Penumbral Lunar Eclipse of 1915 Jan 31

Fred Espenak

Introduction


The Penumbral Lunar Eclipse of 1915 Jan 31 is visible from the following geographic regions:

  • Americas, Europe, western Africa

The diagram to the right depicts the Moon's path with respect to Earth's umbral and penumbral shadows. Below it is a map showing the geographic regions of eclipse visibility. Click on the figure to enlarge it. For an explanation of the features appearing in the figure, see Key to Lunar Eclipse Figures.

The instant of greatest eclipse takes place on 1915 Jan 31 at 04:57:45 TD (04:57:28 UT1). This is 6.8 days after the Moon reaches apogee. During the eclipse, the Moon is in the constellation Cancer. The synodic month in which the eclipse takes place has a Brown Lunation Number of -98.

The eclipse belongs to Saros 103 and is number 81 of 82 eclipses in 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 a very shallow penumbral eclipse. It has a penumbral eclipse magnitude of only 0.0453 and a penumbral eclipse duration of 62.1 minutes. Gamma has a value of 1.5450.

The penumbral lunar eclipse of 1915 Jan 31 is followed two weeks later by a annular solar eclipse on 1915 Feb 14.

Another lunar eclipse occurs one synodic month after the 1915 Jan 31 eclipse. It is the penumbral lunar eclipse of 1915 Mar 01.

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., TD = UT1 + ΔT). ΔT has a value of 17.2 seconds for this eclipse.

The following links provide maps and data for the eclipse.

The tables below contain detailed predictions and additional information on the Penumbral Lunar Eclipse of 1915 Jan 31 .


Eclipse Data: Penumbral Lunar Eclipse of 1915 Jan 31

Eclipse Characteristics
Parameter Value
Penumbral Magnitude 0.04527
Umbral Magnitude-0.99871
Gamma 1.54505
Epsilon 1.4694°
Opposition Times
Event Calendar Date & Time Julian Date
Greatest Eclipse 1915 Jan 31 at 04:57:44.7 TD (04:57:27.6 UT1) 2420528.706569
Ecliptic Opposition 1915 Jan 31 at 04:41:10.8 TD (04:40:53.7 UT1) 2420528.695065
Equatorial Opposition 1915 Jan 31 at 03:50:55.0 TD (03:50:37.8 UT1) 2420528.660160
Geocentric Coordinates of Sun and Moon
1915 Jan 31 at 04:57:44.7 TD (04:57:27.6 UT1)
Coordinate Sun Moon
Right Ascension20h50m47.5s08h53m01.9s
Declination-17°41'02.8"+19°03'14.9"
Semi-Diameter 16'14.0" 15'33.0"
Eq. Hor. Parallax 08.9" 0°57'04.2"
Geocentric Libration of Moon
Angle Value
l -4.9°
b -1.9°
c 14.4°
Earth's Shadows
Parameter Value
Penumbral Radius 1.2337°
Umbral Radius 0.6926°
Prediction Paramaters
Paramater Value
Ephemerides JPL DE406
ΔT 17.2 s
Shadow Rule Danjon
Shadow Enlargement 1.010
Saros Series 103 (81/82)

Explanation of Lunar Eclipse Data Tables

Eclipse Contacts: Penumbral Lunar Eclipse of 1915 Jan 31

Lunar Eclipse Contacts
Eclipse Event Contact Time
TD
Time
UT1
Zenith Latitude Zenith Longitude Position Angle Axis Distance
Penumbral BeginsP104:26:51.404:26:34.219°09.3'N062°58.6'W 11.0° 1.4926°
Greatest EclipseGreatest04:57:44.704:57:27.619°03.2'N070°26.4'W 21.1° 1.4694°
Penumbral EndsP405:28:58.405:28:41.218°57.1'N077°59.1'W 31.4° 1.4932°
Eclipse Durations
Eclipse Phase Duration
Penumbral (P4 - P1)01h02m07.0s

Explanation of Lunar Eclipse Contacts Table

Polynomial Besselian Elements: Penumbral Lunar Eclipse of 1915 Jan 31

Polynomial Besselian Elements
1915 Jan 31 at 05:00:00.0 TD (=t0)
n x y d f1 f2 f3
0 0.54745 1.36377 -0.3086 1.23373 0.69260 0.25917
1 0.47564 -0.18378 0.0002 0.00040 0.00041 0.00011
2 0.00015 -0.00025 0.0000 -0.00000 -0.00000 -0.00000
3 -0.00001 0.00000 - - - -

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 Besselian Elements

Links for the Penumbral Lunar Eclipse of 1915 Jan 31

Links to Additional Lunar Eclipse Information

Eclipse Predictions

Predictions for the Penumbral Lunar Eclipse of 1915 Jan 31 were generated using the JPL DE406 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 17.2 seconds for this eclipse.

Acknowledgments

Some of the content on this web site is based on the book Thousand Year Canon of Lunar 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 covered.