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Related eclipses

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{{Short description|Penumbral lunar eclipse July 26, 1991}}
{{Infobox lunar eclipse
| type = penumbral
| image = Lunar eclipse chart close-1991Jul26.png
| caption = The Moon's hourly motion shown right to left
| date = July 26, 1991
| gamma = 1.4370
| magnitude = −0.8109
| saros_ser = 148
| saros_no = 2 of 71
| penumbral = 152 minutes, 42 seconds
| p1 = 16:51:35
| greatest = 18:07:52
| p4 = 19:24:16
| previous = June 1991
| next = December 1991
}}
A penumbral [[lunar eclipse]] occurred at the Moon’s [[Lunar node|ascending node]] of orbit on Friday, July 26, 1991,<ref>{{cite web|title=July 26–27, 1991 Penumbral Lunar Eclipse|url=https://www.timeanddate.com/eclipse/lunar/1991-july-26|publisher=timeanddate|access-date=8 January 2025}}</ref> with an umbral [[Magnitude of eclipse|magnitude]] of −0.8109. 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 2.25 days after [[Apsis|apogee]] (on July 24, 1991, at 12:10 UTC), the Moon's apparent diameter was smaller.<ref>{{cite web|title=Moon Distances for London, United Kingdom, England|url=https://www.timeanddate.com/astronomy/moon/distance.html?year=1991&n=136|publisher=timeanddate|access-date=8 January 2025}}</ref>

This eclipse was the third of four lunar eclipses in 1991, with the others occurring on [[January 1991 lunar eclipse|January 30]] (penumbral), [[June 1991 lunar eclipse|June 27]] (penumbral), and [[December 1991 lunar eclipse|December 21]] (partial).

== Visibility ==
The eclipse was completely visible over [[east Africa]], much of [[Asia]], [[Australia]], and [[Antarctica]], seen rising over much of [[Europe]] and [[west Africa|west]] and [[central Africa]] and setting over [[northeast Asia]] and the central [[Pacific Ocean]].<ref>{{cite web|title=Penumbral Lunar Eclipse of 1991 Jul 26|url=https://eclipse.gsfc.nasa.gov/LEplot/LEplot1951/LE1991Jul26N.pdf|publisher=NASA|access-date=8 January 2025}}</ref>

{| class=wikitable
|[[File:Lunar eclipse from moon-1991Jul26.png|300px]] [[File:Lunar eclipse chart close-1991Jul26.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 1991 Jun 27|url=https://eclipsewise.com/lunar/LEprime/1901-2000/LE1991Jun27Nprime.html|publisher=EclipseWise.com|access-date=8 January 2025}}</ref>

{|class="wikitable" align="{{{align|left}}}" style="margin:{{#ifeq:{{{align}}}|right|0 0 0.5em 1em|0 1em 0.5em 0}}"
|+July 26, 1991 Lunar Eclipse Parameters
! Parameter
! Value
|-
| Penumbral Magnitude
| 0.25425
|-
| Umbral Magnitude
| −0.81093
|-
| Gamma
| 1.43698
|-
| Sun Right Ascension
| 08h22m14.5s
|-
| Sun Declination
| +19°25'45.6"
|-
| Sun Semi-Diameter
| 15'44.9"
|-
| Sun Equatorial Horizontal Parallax
| 08.7"
|-
| Moon Right Ascension
| 20h20m28.0s
|-
| Moon Declination
| -18°11'58.5"
|-
| Moon Semi-Diameter
| 14'47.1"
|-
| Moon Equatorial Horizontal Parallax
| 0°54'15.7"
|-
| ΔT
| 58.0 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 June–July 1991
! [[June 1991 lunar eclipse|June 27]] Ascending node (full moon) !! [[Solar eclipse of July 11, 1991|July 11]] Descending node (new moon) !! [[July 1991 lunar eclipse|July 26]] Ascending node (full moon) 
|-
| [[File:Lunar eclipse chart close-1991Jun27.png|200px]] || [[File:SE1991Jul11T.png|200px]] || [[File:Lunar eclipse chart close-1991Jul26.png|200px]]
|- align=center
| [[Lunar eclipse#Types of lunar eclipse|Penumbral lunar eclipse]] Lunar Saros 110 || [[Total eclipse#Types|Total solar eclipse]] Solar Saros 136 || [[Lunar eclipse#Types of lunar eclipse|Penumbral lunar eclipse]] Lunar Saros 148
|}

== Related eclipses ==

=== Eclipses in 1991 ===
* [[Solar eclipse of January 15, 1991|An annular solar eclipse on January 15]].
* [[January 1991 lunar eclipse|A penumbral lunar eclipse on January 30]].
* [[June 1991 lunar eclipse|A penumbral lunar eclipse on June 27]].
* [[Solar eclipse of July 11, 1991|A total solar eclipse on July 11]].
* '''A penumbral lunar eclipse on July 26.'''
* [[December 1991 lunar eclipse|A partial lunar eclipse on December 21]].

=== Metonic ===
* Preceded by: [[October 1987 lunar eclipse|Lunar eclipse of October 7, 1987]]

=== Tzolkinex ===
* Preceded by: [[June 1984 lunar eclipse|Lunar eclipse of June 13, 1984]]
* Followed by: [[September 1998 lunar eclipse|Lunar eclipse of September 6, 1998]]

=== Half-Saros ===
* Preceded by: [[Solar eclipse of July 20, 1982]]
* Followed by: [[Solar eclipse of July 31, 2000]]

=== Tritos ===
* Preceded by: [[August 1980 lunar eclipse|Lunar eclipse of August 26, 1980]]
* Followed by: [[June 2002 lunar eclipse|Lunar eclipse of June 24, 2002]]

=== Lunar Saros 148 ===
* Preceded by: [[July 1973 lunar eclipse|Lunar eclipse of July 15, 1973]]
* Followed by: [[August 2009 lunar eclipse|Lunar eclipse of August 6, 2009]]

=== Inex ===
* Preceded by: [[August 1962 lunar eclipse|Lunar eclipse of August 15, 1962]]
* Followed by: [[July 2020 lunar eclipse|Lunar eclipse of July 5, 2020]]

=== Triad ===
* Preceded by: [[September 1904 lunar eclipse|Lunar eclipse of September 24, 1904]]

=== Lunar eclipses of 1988–1991 ===
{{Lunar eclipse set 1988-1991}}

=== Saros 148 ===
{{Lunar Saros series 148}}

=== Tritos series ===
{{Lunar Tritos series June 2002}}

=== Inex series ===
{{Lunar Inex series July 2020}}

=== 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 155]].
{| class=wikitable
![[Solar eclipse of July 20, 1982|July 20, 1982]]
![[Solar eclipse of July 31, 2000|July 31, 2000]]
|-
|[[File:SE1982Jul20P.png|240px]]
|[[File:SE2000Jul31P.png|240px]]
|}

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

== Notes ==
{{reflist}}

== External links ==
* {{LEplot1951 link|1991|Jul|26|N}}

{{Lunar eclipses}}
{{Authority control}}

{{DEFAULTSORT:Lunar eclipse 1991-07}}
[[Category:20th-century lunar eclipses|1991-07]]
[[Category:1991 in science]]
[[Category:July 1991]]

{{lunar-eclipse-stub}}

July 1991 lunar eclipse - Revision history

imported>Weatherman4064: /* Related eclipses */