May 1937 lunar eclipse

{{Infobox lunar eclipse

| type = penumbral

| image = Lunar eclipse chart close-1937May25.png

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

| date = May 25, 1937

| gamma = −1.1582

| magnitude = −0.3033

| saros_ser = 110

| saros_no = 67 of 72

| penumbral = 254 minutes, 43 seconds

| p1 = 5:43:50

| greatest = 7:51:10

| p4 = 9:58:33

| previous = December 1936

| next = November 1937

}}

A penumbral lunar eclipse occurred at the Moon’s ascending node of orbit on Tuesday, May 25, 1937,{{cite web|title=May 24–25, 1937 Penumbral Lunar Eclipse|url=https://www.timeanddate.com/eclipse/lunar/1937-may-25|publisher=timeanddate|access-date=18 December 2024}} with an umbral magnitude of −0.3033. 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 18 hours after apogee (on May 24, 1937, at 13:30 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=1937&n=136|publisher=timeanddate|access-date=18 December 2024}}

Visibility

The eclipse was completely visible over much of North America, western and central South America, and Antarctica, seen rising over Australia and setting over northeastern North America, eastern South America, and west Africa.{{cite web|title=Penumbral Lunar Eclipse of 1937 May 25|url=https://eclipse.gsfc.nasa.gov/LEplot/LEplot1901/LE1937May25N.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 1937 May 25|url=https://eclipsewise.com/lunar/LEprime/1901-2000/LE1937May25Nprime.html|publisher=EclipseWise.com|access-date=18 December 2024}}

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|+May 25, 1937 Lunar Eclipse Parameters

! Parameter

! Value

Penumbral Magnitude

| 0.76969

Umbral Magnitude

| −0.30327

Gamma

| −1.15820

Sun Right Ascension

| 04h06m39.7s

Sun Declination

| +20°53'38.5"

Sun Semi-Diameter

| 15'47.3"

Sun Equatorial Horizontal Parallax

| 08.7"

Moon Right Ascension

| 16h06m15.0s

Moon Declination

| -21°55'55.1"

Moon Semi-Diameter

| 14'42.9"

Moon Equatorial Horizontal Parallax

| 0°54'00.1"

ΔT

| 23.9 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 May–June 1937

! May 25
Ascending node (full moon) !! June 8
Descending node (new moon)

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| Penumbral lunar eclipse
Lunar Saros 110

Total solar eclipse
Solar Saros 136

Related eclipses

= Eclipses in 1937 =

A penumbral lunar eclipse on May 25.
A total solar eclipse on June 8.
A partial lunar eclipse on November 18.
An annular solar eclipse on December 2.

= Metonic =

Preceded by: Lunar eclipse of August 5, 1933
Followed by: Lunar eclipse of March 13, 1941

= Tzolkinex =

Preceded by: Lunar eclipse of April 13, 1930
Followed by: Lunar eclipse of July 6, 1944

= Half-Saros =

Preceded by: Solar eclipse of May 19, 1928
Followed by: Solar eclipse of May 30, 1946

= Tritos =

Preceded by: Lunar eclipse of June 25, 1926
Followed by: Lunar eclipse of April 23, 1948

= Lunar Saros 110 =

Preceded by: Lunar eclipse of May 15, 1919
Followed by: Lunar eclipse of June 5, 1955

= Inex =

Preceded by: Lunar eclipse of June 14, 1908
Followed by: Lunar eclipse of May 4, 1966

= Triad =

Preceded by: Lunar eclipse of July 24, 1850
Followed by: Lunar eclipse of March 25, 2024

= Lunar eclipses of 1937–1940 =

= Saros 110 =

= 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 total and one partial = two solar eclipses of Solar Saros 117.

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