Total Lunar Eclipse of 1968 Apr 13

Fred Espenak

Introduction


The Total Lunar Eclipse of 1968 Apr 13 is visible from the following geographic regions:

  • Americas, Europe, 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 1968 Apr 13 at 04:48:01 TD (04:47:22 UT1). This is 1.1 days before the Moon reaches perigee. During the eclipse, the Moon is in the constellation Virgo. The synodic month in which the eclipse takes place has a Brown Lunation Number of 560.

The eclipse belongs to Saros 131 and is number 31 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.

The total lunar eclipse of 1968 Apr 13 is preceded two weeks earlier by a partial solar eclipse on 1968 Mar 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., TD = UT1 + ΔT). ΔT has a value of 38.5 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 1968 Apr 13 .


Eclipse Data: Total Lunar Eclipse of 1968 Apr 13

Eclipse Characteristics
Parameter Value
Penumbral Magnitude 2.07253
Umbral Magnitude 1.11164
Gamma-0.41732
Epsilon 0.4236°
Opposition Times
Event Calendar Date & Time Julian Date
Greatest Eclipse 1968 Apr 13 at 04:48:00.8 TD (04:47:22.2 UT1) 2439959.699563
Ecliptic Opposition 1968 Apr 13 at 04:52:17.8 TD (04:51:39.2 UT1) 2439959.702537
Equatorial Opposition 1968 Apr 13 at 05:10:26.5 TD (05:09:48.0 UT1) 2439959.715139
Geocentric Coordinates of Sun and Moon
1968 Apr 13 at 04:48:00.8 TD (04:47:22.2 UT1)
Coordinate Sun Moon
Right Ascension01h26m19.6s13h25m32.2s
Declination+09°03'48.7"-09°26'23.0"
Semi-Diameter 15'56.9" 16'35.8"
Eq. Hor. Parallax 08.8" 1°00'54.7"
Geocentric Libration of Moon
Angle Value
l -2.6°
b 0.6°
c 20.2°
Earth's Shadows
Parameter Value
Penumbral Radius 1.2936°
Umbral Radius 0.7620°
Prediction Paramaters
Paramater Value
Ephemerides JPL DE406
ΔT 38.5 s
Shadow Rule Danjon
Shadow Enlargement 1.010
Saros Series 131 (31/72)

Explanation of Lunar Eclipse Data Tables

Eclipse Contacts: Total Lunar Eclipse of 1968 Apr 13

Lunar Eclipse Contacts
Eclipse Event Contact Time
TD
Time
UT1
Zenith Latitude Zenith Longitude Position Angle Axis Distance
Penumbral BeginsP102:13:11.802:12:33.308°42.2'S034°32.7'W 281.7° 1.5694°
Partial BeginsU103:10:56.903:10:18.408°58.7'S048°28.8'W 273.3° 1.0381°
Total BeginsU204:23:46.204:23:07.609°19.5'S066°03.0'W 236.6° 0.4853°
Greatest EclipseGreatest04:48:00.804:47:22.209°26.4'S071°53.9'W 207.4° 0.4236°
Total EndsU305:12:16.805:11:38.309°33.3'S077°45.2'W 178.1° 0.4854°
Partial EndsU406:25:06.506:24:28.009°54.0'S095°19.3'W 141.4° 1.0391°
Penumbral EndsP407:22:47.607:22:09.110°10.3'S109°14.1'W 133.0° 1.5709°
Eclipse Durations
Eclipse Phase Duration
Penumbral (P4 - P1)05h09m35.8s
Partial (U4 - U1)03h14m09.6s
Total (U3 - U2)00h48m30.7s

Explanation of Lunar Eclipse Contacts Table

Polynomial Besselian Elements: Total Lunar Eclipse of 1968 Apr 13

Polynomial Besselian Elements
1968 Apr 13 at 05:00:00.0 TD (=t0)
n x y d f1 f2 f3
0 -0.09062 -0.43005 0.1582 1.29362 0.76203 0.27663
1 0.52069 -0.26934 0.0003 0.00023 0.00024 0.00006
2 0.00016 0.00002 -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 = 5.000

Explanation of Besselian Elements

Links for the Total Lunar Eclipse of 1968 Apr 13

Links to Additional Lunar Eclipse Information

Eclipse Predictions

Predictions for the Total Lunar Eclipse of 1968 Apr 13 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 38.5 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.