Partial Lunar Eclipse of 1923 Aug 26

Fred Espenak

Introduction


The Partial Lunar Eclipse of 1923 Aug 26 is visible from the following geographic regions:

  • eastern Asia, Australia, Americas

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 1923 Aug 26 at 10:39:51 TD (10:39:28 UT1). This is 5.6 days before the Moon reaches apogee. During the eclipse, the Moon is in the constellation Aquarius. The synodic month in which the eclipse takes place has a Brown Lunation Number of 8.

The eclipse belongs to Saros 117 and is number 47 of 71 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.

The partial lunar eclipse of 1923 Aug 26 is followed two weeks later by a total solar eclipse on 1923 Sep 10.

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 23.4 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 Partial Lunar Eclipse of 1923 Aug 26 .


Eclipse Data: Partial Lunar Eclipse of 1923 Aug 26

Eclipse Characteristics
Parameter Value
Penumbral Magnitude 1.20131
Umbral Magnitude 0.16344
Gamma 0.91331
Epsilon 0.8519°
Opposition Times
Event Calendar Date & Time Julian Date
Greatest Eclipse 1923 Aug 26 at 10:39:51.4 TD (10:39:28.1 UT1) 2423657.944075
Ecliptic Opposition 1923 Aug 26 at 10:29:34.2 TD (10:29:10.8 UT1) 2423657.936931
Equatorial Opposition 1923 Aug 26 at 11:08:27.7 TD (11:08:04.4 UT1) 2423657.963940
Geocentric Coordinates of Sun and Moon
1923 Aug 26 at 10:39:51.4 TD (10:39:28.1 UT1)
Coordinate Sun Moon
Right Ascension10h16m36.0s22h15m41.1s
Declination+10°42'30.2"-09°53'12.4"
Semi-Diameter 15'49.7" 15'15.0"
Eq. Hor. Parallax 08.7" 0°55'58.2"
Geocentric Libration of Moon
Angle Value
l 4.9°
b -1.1°
c -22.5°
Earth's Shadows
Parameter Value
Penumbral Radius 1.2084°
Umbral Radius 0.6808°
Prediction Paramaters
Paramater Value
Ephemerides JPL DE406
ΔT 23.4 s
Shadow Rule Danjon
Shadow Enlargement 1.010
Saros Series 117 (47/71)

Explanation of Lunar Eclipse Data Tables

Eclipse Contacts: Partial Lunar Eclipse of 1923 Aug 26

Lunar Eclipse Contacts
Eclipse Event Contact Time
TD
Time
UT1
Zenith Latitude Zenith Longitude Position Angle Axis Distance
Penumbral BeginsP108:14:24.008:14:00.710°14.0'S124°23.9'W 290.3° 1.4637°
Partial BeginsU109:52:38.009:52:14.610°00.0'S148°10.4'W 320.3° 0.9353°
Greatest EclipseGreatest10:39:51.410:39:28.109°53.2'S159°36.2'W 344.7° 0.8519°
Partial EndsU411:26:53.911:26:30.609°46.4'S170°59.4'W 8.9° 0.9346°
Penumbral EndsP413:05:16.413:04:53.109°32.2'S165°11.8'E 39.0° 1.4615°
Eclipse Durations
Eclipse Phase Duration
Penumbral (P4 - P1)04h50m52.4s
Partial (U4 - U1)01h34m15.9s

Explanation of Lunar Eclipse Contacts Table

Polynomial Besselian Elements: Partial Lunar Eclipse of 1923 Aug 26

Polynomial Besselian Elements
1923 Aug 26 at 11:00:00.0 TD (=t0)
n x y d f1 f2 f3
0 -0.06668 0.86508 0.1868 1.20828 0.68067 0.25415
1 0.47285 0.12978 -0.0003 -0.00035 -0.00036 -0.00010
2 -0.00021 -0.00003 -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 = 11.000

Explanation of Besselian Elements

Links for the Partial Lunar Eclipse of 1923 Aug 26

Links to Additional Lunar Eclipse Information

Eclipse Predictions

Predictions for the Partial Lunar Eclipse of 1923 Aug 26 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 23.4 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.