Solar Eclipse Prime Page

Annular Solar Eclipse of 1961 Aug 11

Fred Espenak

Introduction


The Annular Solar Eclipse of 1961 Aug 11 is visible from the following geographic regions:

  • Partial Eclipse: Brazil, south Atlantic, south Africa, Antarctica
  • Annular Eclipse: Antarctica

The map to the right depicts the geographic regions of eclipse visibility. Click on the map to enlarge it. For an explanation of the features appearing in the map, see Key to Solar Eclipse Maps.

The instant of greatest eclipse takes place on 1961 Aug 11 at 10:46:47 TD (10:46:13 UT1). This is 0.3 days before the Moon reaches apogee. During the eclipse, the Sun is in the constellation Leo. The synodic month in which the eclipse takes place has a Brown Lunation Number of 478.

The eclipse belongs to Saros 125 and is number 51 of 73 eclipses in 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.

The solar eclipse of 1961 Aug 11 is a relatively long annular eclipse with a duration at greatest eclipse of 06m35s. It has an eclipse magnitude of 0.9375.

The annular solar eclipse of 1961 Aug 11 is followed two weeks later by a partial lunar eclipse on 1961 Aug 26.

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., UT1 = TD - ΔT). ΔT has a value of 33.8 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 Annular Solar Eclipse of 1961 Aug 11 .


Eclipse Data: Annular Solar Eclipse of 1961 Aug 11

Eclipse Characteristics
Parameter Value
Eclipse Magnitude 0.93753
Eclipse Obscuration 0.87897
Gamma-0.88594
Conjunction Times
Event Calendar Date & Time Julian Date
Greatest Eclipse 1961 Aug 11 at 10:46:46.9 TD (10:46:13.1 UT1) 2437522.948763
Ecliptic Conjunction 1961 Aug 11 at 10:36:17.9 TD (10:35:44.0 UT1) 2437522.941482
Equatorial Conjunction 1961 Aug 11 at 11:09:44.1 TD (11:09:10.3 UT1) 2437522.964702
Geocentric Coordinates of Sun and Moon
1961 Aug 11 at 10:46:46.9 TD (10:46:13.1 UT1)
Coordinate Sun Moon
Right Ascension09h23m48.0s09h23m06.0s
Declination+15°16'44.3"+14°30'09.9"
Semi-Diameter 15'46.9" 14'41.9"
Eq. Hor. Parallax 08.7" 0°53'56.8"
Geocentric Libration of Moon
Angle Value
l 0.4°
b 1.1°
c 19.5°
Prediction Paramaters
Paramater Value
Ephemerides JPL DE406
ΔT 33.8 s
k (penumbra) 0.2725076
k (umbra) 0.2722810
Saros Series 125 (51/73)

Explanation of Solar Eclipse Data Tables

Penumbral Shadow Contacts and Extremes: Annular Solar Eclipse of 1961 Aug 11

Contacts of Penumbral Shadow with Earth
Contact Event Contact Time
TD
Time
UT1
Latitude Longitude
First External ContactP108:13:26.208:12:52.321°27.3'S025°44.6'W
Last External ContactP413:19:57.613:19:23.844°51.7'S055°41.4'E
Extreme Northern and Southern Path Limits of Penumbra
Contact Event Contact Time
TD
Time
UT1
Latitude Longitude
North Extreme Path Limit 1N109:03:21.009:02:47.206°26.2'S042°38.0'W
South Extreme Path Limit 1S112:30:07.612:29:33.830°11.5'S074°45.6'E

Explanation of Penumbral Shadow Contacts and Extremes Tables

Umbral Shadow Contacts and Extremes: Annular Solar Eclipse of 1961 Aug 11

Contacts of Umbral Shadow with Earth
Contact Event Contact Time
TD
Time
UT1
Latitude Longitude
First External ContactU109:47:06.309:46:32.546°04.9'S038°50.7'W
First Internal ContactU209:57:40.309:57:06.450°14.8'S038°47.8'W
Last Internal ContactU311:35:36.611:35:02.870°21.2'S047°38.4'E
Last External ContactU411:46:11.611:45:37.867°16.2'S054°12.9'E
Extreme Northern and Southern Path Limits of Umbra
Contact Event Contact Time
TD
Time
UT1
Latitude Longitude
North Extreme Path Limit 1N109:47:56.109:47:22.245°48.2'S039°13.0'W
South Extreme Path Limit 1S109:56:58.209:56:24.450°28.7'S038°27.3'W
North Extreme Path Limit 2N211:45:21.811:44:48.067°03.0'S054°56.6'E
South Extreme Path Limit 2S211:36:18.411:35:44.670°30.5'S046°52.4'E

Explanation of Umbral Shadow Contacts and Extremes Tables

Central Line Extremes and Duration: Annular Solar Eclipse of 1961 Aug 11

Extreme Limits of the Central Line
Contact Event Contact Time
TD
Time
UT1
Latitude Longitude
Extreme Central Line Limit 1C109:52:11.009:51:37.248°03.0'S038°54.2'W
Extreme Central Line Limit 2C211:41:06.311:40:32.568°46.9'S051°28.0'E

Explanation of Central Line Extremes Table

Greatest Eclipse and Greatest Duration
Event Time
TD
Time
UT1
Latitude Longitude Sun
Altitude
Sun
Azimuth
Path Width Central
Duration
Greatest Eclipse10:46:46.910:46:13.145°49.9'S003°53.9'E 27.3° 17.1° 499.4 km06m35.28s
Greatest Duration10:45:01.910:44:28.145°35.2'S003°19.3'E 27.2° 18.3° 502.0 km06m35.33s

Explanation of Greatest Eclipse and Greatest Duration

Polynomial Besselian Elements: Annular Solar Eclipse of 1961 Aug 11

Polynomial Besselian Elements
1961 Aug 11 at 11:00:00.0 TD (=t0)
n x y d l1 l2 μ
0 -0.08008 -0.88930 15.2784 0.56657 0.02031 343.7114
1 0.49360 -0.10770 -0.0121 0.00000 0.00000 15.0029
2 -0.00002 -0.00005 -0.0000 -0.00001 -0.00001 0.0000
3 -0.00001 0.00000 - - - -
Tan ƒ1 0.0046147
Tan ƒ2 0.0045917

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 Polynomial Besselian Elements

Links for the Annular Solar Eclipse of 1961 Aug 11

Links to Additional Solar Eclipse Information

Eclipse Predictions

Predictions for the Annular Solar Eclipse of 1961 Aug 11 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 33.8 seconds for this eclipse.

Acknowledgments

Some of the content on this website is based on the book Thousand Year Canon of Solar 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.