Solar Eclipse Prime Page

Total Solar Eclipse of 1921 Oct 01

Fred Espenak

Introduction


The Total Solar Eclipse of 1921 Oct 01 is visible from the following geographic regions:

  • Partial Eclipse: Antarctica, south South America
  • Total 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 1921 Oct 01 at 12:35:58 TD (12:35:36 UT1). This is 1.9 days after the Moon reaches perigee. During the eclipse, the Sun is in the constellation Virgo. The synodic month in which the eclipse takes place has a Brown Lunation Number of -15.

The eclipse belongs to Saros 123 and is number 48 of 70 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 total solar eclipse of 1921 Oct 01 is followed two weeks later by a partial lunar eclipse on 1921 Oct 16.

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 22.4 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 Solar Eclipse of 1921 Oct 01 .


Eclipse Data: Total Solar Eclipse of 1921 Oct 01

Eclipse Characteristics
Parameter Value
Eclipse Magnitude 1.02931
Eclipse Obscuration 1.05948
Gamma-0.93833
Conjunction Times
Event Calendar Date & Time Julian Date
Greatest Eclipse 1921 Oct 01 at 12:35:58.1 TD (12:35:35.6 UT1) 2422964.024718
Ecliptic Conjunction 1921 Oct 01 at 12:26:22.9 TD (12:26:00.4 UT1) 2422964.018061
Equatorial Conjunction 1921 Oct 01 at 13:07:31.9 TD (13:07:09.5 UT1) 2422964.046638
Geocentric Coordinates of Sun and Moon
1921 Oct 01 at 12:35:58.1 TD (12:35:35.6 UT1)
Coordinate Sun Moon
Right Ascension12h28m35.7s12h27m27.1s
Declination-03°05'21.9"-03°58'54.5"
Semi-Diameter 15'58.8" 16'21.8"
Eq. Hor. Parallax 08.8" 1°00'03.1"
Geocentric Libration of Moon
Angle Value
l 3.9°
b 1.2°
c 24.8°
Prediction Paramaters
Paramater Value
Ephemerides JPL DE406
ΔT 22.4 s
k (penumbra) 0.2725076
k (umbra) 0.2722810
Saros Series 123 (48/70)

Explanation of Solar Eclipse Data Tables

Penumbral Shadow Contacts and Extremes: Total Solar Eclipse of 1921 Oct 01

Contacts of Penumbral Shadow with Earth
Contact Event Contact Time
TD
Time
UT1
Latitude Longitude
First External ContactP110:27:26.710:27:04.319°55.3'S070°24.9'W
Last External ContactP414:44:18.514:43:56.055°21.5'S050°59.0'E
Extreme Northern and Southern Path Limits of Penumbra
Contact Event Contact Time
TD
Time
UT1
Latitude Longitude
North Extreme Path Limit 1N110:57:59.810:57:37.305°48.2'S077°15.9'W
South Extreme Path Limit 1S114:13:48.414:13:26.041°20.3'S056°49.7'E

Explanation of Penumbral Shadow Contacts and Extremes Tables

Umbral Shadow Contacts and Extremes: Total Solar Eclipse of 1921 Oct 01

Contacts of Umbral Shadow with Earth
Contact Event Contact Time
TD
Time
UT1
Latitude Longitude
First External ContactU111:58:17.211:57:54.751°29.5'S095°54.0'W
First Internal ContactU212:02:12.312:01:49.953°29.4'S097°10.3'W
Last Internal ContactU313:09:22.813:09:00.386°45.5'S142°57.6'E
Last External ContactU413:13:14.013:12:51.685°44.3'S115°48.0'E
Extreme Northern and Southern Path Limits of Umbra
Contact Event Contact Time
TD
Time
UT1
Latitude Longitude
North Extreme Path Limit 1N111:58:24.111:58:01.751°25.5'S095°55.1'W
South Extreme Path Limit 1S112:02:06.112:01:43.753°33.0'S097°09.3'W
North Extreme Path Limit 2N213:13:07.213:12:44.885°41.7'S115°12.4'E
South Extreme Path Limit 2S213:09:28.813:09:06.486°46.5'S143°55.1'E

Explanation of Umbral Shadow Contacts and Extremes Tables

Central Line Extremes and Duration: Total Solar Eclipse of 1921 Oct 01

Extreme Limits of the Central Line
Contact Event Contact Time
TD
Time
UT1
Latitude Longitude
Extreme Central Line Limit 1C112:00:11.911:59:49.552°27.6'S096°31.0'W
Extreme Central Line Limit 2C213:11:21.213:10:58.886°19.7'S127°09.6'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 Eclipse12:35:58.112:35:35.666°06.3'S056°12.2'W 19.7° 48.2° 290.6 km01m52.04s
Greatest Duration12:35:07.212:34:44.865°45.7'S056°38.9'W 19.7° 49.1° 291.6 km01m52.05s

Explanation of Greatest Eclipse and Greatest Duration

Polynomial Besselian Elements: Total Solar Eclipse of 1921 Oct 01

Polynomial Besselian Elements
1921 Oct 01 at 13:00:00.0 TD (=t0)
n x y d l1 l2 μ
0 -0.06814 -0.96327 -3.0936 0.53996 -0.00617 17.5519
1 0.54276 -0.17332 -0.0158 0.00008 0.00008 15.0047
2 -0.00000 0.00008 0.0000 -0.00001 -0.00001 -0.0000
3 -0.00001 0.00000 - - - -
Tan ƒ1 0.0046716
Tan ƒ2 0.0046484

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 = 13.000

Explanation of Polynomial Besselian Elements

Links for the Total Solar Eclipse of 1921 Oct 01

Links to Additional Solar Eclipse Information

Eclipse Predictions

Predictions for the Total Solar Eclipse of 1921 Oct 01 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 22.4 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.