Solar Eclipse Prime Page

Partial Solar Eclipse of 1931 Sep 12

Fred Espenak

Key to Solar Eclipse Figure (below)

Introduction

The Partial Solar Eclipse of 1931 Sep 12 is visible from the following geographic regions:

  • Partial Eclipse: Russia, Alaska

The map to the right depicts the geographic regions of eclipse visibility. Click on the map to enlarge it. For an explanation of the features appearing in the map, see Key to Solar Eclipse Maps.

The instant of greatest eclipse takes place on 1931 Sep 12 at 04:41:25 TD (04:41:01 UT1). This is 0.5 days before the Moon reaches perigee. During the eclipse, the Sun is in the constellation Leo. The synodic month in which the eclipse takes place has a Brown Lunation Number of 108.

The eclipse belongs to Saros 114 and is number 72 of 72 eclipses in the series. Thus, the 1931 Sep 12 event is the last eclipse of the series . All eclipses in this series occur at the Moon’s descending node. The Moon moves northward with respect to the node with each succeeding eclipse in the series and gamma increases.

This is an extremely shallow partial eclipse. It has an eclipse magnitude of only 0.0471, while Gamma has a value of 1.5060. This is a very deep partial eclipse. It has an eclipse magnitude of 0.0471, while Gamma has a value of 1.5060.

The partial solar eclipse of 1931 Sep 12 is followed two weeks later by a total lunar eclipse on 1931 Sep 26.

Another solar eclipse occurs one synodic month after the 1931 Sep 12 eclipse. It is the partial solar eclipse of 1931 Oct 11.

These eclipses all take place during a single eclipse season.

The eclipse predictions are given in both Terrestrial Dynamical Time (TD) and Universal Time (UT1). The parameter ΔT is used to convert between these two times (i.e., UT1 = TD - ΔT). ΔT has a value of 23.9 seconds for this eclipse.

The following links provide maps and data for the eclipse.

Eclipse Data: Partial Solar Eclipse of 1931 Sep 12

Eclipse Characteristics
Parameter Value
Eclipse Magnitude 0.04713
Eclipse Obscuration 0.01234
Gamma 1.50603
Conjunction Times
Event Calendar Date and Time Julian Date
Greatest Eclipse 1931 Sep 12 at 04:41:24.8 TD (04:41:00.9 UT1) 2426596.695149
Ecliptic Conjunction 1931 Sep 12 at 04:26:43.8 TD (04:26:19.9 UT1) 2426596.684952
Equatorial Conjunction 1931 Sep 12 at 03:17:27.4 TD (03:17:03.5 UT1) 2426596.636846
Geocentric Coordinates of Sun and Moon
1931 Sep 12 at 04:41:24.8 TD (04:41:00.9 UT1)
Coordinate Sun Moon
Right Ascension11h17m33.8s11h20m30.0s
Declination+04°33'58.3"+05°54'53.5"
Semi-Diameter 15'53.5" 16'41.5"
Eq. Hor. Parallax 08.7" 1°01'15.6"
Geocentric Libration of Moon
Angle Value
l -0.9°
b -2.0°
c 21.6°
Prediction Parameters
Paramater Value
Ephemerides JPL DE405
ΔT 23.9 s
k (penumbra) 0.2725076
k (umbra) 0.2722810
Saros Series 114 (72/72)

Explanation of Solar Eclipse Data Tables

Penumbral Shadow Contacts and Extremes: Partial Solar Eclipse of 1931 Sep 12

Contacts of Penumbral Shadow with Earth
Contact Event Contact Time
TD		 Time
UT1		 Latitude Longitude
First External ContactP104:13:32.804:13:08.971°19.2'N140°27.0'W
Last External ContactP405:09:49.805:09:25.951°08.7'N162°31.4'W
Extreme Northern and Southern Path Limits of Penumbra
Contact Event Contact Time
TD		 Time
UT1		 Latitude Longitude
North Extreme Path Limit 1N104:18:37.304:18:13.473°38.2'N139°36.1'W
South Extreme Path Limit 1S105:04:51.505:04:27.648°39.1'N161°45.6'W

Explanation of Penumbral Shadow Contacts and Extremes Tables

Polynomial Besselian Elements: Partial Solar Eclipse of 1931 Sep 12

Polynomial Besselian Elements
1931 Sep 12 at 05:00:00.0 TD (=t0)
n x y d l1 l2 μ
0 0.87576 1.23843 4.5583 0.53311 -0.01298 255.8422
1 0.51235 -0.27747 -0.0152 -0.00004 -0.00004 15.0049
2 -0.00006 -0.00010 -0.0000 -0.00001 -0.00001 0.0000
3 -0.00001 0.00000 - - - -
Tan ƒ1 0.0046454
Tan ƒ2 0.0046222

At time t1 (decimal hours), each besselian element is evaluated by:

x = x0 + x1*t + x2*t2 + x3*t3 (or x = Σ [xn*tn]; n = 0 to 3)

where: t = t1 - t0 (decimal hours) and t0 = 5.000

Explanation of Polynomial Besselian Elements

Eclipse Publications

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For more visit: AstroPixels Publishing

Links for the Partial Solar Eclipse of 1931 Sep 12

Links to Additional Solar Eclipse Information

  • Home - home page of EclipseWise with predictions for both solar and lunar eclipses

• Decade Tables of Solar Eclipses:
| 1901 - 1910 | 1911 - 1919 | 1921 - 1930 | 1931 - 1940 | 1941 - 1950 |
| 1951 - 1960 | 1961 - 1970 | 1971 - 1980 | 1981 - 1990 | 1991 - 2000 |
| 2001 - 2010 | 2011 - 2020 | 2021 - 2030 | 2031 - 2040 | 2041 - 2050 |
| 2051 - 2060 | 2061 - 2070 | 2071 - 2080 | 2081 - 2090 | 2091 - 2100 |

Solar Eclipse Publications

Eclipse Publications

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jpeg jpeg
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For more visit: AstroPixels Publishing

Eclipse Predictions

Predictions for the Partial Solar Eclipse of 1931 Sep 12 were generated using the JPL DE405 solar and lunar ephemerides. The lunar coordinates were calculated with respect to the Moon's Center of Mass. The predictions are given in both Terrestrial Dynamical Time (TD) and Universal Time (UT1). The parameter ΔT is used to convert between these two times (i.e., UT1 = TD - ΔT). ΔT has a value of 23.9 seconds for this eclipse.

Acknowledgments

Some of the content on this website is based on the books 21st Century Canon of Solar Eclipses and Thousand Year Canon of Solar Eclipses 1501 to 2500. All eclipse calculations are by Fred Espenak, and he assumes full responsibility for their accuracy.

Permission is granted to reproduce eclipse data when accompanied by a link to this page and an acknowledgment:

"Eclipse Predictions by Fred Espenak, www.EclipseWise.com"

The use of diagrams and maps is permitted provided that they are NOT altered (except for re-sizing) and the embedded credit line is NOT removed or concealed.