Total Lunar Eclipse of 1917 Jan 08

Fred Espenak

Introduction


The Total Lunar Eclipse of 1917 Jan 08 is visible from the following geographic regions:

  • eastern Asia, eastern Australia, 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 1917 Jan 08 at 07:44:48 TD (07:44:29 UT1). This is 2.0 days before the Moon reaches apogee. During the eclipse, the Moon is in the constellation Gemini. The synodic month in which the eclipse takes place has a Brown Lunation Number of -74.

The eclipse belongs to Saros 123 and is number 47 of 72 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 total eclipse is central meaning the Moon’s disk actually passes through the axis of Earth’s umbral shadow. It has an umbral eclipse magnitude of 1.3642, and Gamma has a value of 0.2415. Because they are so deep, such eclipses typically have the longest total phases. In this case, the duration of totality lasts 87.6 minutes.

The total lunar eclipse of 1917 Jan 08 is preceded two weeks earlier by a partial solar eclipse on 1916 Dec 24, and it is followed two weeks later by a partial solar eclipse on 1917 Jan 23.

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 19.3 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 Total Lunar Eclipse of 1917 Jan 08 .


Eclipse Data: Total Lunar Eclipse of 1917 Jan 08

Eclipse Characteristics
Parameter Value
Penumbral Magnitude 2.46628
Umbral Magnitude 1.36417
Gamma 0.24154
Epsilon 0.2180°
Opposition Times
Event Calendar Date & Time Julian Date
Greatest Eclipse 1917 Jan 08 at 07:44:48.4 TD (07:44:29.1 UT1) 2421236.822559
Ecliptic Opposition 1917 Jan 08 at 07:41:53.8 TD (07:41:34.5 UT1) 2421236.820539
Equatorial Opposition 1917 Jan 08 at 07:38:03.4 TD (07:37:44.1 UT1) 2421236.817872
Geocentric Coordinates of Sun and Moon
1917 Jan 08 at 07:44:48.4 TD (07:44:29.1 UT1)
Coordinate Sun Moon
Right Ascension19h15m48.8s07h16m01.8s
Declination-22°18'25.3"+22°31'09.3"
Semi-Diameter 16'15.9" 14'45.5"
Eq. Hor. Parallax 08.9" 0°54'09.7"
Geocentric Libration of Moon
Angle Value
l 1.8°
b -0.3°
c 5.9°
Earth's Shadows
Parameter Value
Penumbral Radius 1.1853°
Umbral Radius 0.6431°
Prediction Paramaters
Paramater Value
Ephemerides JPL DE406
ΔT 19.3 s
Shadow Rule Danjon
Shadow Enlargement 1.010
Saros Series 123 (47/72)

Explanation of Lunar Eclipse Data Tables

Eclipse Contacts: Total Lunar Eclipse of 1917 Jan 08

Lunar Eclipse Contacts
Eclipse Event Contact Time
TD
Time
UT1
Zenith Latitude Zenith Longitude Position Angle Axis Distance
Penumbral BeginsP104:38:14.804:37:55.522°51.1'N069°16.1'W 291.9° 1.4318°
Partial BeginsU105:51:06.805:50:47.522°43.4'N086°53.7'W 297.4° 0.8894°
Total BeginsU207:01:01.107:00:41.822°35.9'N103°48.3'W 316.5° 0.3972°
Greatest EclipseGreatest07:44:48.407:44:29.122°31.2'N114°24.0'W 13.2° 0.2180°
Total EndsU308:28:35.108:28:15.822°26.3'N124°59.5'W 69.9° 0.3971°
Partial EndsU409:38:29.009:38:09.722°18.5'N141°54.2'W 89.0° 0.8888°
Penumbral EndsP410:51:24.510:51:05.222°10.2'N159°33.0'W 94.5° 1.4308°
Eclipse Durations
Eclipse Phase Duration
Penumbral (P4 - P1)06h13m09.7s
Partial (U4 - U1)03h47m22.2s
Total (U3 - U2)01h27m34.0s

Explanation of Lunar Eclipse Contacts Table

Polynomial Besselian Elements: Total Lunar Eclipse of 1917 Jan 08

Polynomial Besselian Elements
1917 Jan 08 at 08:00:00.0 TD (=t0)
n x y d f1 f2 f3
0 0.16200 0.18590 -0.3893 1.18527 0.64310 0.24596
1 0.44291 -0.10407 0.0001 -0.00012 -0.00012 -0.00003
2 -0.00010 -0.00013 0.0000 0.00000 0.00000 0.00000
3 -0.00000 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 = 8.000

Explanation of Besselian Elements

Links for the Total Lunar Eclipse of 1917 Jan 08

Links to Additional Lunar Eclipse Information

Eclipse Predictions

Predictions for the Total Lunar Eclipse of 1917 Jan 08 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 19.3 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.