July 1980 lunar eclipse

{{Infobox lunar eclipse

| type = penumbral

| image = Lunar eclipse chart close-1980Jul27.png

| caption = The Moon's hourly motion shown right to left

| date = July 27, 1980

| gamma = 1.4139

| magnitude = −0.7263

| saros_ser = 109

| saros_no = 71 of 73

| penumbral = 137 minutes, 33 seconds

| p1 = 17:59:29

| greatest = 19:08:08

| p4 = 20:17:02

| previous = March 1980

| next = August 1980

}}

A penumbral lunar eclipse occurred at the Moon’s descending node of orbit on Sunday, July 27, 1980,{{cite web|title=July 27–28, 1980 Penumbral Lunar Eclipse|url=https://www.timeanddate.com/eclipse/lunar/1980-july-27|publisher=timeanddate|access-date=4 January 2025}} with an umbral magnitude of −0.7263. 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 3.2 days before perigee (on July 30, 1980, at 23:40 UTC), the Moon's apparent diameter was larger.{{cite web|title=Moon Distances for London, United Kingdom, England|url=https://www.timeanddate.com/astronomy/moon/distance.html?year=1980&n=136|publisher=timeanddate|access-date=4 January 2025}}

Visibility

The eclipse was completely visible over central and east Africa, eastern Europe, much of Asia, Australia, and Antarctica, seen rising over western Europe and west Africa and setting over northeast Asia and the western Pacific Ocean.{{cite web|title=Penumbral Lunar Eclipse of 1980 Jul 27|url=https://eclipse.gsfc.nasa.gov/LEplot/LEplot1951/LE1980Jul27N.pdf|publisher=NASA|access-date=4 January 2025}}

class=wikitable

|300px 300px

Eclipse details

Shown below is a table displaying details about this particular solar eclipse. It describes various parameters pertaining to this eclipse.{{cite web|title=Penumbral Lunar Eclipse of 1980 Jul 27|url=https://eclipsewise.com/lunar/LEprime/1901-2000/LE1980Jul27Nprime.html|publisher=EclipseWise.com|access-date=4 January 2025}}

class="wikitable" align="{{{align|left}}}" style="margin:{{#ifeq:{{{align}}}|right|0 0 0.5em 1em|0 1em 0.5em 0}}"

|+July 27, 1980 Lunar Eclipse Parameters

! Parameter

! Value

Penumbral Magnitude

| 0.25354

Umbral Magnitude

| −0.72634

Gamma

| 1.41391

Sun Right Ascension

| 08h28m52.6s

Sun Declination

| +19°02'51.8"

Sun Semi-Diameter

| 15'45.1"

Sun Equatorial Horizontal Parallax

| 08.7"

Moon Right Ascension

| 20h28m01.0s

Moon Declination

| -17°40'21.2"

Moon Semi-Diameter

| 16'04.5"

Moon Equatorial Horizontal Parallax

| 0°58'59.8"

ΔT

| 51.0 s

Eclipse season

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 synodic month.

class="wikitable"

|+ Eclipse season of July–August 1980

! July 27
Descending node (full moon)
!! August 10
Ascending node (new moon)
!! August 26
Descending node (full moon)

200px

align=center

| Penumbral lunar eclipse
Lunar Saros 109

Annular solar eclipse
Solar Saros 135

Penumbral lunar eclipse
Lunar Saros 147

Related eclipses

= Eclipses in 1980 =

A total solar eclipse on February 16.
A penumbral lunar eclipse on March 1.
A penumbral lunar eclipse on July 27.
An annular solar eclipse on August 10.
A penumbral lunar eclipse on August 26.

= Metonic =

Followed by: Lunar eclipse of May 15, 1984

= Tzolkinex =

Preceded by: Lunar eclipse of June 15, 1973

= Half-Saros =

Preceded by: Solar eclipse of July 22, 1971

= Tritos =

Preceded by: Lunar eclipse of August 27, 1969
Followed by: Lunar eclipse of June 27, 1991

= Lunar Saros 109 =

Preceded by: Lunar eclipse of July 17, 1962
Followed by: Lunar eclipse of August 8, 1998

= Inex =

Preceded by: Lunar eclipse of August 17, 1951
Followed by: Lunar eclipse of July 7, 2009

= Triad =

Preceded by: Lunar eclipse of September 25, 1893
Followed by: Lunar eclipse of May 28, 2067

= Lunar eclipses of 1980–1984 =

= Saros 109 =

= Tritos series =

= Inex series =

= Half-Saros cycle =

A lunar eclipse will be preceded and followed by solar eclipses by 9 years and 5.5 days (a half saros).Mathematical Astronomy Morsels, Jean Meeus, p.110, Chapter 18, The half-saros This lunar eclipse is related to one partial solar eclipse of Solar Saros 116.

class=wikitable

!July 22, 1971

240px