Penumbral Magnitude: 2.07253 (207.253%)

Umbral Magnitude: 1.11164 (111.164%)

Gamma: -0.41732

Epsilon: 0°25’24.96”

Greatest Eclipse = 1968 Apr 13 at 04:47:22.2 UTC

Ecliptic Opposition = 1968 Apr 13 at 04:51:39.2 UTC

Equatorial Opposition = 1968 Apr 13 at 05:09:48.0 UTC

Sun’s Equatorial Right Ascension = 1.439h

Sun’s Equatorial Declination = +9.06°

Sun’s Diameter = 1913.8 arcseconds

Sun’s Equatorial Horizontal Parallax = 17.6 arcseconds

Moon’s Equatorial Right Ascension = 13.426h

Moon’s Equatorial Declination = -9.44°

Moon’s Diameter = 1991.6 arcseconds

Moon’s Equatorial Horizontal Parallax = 7309.4 arcseconds

Earth’s Shadow’s Equatorial Right Ascension = 13.439h

Earth’s Shadow’s Equatorial Declination = -9.06°

Earth’s Penumbral Shadow’s Diameter = 9313.92 arcseconds

Earth’s Umbral Shadow’s Diameter = 5486.4 arcseconds

Saros 131 (31 of 72), Descending Node

Eclipse Contacts edit

P1: 1968 Apr 13 (Sat) at 02:12:33.3 UTC

U1: 1968 Apr 13 (Sat) at 03:10:18.4 UTC

U2: 1968 Apr 13 (Sat) at 04:23:07.6 UTC

Greatest: 1968 Apr 13 (Sat) at 04:47:22.2 UTC

U3: 1968 Apr 13 (Sat) at 05:11:38.3 UTC

U4: 1968 Apr 13 (Sat) at 06:24:28.0 UTC

P4: 1968 Apr 13 (Sat) at 07:22:09.1 UTC

Eclipse Durations edit

The total duration of the eclipse was 5 hours, 9 minutes and 35.8 seconds.

The duration of the partial phases was 2 hours, 25 minutes and 38.9 seconds.

The duration of totality was 48 minutes and 30.7 seconds.

It was visible from North and South America, as well as Africa and western Europe.

Lunar year series edit

Saros series edit

It is the second total lunar eclipse of the series.

Lunar Saros series 131, has 72 lunar eclipses. Solar Saros 138 interleaves with this lunar saros with an event occurring every 9 years 5 days alternating between each saros series.

This eclipse series began in AD 1427 with a partial eclipse at the southern edge of the Earth's shadow when the Moon was close to its descending node. Each successive Saros cycle, the Moon's orbital path is shifted northward with respect to the Earth's shadow, with the first total eclipse occurring in 1950. For the following 252 years, total eclipses occur, with the central eclipse being predicted to occur in 2078. The first partial eclipse after this is predicted to occur in the year 2220, and the final partial eclipse of the series will occur in 2707. The total lifetime of the lunar Saros series 131 is 1280 years. Solar Saros 138 interleaves with this lunar saros with an event occurring every 9 years 5 days alternating between each saros series.

Because of the ⅓ fraction of days in a Saros cycle, the visibility of each eclipse will differ for an observer at a given fixed locale. For the lunar Saros series 131, the first total eclipse of 1950 had its best visibility for viewers in Eastern Europe and the Middle East because mid-eclipse was at 20:44 UT. The following eclipse in the series occurred approximately 8 hours later in the day with mid-eclipse at 4:47 UT, and was best seen from North America and South America. The third total eclipse occurred approximately 8 hours later in the day than the second eclipse with mid-eclipse at 12:43 UT, and had its best visibility for viewers in the Western Pacific, East Asia, Australia and New Zealand. This cycle of visibility repeats from the initiation to termination of the series, with minor variations. Solar Saros 138 interleaves with this lunar saros with an event occurring every 9 years 5 days alternating between each saros series.

Lunar Saros series 131, repeating every 18 years and 11 days, has a total of 72 lunar eclipse events including 57 umbral lunar eclipses (42 partial lunar eclipses and 15 total lunar eclipses). Solar Saros 138 interleaves with this lunar saros with an event occurring every 9 years 5 days alternating between each saros series.

Inex series edit

The inex series repeats eclipses 20 days short of 29 years, repeating on average every 10571.95 days. This period is equal to 358 lunations (synodic months) and 388.5 draconic months. Saros series increment by one on successive Inex events and repeat at alternate ascending and descending lunar nodes.

This period is 383.6734 anomalistic months (the period of the Moon's elliptical orbital precession). Despite the average 0.05 time-of-day shift between subsequent events, the variation of the Moon in its elliptical orbit at each event causes the actual eclipse time to vary significantly. It is a part of Lunar Inex series 35.

Half-Saros cycle edit

A lunar eclipse will be preceded and followed by solar eclipses by 9 years and 5.5 days (a half saros).^[2] This lunar eclipse is related to two annular solar eclipses of Solar Saros 138.

• List of lunar eclipses
• List of 20th-century lunar eclipses

• 1968 Apr 13 chart Eclipse Predictions by Fred Espenak, NASA/GSFC