Solar Eclipse Prime Page

Annular Solar Eclipse of 1940 Apr 07

Fred Espenak

Introduction


The Annular Solar Eclipse of 1940 Apr 07 is visible from the following geographic regions:

  • Partial Eclipse: North America, Central America, north South America
  • Annular Eclipse: central Pacific, Mexico, U.S.

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 1940 Apr 07 at 20:21:21 TD (20:20:56 UT1). This is 2.5 days after the Moon reaches apogee. During the eclipse, the Sun is in the constellation Aries. The synodic month in which the eclipse takes place has a Brown Lunation Number of 214.

The eclipse belongs to Saros 128 and is number 54 of 73 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 solar eclipse of 1940 Apr 07 is a relatively long annular eclipse with a duration at greatest eclipse of 07m30s. It has an eclipse magnitude of 0.9394.

The annular solar eclipse of 1940 Apr 07 is preceded two weeks earlier by a penumbral lunar eclipse on 1940 Mar 23, and it is followed two weeks later by a penumbral lunar eclipse on 1940 Apr 22.

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 24.5 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 Annular Solar Eclipse of 1940 Apr 07 .


Eclipse Data: Annular Solar Eclipse of 1940 Apr 07

Eclipse Characteristics
Parameter Value
Eclipse Magnitude 0.93942
Eclipse Obscuration 0.88252
Gamma 0.21897
Conjunction Times
Event Calendar Date & Time Julian Date
Greatest Eclipse 1940 Apr 07 at 20:21:20.8 TD (20:20:56.4 UT1) 2429727.347874
Ecliptic Conjunction 1940 Apr 07 at 20:18:43.9 TD (20:18:19.5 UT1) 2429727.346059
Equatorial Conjunction 1940 Apr 07 at 20:29:05.3 TD (20:28:40.8 UT1) 2429727.353250
Geocentric Coordinates of Sun and Moon
1940 Apr 07 at 20:21:20.8 TD (20:20:56.4 UT1)
Coordinate Sun Moon
Right Ascension01h05m52.5s01h05m38.8s
Declination+07°00'32.1"+07°11'53.1"
Semi-Diameter 15'58.2" 14'47.0"
Eq. Hor. Parallax 08.8" 0°54'15.4"
Geocentric Libration of Moon
Angle Value
l -2.4°
b -0.3°
c -24.0°
Prediction Paramaters
Paramater Value
Ephemerides JPL DE406
ΔT 24.5 s
k (penumbra) 0.2725076
k (umbra) 0.2722810
Saros Series 128 (54/73)

Explanation of Solar Eclipse Data Tables

Penumbral Shadow Contacts and Extremes: Annular Solar Eclipse of 1940 Apr 07

Contacts of Penumbral Shadow with Earth
Contact Event Contact Time
TD
Time
UT1
Latitude Longitude
First External ContactP117:17:50.217:17:25.708°38.6'S167°45.8'W
First Internal ContactP219:37:26.319:37:01.813°49.4'N154°32.0'E
Last Internal ContactP321:05:02.921:04:38.447°00.2'N038°03.4'W
Last External ContactP423:24:44.523:24:20.024°37.0'N077°19.6'W
Extreme Northern and Southern Path Limits of Penumbra
Contact Event Contact Time
TD
Time
UT1
Latitude Longitude
North Extreme Path Limit 1N119:11:01.719:10:37.235°12.3'N157°54.3'E
South Extreme Path Limit 1S118:26:35.118:26:10.636°56.8'S179°15.9'E
North Extreme Path Limit 2N221:31:15.921:30:51.467°48.2'N034°37.1'W
South Extreme Path Limit 2S222:16:19.222:15:54.703°43.4'S063°55.7'W

Explanation of Penumbral Shadow Contacts and Extremes Tables

Umbral Shadow Contacts and Extremes: Annular Solar Eclipse of 1940 Apr 07

Contacts of Umbral Shadow with Earth
Contact Event Contact Time
TD
Time
UT1
Latitude Longitude
First External ContactU118:23:22.618:22:58.104°17.8'S175°18.7'E
First Internal ContactU218:28:45.318:28:20.803°43.6'S173°53.8'E
Last Internal ContactU322:13:51.722:13:27.229°30.9'N058°50.7'W
Last External ContactU422:19:11.622:18:47.128°57.1'N060°16.2'W
Extreme Northern and Southern Path Limits of Umbra
Contact Event Contact Time
TD
Time
UT1
Latitude Longitude
North Extreme Path Limit 1N118:26:50.018:26:25.602°42.8'S174°15.2'E
South Extreme Path Limit 1S118:25:20.618:24:56.105°18.9'S174°56.7'E
North Extreme Path Limit 2N222:15:45.322:15:20.830°30.8'N059°09.2'W
South Extreme Path Limit 2S222:17:15.222:16:50.727°56.8'N059°56.7'W

Explanation of Umbral Shadow Contacts and Extremes Tables

Central Line Extremes and Duration: Annular Solar Eclipse of 1940 Apr 07

Extreme Limits of the Central Line
Contact Event Contact Time
TD
Time
UT1
Latitude Longitude
Extreme Central Line Limit 1C118:26:03.918:25:39.404°01.1'S174°36.3'E
Extreme Central Line Limit 2C222:16:31.822:16:07.329°13.6'N059°33.5'W

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 Eclipse20:21:20.820:20:56.419°13.6'N128°37.8'W 77.2° 162.6° 229.9 km07m30.35s
Greatest Duration20:26:12.220:25:47.719°56.2'N127°21.4'W 77.0° 173.7° 229.4 km07m30.56s

Explanation of Greatest Eclipse and Greatest Duration

Polynomial Besselian Elements: Annular Solar Eclipse of 1940 Apr 07

Polynomial Besselian Elements
1940 Apr 07 at 20:00:00.0 TD (=t0)
n x y d l1 l2 μ
0 -0.23589 0.15797 7.0030 0.56843 0.02216 119.4805
1 0.48654 0.14563 0.0153 -0.00005 -0.00005 15.0041
2 0.00003 -0.00004 -0.0000 -0.00001 -0.00001 -0.0000
3 -0.00001 -0.00000 - - - -
Tan ƒ1 0.0046699
Tan ƒ2 0.0046466

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 = 20.000

Explanation of Polynomial Besselian Elements

Links for the Annular Solar Eclipse of 1940 Apr 07

Links to Additional Solar Eclipse Information

Eclipse Predictions

Predictions for the Annular Solar Eclipse of 1940 Apr 07 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 24.5 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.