25, 1964]]
* Followed by: [[September 1978 lunar eclipse|Lunar eclipse of September 16, 1978]]

=== Half-Saros ===
* Preceded by: [[Solar eclipse of July 31, 1962]]
* Followed by: [[Solar eclipse of August 10, 1980]]

=== Tritos ===
* Preceded by: [[September 1960 lunar eclipse|Lunar eclipse of September 5, 1960]]
* Followed by: [[July 1982 lunar eclipse|Lunar eclipse of July 6, 1982]]

=== Lunar Saros 128 ===
* Preceded by: [[July 1953 lunar eclipse|Lunar eclipse of July 26, 1953]]
* Followed by: [[August 1989 lunar eclipse|Lunar eclipse of August 17, 1989]]

=== Inex ===
* Preceded by: [[August 1942 lunar eclipse|Lunar eclipse of August 26, 1942]]
* Followed by: [[July 2000 lunar eclipse|Lunar eclipse of July 16, 2000]]

=== Triad ===
* Preceded by: [[October 1884 lunar eclipse|Lunar eclipse of October 4, 1884]]
* Followed by: [[June 2058 lunar eclipse|Lunar eclipse of June 6, 2058]]

=== Lunar eclipses of 1969–1973 ===
{{Lunar eclipse set 1969–1973}}

=== Saros 128 ===
{{Lunar Saros series 128}}

=== Tritos series ===
{{Lunar Tritos series May 2004}}

=== Inex series ===
{{Lunar Inex series July 2000}}

=== 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 135]].

{| class=wikitable
![[Solar eclipse of July 31, 1962|July 31, 1962]]
![[Solar eclipse of August 10, 1980|August 10, 1980]]
|-
|[[File:SE1962Jul31A.png|240px]]
|[[File:SE1980Aug10A.png|240px]]
|}

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

==Notes==
{{reflist}}

==External links==
*{{LEplot1951 link|1971|Aug|06|T}}

{{Lunar eclipses}}

{{DEFAULTSORT:Lunar eclipse 1971-08}}
[[Category:Central total lunar eclipses|1971-08]]
[[Category:20th-century lunar eclipses|1971-08]]
[[Category:1971 in science]]
[[Category:August 1971]]

August 1971 lunar eclipse - Revision history

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