October 1940 lunar eclipse
| Penumbral eclipse | |||||||||
 The Moon's hourly motion shown right to left | |||||||||
| Date | October 16, 1940 | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Gamma | −1.1925 | ||||||||
| Magnitude | −0.3749 | ||||||||
| Saros cycle | 145 (7 of 71) | ||||||||
| Penumbral | 247 minutes, 58 seconds | ||||||||
| |||||||||
A penumbral lunar eclipse will occur at the Moon’s descending node of orbit on Wednesday, October 16, 1940,[1] 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.[2]
Visibility
[edit]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.[3]
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Eclipse details
[edit]Shown below is a table displaying details about this particular solar eclipse. It describes various parameters pertaining to this eclipse.[4]
| 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
[edit]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.
| October 1 Ascending node (new moon) |
October 16 Descending node (full moon) |
|---|---|
 |
|
| Total solar eclipse Solar Saros 133 |
Penumbral lunar eclipse Lunar Saros 145 |
Related eclipses
[edit]Eclipses in 1940
[edit]- 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
[edit]- Preceded by: Lunar eclipse of December 28, 1936
- Followed by: Lunar eclipse of August 4, 1944
Tzolkinex
[edit]- Preceded by: Lunar eclipse of September 4, 1933
- Followed by: Lunar eclipse of November 28, 1947
Half-Saros
[edit]- Preceded by: Solar eclipse of October 11, 1931
- Followed by: Solar eclipse of October 21, 1949
Tritos
[edit]- Preceded by: Lunar eclipse of November 17, 1929
- Followed by: Lunar eclipse of September 15, 1951
Lunar Saros 145
[edit]- Preceded by: Lunar eclipse of October 6, 1922
- Followed by: Lunar eclipse of October 27, 1958
Inex
[edit]- Preceded by: Lunar eclipse of November 6, 1911
- Followed by: Lunar eclipse of September 25, 1969
Triad
[edit]- Preceded by: Lunar eclipse of December 15, 1853
- Followed by: Lunar eclipse of August 17, 2027
Lunar eclipses of 1937–1940
[edit]| Ascending node | Descending node | |||||
|---|---|---|---|---|---|---|
| Saros | Date viewing |
Type chart |
Saros | Date viewing |
Type chart | |
| 110 | 1937 May 25
|
Penumbral
|
115 | 1937 Nov 18
|
Partial
| |
| 120 | 1938 May 14
|
Total
|
125 | 1938 Nov 07
|
Total
| |
| 130 | 1939 May 03
|
Total
|
135 | 1939 Oct 28
|
Partial
| |
| 140 | 1940 Apr 22
|
Penumbral
|
145 | 1940 Oct 16
|
Penumbral
| |
Half-Saros cycle
[edit]A lunar eclipse will be preceded and followed by solar eclipses by 9 years and 5.5 days (a half saros).[5] This lunar eclipse is related to two partial solar eclipses of Solar Saros 152.
| October 11, 1931 | October 21, 1949 |
|---|---|
|
|
See also
[edit]Notes
[edit]- ^ "October 15–16, 1940 Penumbral Lunar Eclipse". timeanddate. Retrieved 18 December 2024.
- ^ "Moon Distances for London, United Kingdom, England". timeanddate. Retrieved 18 December 2024.
- ^ "Penumbral Lunar Eclipse of 1940 Oct 16" (PDF). NASA. Retrieved 18 December 2024.
- ^ "Penumbral Lunar Eclipse of 1940 Oct 16". EclipseWise.com. Retrieved 18 December 2024.
- ^ Mathematical Astronomy Morsels, Jean Meeus, p.110, Chapter 18, The half-saros
External links
[edit]- 1940 Oct 16 chart Eclipse Predictions by Fred Espenak, NASA/GSFC
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