Solar Eclipse Prime Page

Annular Solar Eclipse of 1921 Apr 08

Fred Espenak

Introduction


The Annular Solar Eclipse of 1921 Apr 08 is visible from the following geographic regions:

  • Partial Eclipse: north Africa, Asia, north Canada, Greenland
  • Annular Eclipse: U.K., Norway, Russia

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 1921 Apr 08 at 09:15:01 TD (09:14:39 UT1). This is 6.5 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 -21.

The eclipse belongs to Saros 118 and is number 63 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 annular solar eclipse of 1921 Apr 08 is followed two weeks later by a total lunar eclipse on 1921 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 22.1 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 1921 Apr 08 .


Eclipse Data: Annular Solar Eclipse of 1921 Apr 08

Eclipse Characteristics
Parameter Value
Eclipse Magnitude 0.97530
Eclipse Obscuration 0.95120
Gamma 0.88692
Conjunction Times
Event Calendar Date & Time Julian Date
Greatest Eclipse 1921 Apr 08 at 09:15:01.3 TD (09:14:39.2 UT1) 2422787.885175
Ecliptic Conjunction 1921 Apr 08 at 09:05:08.6 TD (09:04:46.5 UT1) 2422787.878316
Equatorial Conjunction 1921 Apr 08 at 09:44:56.4 TD (09:44:34.3 UT1) 2422787.905952
Geocentric Coordinates of Sun and Moon
1921 Apr 08 at 09:15:01.3 TD (09:14:39.2 UT1)
Coordinate Sun Moon
Right Ascension01h06m22.7s01h05m24.3s
Declination+07°03'40.4"+07°51'45.1"
Semi-Diameter 15'58.0" 15'28.0"
Eq. Hor. Parallax 08.8" 0°56'45.6"
Geocentric Libration of Moon
Angle Value
l -5.1°
b -1.1°
c -24.0°
Prediction Paramaters
Paramater Value
Ephemerides JPL DE406
ΔT 22.1 s
k (penumbra) 0.2725076
k (umbra) 0.2722810
Saros Series 118 (63/72)

Explanation of Solar Eclipse Data Tables

Penumbral Shadow Contacts and Extremes: Annular Solar Eclipse of 1921 Apr 08

Contacts of Penumbral Shadow with Earth
Contact Event Contact Time
TD
Time
UT1
Latitude Longitude
First External ContactP106:51:44.606:51:22.517°58.6'N014°37.0'W
Last External ContactP411:37:57.811:37:35.751°11.3'N105°00.0'E
Extreme Northern and Southern Path Limits of Penumbra
Contact Event Contact Time
TD
Time
UT1
Latitude Longitude
North Extreme Path Limit 1N107:25:38.207:25:16.102°39.1'N021°08.0'W
South Extreme Path Limit 1S111:04:12.211:03:50.036°03.3'N109°44.0'E

Explanation of Penumbral Shadow Contacts and Extremes Tables

Umbral Shadow Contacts and Extremes: Annular Solar Eclipse of 1921 Apr 08

Contacts of Umbral Shadow with Earth
Contact Event Contact Time
TD
Time
UT1
Latitude Longitude
First External ContactU108:21:25.508:21:03.444°41.1'N041°46.5'W
First Internal ContactU208:25:55.208:25:33.146°41.9'N043°24.8'W
Last Internal ContactU310:03:48.210:03:26.078°18.9'N156°30.0'E
Last External ContactU410:08:12.110:07:50.076°40.5'N150°08.1'E
Extreme Northern and Southern Path Limits of Umbra
Contact Event Contact Time
TD
Time
UT1
Latitude Longitude
North Extreme Path Limit 1N108:25:42.408:25:20.346°49.1'N043°23.6'W
South Extreme Path Limit 1S108:21:39.308:21:17.144°33.3'N041°48.0'W
North Extreme Path Limit 2N210:04:00.610:03:38.578°24.5'N156°48.4'E
South Extreme Path Limit 2S210:07:58.710:07:36.676°34.0'N149°53.9'E

Explanation of Umbral Shadow Contacts and Extremes Tables

Central Line Extremes and Duration: Annular Solar Eclipse of 1921 Apr 08

Extreme Limits of the Central Line
Contact Event Contact Time
TD
Time
UT1
Latitude Longitude
Extreme Central Line Limit 1C108:23:38.108:23:15.945°39.9'N042°34.4'W
Extreme Central Line Limit 2C210:06:02.510:05:40.377°29.2'N153°04.1'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 Eclipse09:15:01.309:14:39.264°29.3'N005°28.4'E 27.1° 138.7° 191.5 km01m50.31s
Greatest Duration08:23:38.108:23:15.945°39.9'N042°34.4'W 0.0° 79.9° 267.9 km01m56.60s

Explanation of Greatest Eclipse and Greatest Duration

Polynomial Besselian Elements: Annular Solar Eclipse of 1921 Apr 08

Polynomial Besselian Elements
1921 Apr 08 at 09:00:00.0 TD (=t0)
n x y d l1 l2 μ
0 -0.38385 0.81070 7.0553 0.55527 0.00907 314.4922
1 0.51245 0.15423 0.0152 -0.00012 -0.00012 15.0042
2 0.00005 -0.00007 -0.0000 -0.00001 -0.00001 -0.0000
3 -0.00001 -0.00000 - - - -
Tan ƒ1 0.0046684
Tan ƒ2 0.0046452

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 = 9.000

Explanation of Polynomial Besselian Elements

Links for the Annular Solar Eclipse of 1921 Apr 08

Links to Additional Solar Eclipse Information

Eclipse Predictions

Predictions for the Annular Solar Eclipse of 1921 Apr 08 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 22.1 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.