Solar Eclipse Prime Page

Total Solar Eclipse of 1939 Oct 12

Fred Espenak

Key to Solar Eclipse Figure (below)

Introduction


The Total Solar Eclipse of 1939 Oct 12 is visible from the following geographic regions:

  • Partial Eclipse: Antarctica, Australia, south South America, New Zealand
  • Total Eclipse: Antarctica

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 1939 Oct 12 at 20:40:23 TD (20:39:59 UT1). This is 1.8 days after the Moon reaches perigee. During the eclipse, the Sun is in the constellation Virgo. The synodic month in which the eclipse takes place has a Brown Lunation Number of 208.

The eclipse belongs to Saros 123 and is number 49 of 70 eclipses in the series. All eclipses in this series occur at the Moon’s ascending node. The Moon moves southward with respect to the node with each succeeding eclipse in the series and gamma decreases.

The total solar eclipse of 1939 Oct 12 is followed two weeks later by a partial lunar eclipse on 1939 Oct 28.

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 24.3 seconds for this eclipse.

The following links provide maps and data for the eclipse.

Eclipse Data: Total Solar Eclipse of 1939 Oct 12

Eclipse Characteristics
Parameter Value
Eclipse Magnitude 1.02657
Eclipse Obscuration 1.05385
Gamma-0.97370
Conjunction Times
Event Calendar Date and Time Julian Date
Greatest Eclipse 1939 Oct 12 at 20:40:23.4 TD (20:39:59.1 UT1) 2429549.361101
Ecliptic Conjunction 1939 Oct 12 at 20:30:28.6 TD (20:30:04.4 UT1) 2429549.354217
Equatorial Conjunction 1939 Oct 12 at 21:11:17.5 TD (21:10:53.2 UT1) 2429549.382561
Geocentric Coordinates of Sun and Moon
1939 Oct 12 at 20:40:23.4 TD (20:39:59.1 UT1)
Coordinate Sun Moon
Right Ascension13h08m41.4s13h07m33.1s
Declination-07°17'47.8"-08°13'46.1"
Semi-Diameter 16'01.7" 16'24.2"
Eq. Hor. Parallax 08.8" 1°00'12.1"
Geocentric Libration of Moon
Angle Value
l 3.7°
b 1.3°
c 23.9°
Prediction Parameters
Paramater Value
Ephemerides JPL DE405
ΔT 24.3 s
k (penumbra) 0.2725076
k (umbra) 0.2722810
Saros Series 123 (49/70)

Explanation of Solar Eclipse Data Tables

Penumbral Shadow Contacts and Extremes: Total Solar Eclipse of 1939 Oct 12

Contacts of Penumbral Shadow with Earth
Contact Event Contact Time
TD
Time
UT1
Latitude Longitude
First External ContactP118:35:06.118:34:41.822°21.0'S164°59.1'E
Last External ContactP422:45:29.822:45:05.655°33.1'S063°49.5'W
Extreme Northern and Southern Path Limits of Penumbra
Contact Event Contact Time
TD
Time
UT1
Latitude Longitude
North Extreme Path Limit 1N119:02:45.019:02:20.708°55.2'S159°55.6'E
South Extreme Path Limit 1S122:17:53.322:17:29.042°20.0'S061°00.2'W

Explanation of Penumbral Shadow Contacts and Extremes Tables

Umbral Shadow Contacts and Extremes: Total Solar Eclipse of 1939 Oct 12

Contacts of Umbral Shadow with Earth
Contact Event Contact Time
TD
Time
UT1
Latitude Longitude
First External ContactU120:14:48.520:14:24.258°32.6'S130°59.3'E
First Internal ContactU220:20:50.720:20:26.561°39.0'S127°49.9'E
Last Internal ContactU320:59:35.320:59:11.080°28.4'S082°06.5'E
Last External ContactU421:05:33.921:05:09.682°07.4'S062°31.6'E
Extreme Northern and Southern Path Limits of Umbra
Contact Event Contact Time
TD
Time
UT1
Latitude Longitude
North Extreme Path Limit 1N120:14:52.720:14:28.458°30.1'S130°59.5'E
South Extreme Path Limit 1S120:20:47.620:20:23.361°41.0'S127°49.5'E
North Extreme Path Limit 2N221:05:29.821:05:05.582°08.4'S062°15.8'E
South Extreme Path Limit 2S220:59:38.520:59:14.280°27.1'S082°14.6'E

Explanation of Umbral Shadow Contacts and Extremes Tables

Central Line Extremes and Duration: Total Solar Eclipse of 1939 Oct 12

Extreme Limits of the Central Line
Contact Event Contact Time
TD
Time
UT1
Latitude Longitude
Extreme Central Line Limit 1C120:17:38.120:17:13.959°59.5'S129°33.2'E
Extreme Central Line Limit 2C221:02:46.121:02:21.881°27.7'S072°29.4'E

Explanation of Central Line Extremes Table

Greatest Eclipse and Greatest Duration
Event Time
TD
Time
UT1
Latitude Longitude Sun
Altitude
Sun
Azimuth
Path Width Central
Duration
Greatest Eclipse20:40:23.420:39:59.172°47.2'S155°06.2'E 12.4° 74.4° 417.6 km01m32.43s
Greatest Duration20:39:46.320:39:22.172°27.8'S154°57.2'E 12.4° 74.8° 419.0 km01m32.44s

Explanation of Greatest Eclipse and Greatest Duration

Polynomial Besselian Elements: Total Solar Eclipse of 1939 Oct 12

Polynomial Besselian Elements
1939 Oct 12 at 21:00:00.0 TD (=t0)
n x y d l1 l2 μ
0 -0.10289 -0.98607 -7.2993 0.54009 -0.00604 138.3473
1 0.54675 -0.16511 -0.0153 0.00008 0.00008 15.0039
2 0.00001 0.00010 0.0000 -0.00001 -0.00001 -0.0000
3 -0.00001 0.00000 - - - -
Tan ƒ1 0.0046857
Tan ƒ2 0.0046623

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 = 21.000

Explanation of Polynomial Besselian Elements

Eclipse Publications

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For more visit: AstroPixels Publishing

Links for the Total Solar Eclipse of 1939 Oct 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 Total Solar Eclipse of 1939 Oct 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 24.3 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.