Solar Eclipse Prime Page

Total Solar Eclipse of -0773 Jan 21 (0774 Jan 21 BCE)

Fred Espenak

Introduction

eclipse map

The Total Solar Eclipse of -0773 Jan 21 (0774 Jan 21 BCE) is visible from the geographic regions shown on the map to the right. 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 -0773 Jan 21 at 05:16:12 TD (23:19:56 UT1). This is 0.3 days after the Moon reaches perigee. During the eclipse, the Sun is in the constellation Aquarius. The synodic month in which the eclipse takes place has a Brown Lunation Number of -33344.

The eclipse belongs to Saros 38 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 -0773 Jan 21 is a relatively long total eclipse with a duration at greatest eclipse of 05m04s. It has an eclipse magnitude of 1.0525.

The total solar eclipse of -0773 Jan 21 is followed two weeks later by a penumbral lunar eclipse on -0773 Feb 05.

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 21376.8 seconds for this eclipse. The uncertainty in ΔT is 535.7 seconds corresponding to a standard error in longitude of the eclipse path of ± 2.24°.

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 -0773 Jan 21 .

Eclipse Data: Total Solar Eclipse of -0773 Jan 21

Eclipse Characteristics
Parameter Value
Eclipse Magnitude 1.05249
Eclipse Obscuration 1.10773
Gamma 0.40410
Conjunction Times
Event Calendar Date and Time Julian Date
Greatest Eclipse -0773 Jan 21 at 05:16:12.4 TD (23:19:55.6 UT1) 1438739.472171
Ecliptic Conjunction -0773 Jan 21 at 05:12:05.4 TD (23:15:48.6 UT1) 1438739.469313
Equatorial Conjunction -0773 Jan 21 at 05:19:21.6 TD (23:23:04.8 UT1) 1438739.474361
Geocentric Coordinates of Sun and Moon
-0773 Jan 21 at 05:16:12.4 TD (23:19:55.6 UT1)
Coordinate Sun Moon
Right Ascension19h41m52.4s19h41m44.4s
Declination-21°41'58.9"-21°17'17.8"
Semi-Diameter 16'09.0" 16'44.0"
Eq. Hor. Parallax 08.9" 1°01'24.6"
Geocentric Libration of Moon
Angle Value
l 0.9°
b -0.5°
c -11.7°
Prediction Paramaters
Paramater Value
Ephemerides JPL DE406
ΔT 21376.8 s
k (penumbra) 0.2725076
k (umbra) 0.2722810
Saros Series 38 (54/73)

Explanation of Solar Eclipse Data Tables

Penumbral Shadow Contacts and Extremes: Total Solar Eclipse of -0773 Jan 21

Contacts of Penumbral Shadow with Earth
Contact Event Contact Time
TD		 Time
UT1		 Latitude Longitude
First External ContactP102:43:36.120:47:19.310°13.1'N146°05.8'E
First Internal ContactP204:53:19.822:57:03.051°11.9'N139°13.2'E
Last Internal ContactP305:39:00.023:42:43.257°53.9'N121°13.9'W
Last External ContactP407:48:47.801:52:31.018°16.7'N121°51.4'W
Extreme Northern and Southern Path Limits of Penumbra
Contact Event Contact Time
TD		 Time
UT1		 Latitude Longitude
North Extreme Path Limit 1N104:38:02.422:41:45.658°12.3'N153°19.4'E
South Extreme Path Limit 1S103:42:50.021:46:33.210°46.8'S122°49.5'E
North Extreme Path Limit 2N205:54:15.023:57:58.263°45.3'N139°28.9'W
South Extreme Path Limit 2S206:49:36.100:53:19.302°41.4'S098°26.6'W

Explanation of Penumbral Shadow Contacts and Extremes Tables

Umbral Shadow Contacts and Extremes: Total Solar Eclipse of -0773 Jan 21

Contacts of Umbral Shadow with Earth
Contact Event Contact Time
TD		 Time
UT1		 Latitude Longitude
First External ContactU103:41:02.121:44:45.317°58.3'N135°02.6'E
First Internal ContactU203:43:08.721:46:51.918°24.7'N134°42.7'E
Last Internal ContactU306:49:14.100:52:57.326°23.9'N110°48.5'W
Last External ContactU406:51:20.300:55:03.525°58.0'N111°07.0'W
Extreme Northern and Southern Path Limits of Umbra
Contact Event Contact Time
TD		 Time
UT1		 Latitude Longitude
North Extreme Path Limit 1N103:42:21.921:46:05.118°43.6'N135°02.9'E
South Extreme Path Limit 1S103:41:49.821:45:33.017°39.2'N134°42.2'E
North Extreme Path Limit 2N206:50:00.700:53:43.926°42.6'N111°09.6'W
South Extreme Path Limit 2S206:50:32.800:54:16.025°39.2'N110°45.7'W

Explanation of Umbral Shadow Contacts and Extremes Tables

Central Line Extremes and Duration: Total Solar Eclipse of -0773 Jan 21

Extreme Limits of the Central Line
Contact Event Contact Time
TD		 Time
UT1		 Latitude Longitude
Extreme Central Line Limit 1C103:42:05.321:45:48.618°11.4'N134°52.6'E
Extreme Central Line Limit 2C206:50:17.200:54:00.426°10.8'N110°57.7'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 Eclipse05:16:12.423:19:55.602°05.2'N102°46.0'E 66.2° 176.0° 189.8 km05m04.17s
Greatest Duration05:14:48.323:18:31.502°02.0'N168°20.9'W 66.1° 174.2° 189.9 km05m04.21s

Explanation of Greatest Eclipse and Greatest Duration

Polynomial Besselian Elements: Total Solar Eclipse of -0773 Jan 21

Polynomial Besselian Elements
-0773 Jan 21 at 05:00:00.0 TD (=t0)
n x y d l1 l2 μ
0 -0.18753 0.39105 -21.7026 0.53679 -0.00932 251.4307
1 0.58117 0.04399 0.0072 0.00002 0.00002 14.9982
2 -0.00000 0.00014 0.0000 -0.00001 -0.00001 0.0000
3 -0.00001 -0.00000 - - - -
Tan ƒ1 0.0047209
Tan ƒ2 0.0046974

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 = 5.000

Explanation of Polynomial Besselian Elements

Links for the Total Solar Eclipse of -0773 Jan 21 (0774 Jan 21 BCE)

Links to Additional Solar Eclipse Information

Calendar

The Gregorian calendar (also called the Western calendar) is internationally the most widely used civil calendar. It is named for Pope Gregory XIII, who introduced it in 1582. On this website, the Gregorian calendar is used for all calendar dates from 1582 Oct 15 onwards. Before that date, the Julian calendar is used. For more information on this topic, see Calendar Dates.

The Julian calendar does not include the year 0. Thus the year 1 BCE is followed by the year 1 CE (See: BCE/CE Dating Conventions). This is awkward for arithmetic calculations. Years in this catalog are numbered astronomically and include the year 0. Historians should note there is a difference of one year between astronomical dates and BCE dates. Thus, the astronomical year 0 corresponds to 1 BCE, and astronomical year -1 corresponds to 2 BCE, etc..

Eclipse Predictions

Predictions for the Total Solar Eclipse of -0773 Jan 21 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 21376.8 seconds for this eclipse. The uncertainty in ΔT is 535.7 seconds corresponding to a standard error in longitude of the eclipse path of ± 2.24°.

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.