Penumbral Lunar Eclipse of 1969 Aug 27

Fred Espenak

Introduction


The Penumbral Lunar Eclipse of 1969 Aug 27 is visible from the following geographic regions:

  • eastern Asia, Australia, western 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 1969 Aug 27 at 10:48:17 TD (10:47:38 UT1). This is 1.8 days after the Moon reaches perigee. 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 577.

The eclipse belongs to Saros 108 and is number 72 of 72 eclipses in the series. Thus, the 1969 Aug 27 event is the last eclipse of 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.

This is a very shallow penumbral eclipse. It has a penumbral eclipse magnitude of only 0.0134 and a penumbral eclipse duration of 31.5 minutes. Gamma has a value of -1.5407.

The penumbral lunar eclipse of 1969 Aug 27 is followed two weeks later by a annular solar eclipse on 1969 Sep 11.

Another lunar eclipse occurs one synodic month after the 1969 Aug 27 eclipse. It is the penumbral lunar eclipse of 1969 Sep 25.

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 39.8 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 1969 Aug 27 .


Eclipse Data: Penumbral Lunar Eclipse of 1969 Aug 27

Eclipse Characteristics
Parameter Value
Penumbral Magnitude 0.01337
Umbral Magnitude-0.95141
Gamma-1.54066
Epsilon 1.5464°
Opposition Times
Event Calendar Date & Time Julian Date
Greatest Eclipse 1969 Aug 27 at 10:48:17.4 TD (10:47:37.5 UT1) 2440460.949740
Ecliptic Opposition 1969 Aug 27 at 10:33:02.6 TD (10:32:22.8 UT1) 2440460.939153
Equatorial Opposition 1969 Aug 27 at 09:27:02.4 TD (09:26:22.6 UT1) 2440460.893317
Geocentric Coordinates of Sun and Moon
1969 Aug 27 at 10:48:17.4 TD (10:47:37.5 UT1)
Coordinate Sun Moon
Right Ascension10h23m30.2s22h26m20.1s
Declination+10°03'05.7"-11°25'58.1"
Semi-Diameter 15'50.0" 16'24.7"
Eq. Hor. Parallax 08.7" 1°00'13.8"
Geocentric Libration of Moon
Angle Value
l 3.7°
b 2.0°
c -20.0°
Earth's Shadows
Parameter Value
Penumbral Radius 1.2802°
Umbral Radius 0.7524°
Prediction Paramaters
Paramater Value
Ephemerides JPL DE406
ΔT 39.8 s
Shadow Rule Danjon
Shadow Enlargement 1.010
Saros Series 108 (72/72)

Explanation of Lunar Eclipse Data Tables

Eclipse Contacts: Penumbral Lunar Eclipse of 1969 Aug 27

Lunar Eclipse Contacts
Eclipse Event Contact Time
TD
Time
UT1
Zenith Latitude Zenith Longitude Position Angle Axis Distance
Penumbral BeginsP110:32:24.110:31:44.311°30.3'S156°59.0'W 158.9° 1.5538°
Greatest EclipseGreatest10:48:17.410:47:37.511°26.0'S160°49.1'W 153.3° 1.5464°
Penumbral EndsP411:03:56.611:03:16.711°21.7'S164°35.8'W 147.8° 1.5536°
Eclipse Durations
Eclipse Phase Duration
Penumbral (P4 - P1)00h31m32.4s

Explanation of Lunar Eclipse Contacts Table

Polynomial Besselian Elements: Penumbral Lunar Eclipse of 1969 Aug 27

Polynomial Besselian Elements
1969 Aug 27 at 11:00:00.0 TD (=t0)
n x y d f1 f2 f3
0 0.79405 -1.33163 0.1754 1.28010 0.75233 0.27350
1 0.51214 0.25731 -0.0003 -0.00033 -0.00034 -0.00009
2 -0.00026 0.00005 -0.0000 -0.00000 -0.00000 -0.00000
3 -0.00001 -0.00001 - - - -

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 Penumbral Lunar Eclipse of 1969 Aug 27

Links to Additional Lunar Eclipse Information

Eclipse Predictions

Predictions for the Penumbral Lunar Eclipse of 1969 Aug 27 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 39.8 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.