October 1940 lunar eclipse

{{Infobox lunar eclipse

| type = penumbral

| image = Lunar eclipse chart close-1940Oct16.png

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

| date = October 16, 1940

| gamma = −1.1925

| magnitude = −0.3749

| saros_ser = 145

| saros_no = 7 of 71

| penumbral = 247 minutes, 58 seconds

| p1 = 5:56:54

| greatest = 8:00:53

| p4 = 10:04:52

| previous = April 1940

| next = March 1941

}}

A penumbral lunar eclipse occurred at the Moon’s descending node of orbit on Wednesday, October 16, 1940,{{cite web|title=October 15–16, 1940 Penumbral Lunar Eclipse|url=https://www.timeanddate.com/eclipse/lunar/1940-october-16|publisher=timeanddate|access-date=18 December 2024}} with an umbral magnitude of −0.3749. 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 only about 21 hours after apogee (on October 15, 1940, at 11:00 UTC), the Moon's apparent diameter was smaller.{{cite web|title=Moon Distances for London, United Kingdom, England|url=https://www.timeanddate.com/astronomy/moon/distance.html?year=1940&n=136|publisher=timeanddate|access-date=18 December 2024}}

Visibility

The eclipse was completely visible over North America and western South America, seen rising over East Asia and Australia and setting over eastern South America, West Africa, and Western Europe.{{cite web|title=Penumbral Lunar Eclipse of 1940 Oct 16|url=https://eclipse.gsfc.nasa.gov/LEplot/LEplot1901/LE1940Oct16N.pdf|publisher=NASA|access-date=18 December 2024}}

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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 1940 Oct 16|url=https://eclipsewise.com/lunar/LEprime/1901-2000/LE1940Oct16Nprime.html|publisher=EclipseWise.com|access-date=18 December 2024}}

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|+October 16, 1940 Lunar Eclipse Parameters

! Parameter

! Value

Penumbral Magnitude

| 0.71567

Umbral Magnitude

| −0.37489

Gamma

| −1.19248

Sun Right Ascension

| 13h24m23.2s

Sun Declination

| -08°52'19.1"

Sun Semi-Diameter

| 16'03.0"

Sun Equatorial Horizontal Parallax

| 08.8"

Moon Right Ascension

| 01h25m35.5s

Moon Declination

| +07°50'26.8"

Moon Semi-Diameter

| 14'43.0"

Moon Equatorial Horizontal Parallax

| 0°54'00.7"

ΔT

| 24.7 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.

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|+ Eclipse season of October 1940

! October 1
Ascending node (new moon) !! October 16
Descending node (full moon)

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| Total solar eclipse
Solar Saros 133

Penumbral lunar eclipse
Lunar Saros 145

Related eclipses

= Eclipses in 1940 =

A penumbral lunar eclipse on March 23.
An annular solar eclipse on April 7.
A penumbral lunar eclipse on April 22.
A total solar eclipse on October 1.
A penumbral lunar eclipse on October 16.

= Metonic =

Preceded by: Lunar eclipse of December 28, 1936
Followed by: Lunar eclipse of August 4, 1944

= Tzolkinex =

Preceded by: Lunar eclipse of September 4, 1933
Followed by: Lunar eclipse of November 28, 1947

= Half-Saros =

Preceded by: Solar eclipse of October 11, 1931
Followed by: Solar eclipse of October 21, 1949

= Tritos =

Preceded by: Lunar eclipse of November 17, 1929
Followed by: Lunar eclipse of September 15, 1951

= Lunar Saros 145 =

Preceded by: Lunar eclipse of October 6, 1922
Followed by: Lunar eclipse of October 27, 1958

= Inex =

Preceded by: Lunar eclipse of November 6, 1911
Followed by: Lunar eclipse of September 25, 1969

= Triad =

Preceded by: Lunar eclipse of December 15, 1853
Followed by: Lunar eclipse of August 17, 2027

= Lunar eclipses of 1937–1940 =

= Saros 145 =

= Tritos series =

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!colspan=10| Series members between 1801 and 2060

colspan=2 style="text-align:center;"| 1809 Oct 23
(Saros 133)

|colspan=2 style="text-align:center;"| 1820 Sep 22
(Saros 134)

|colspan=2 style="text-align:center;"| 1831 Aug 23
(Saros 135)

|colspan=2 style="text-align:center;"| 1842 Jul 22
(Saros 136)

|colspan=2 style="text-align:center;"| 1853 Jun 21
(Saros 137)

colspan=2 style="text-align:center;"| 1864 May 21
(Saros 138)

|colspan=2 style="text-align:center;"| 1875 Apr 20
(Saros 139)

|colspan=2 style="text-align:center;"| 1886 Mar 20
(Saros 140)

|colspan=2 style="text-align:center;"| 1897 Feb 17
(Saros 141)

|colspan=2 style="text-align:center;"| 1908 Jan 18
(Saros 142)

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colspan=2 style="text-align:center;"| 1918 Dec 17
(Saros 143)

|colspan=2 style="text-align:center;"| 1929 Nov 17
(Saros 144)

|colspan=2 style="text-align:center;"| 1940 Oct 16
(Saros 145)

|colspan=2 style="text-align:center;"| 1951 Sep 15
(Saros 146)

|colspan=2 style="text-align:center;"| 1962 Aug 15
(Saros 147)

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colspan=2 style="text-align:center;"| 1973 Jul 15
(Saros 148)

|colspan=2 style="text-align:center;"| 1984 Jun 13
(Saros 149)

|colspan=2 style="text-align:center;"|

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colspan=2 style="text-align:center;"|

|colspan=2 style="text-align:center;"|

|colspan=2 style="text-align:center;"| 2060 Nov 08
(Saros 156)

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= 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 two partial solar eclipses of Solar Saros 152.

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