Solar Eclipse Prime Page

Partial Solar Eclipse of -1577 Apr 28 (1578 Apr 28 BCE)

Fred Espenak

Introduction

eclipse map

The Partial Solar Eclipse of -1577 Apr 28 (1578 Apr 28 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 -1577 Apr 28 at 09:27:58 TD (23:16:15 UT1). This is 1.8 days after the Moon reaches perigee. During the eclipse, the Sun is in the constellation Taurus. The synodic month in which the eclipse takes place has a Brown Lunation Number of -43285.

The eclipse belongs to Saros 42 and is number 1 of 72 eclipses in the series. Thus, the -1577 Apr 28 event is the very first eclipse of 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.

This is an extremely shallow partial eclipse. It has an eclipse magnitude of only 0.0232, while Gamma has a value of -1.5198. This is a very deep partial eclipse. It has an eclipse magnitude of 0.0232, while Gamma has a value of -1.5198.

The partial solar eclipse of -1577 Apr 28 is preceded two weeks earlier by a total lunar eclipse on -1577 Apr 14.

Another solar eclipse occurs one synodic month before the -1577 Apr 28 eclipse. It is the total solar eclipse of -1577 Mar 30.

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 36702.1 seconds for this eclipse. The uncertainty in ΔT is 2145.9 seconds corresponding to a standard error in longitude of the eclipse path of ± 8.97°.

The following links provide maps and data for the eclipse.

The tables below contain detailed predictions and additional information on the Partial Solar Eclipse of -1577 Apr 28 .

Eclipse Data: Partial Solar Eclipse of -1577 Apr 28

Eclipse Characteristics
Parameter Value
Eclipse Magnitude 0.02318
Eclipse Obscuration 0.00427
Gamma-1.51984
Conjunction Times
Event Calendar Date and Time Julian Date
Greatest Eclipse -1577 Apr 28 at 09:27:57.5 TD (23:16:15.4 UT1) 1145175.469623
Ecliptic Conjunction -1577 Apr 28 at 09:43:09.5 TD (23:31:27.5 UT1) 1145175.480179
Equatorial Conjunction -1577 Apr 28 at 08:39:45.4 TD (22:28:03.3 UT1) 1145175.436149
Geocentric Coordinates of Sun and Moon
-1577 Apr 28 at 09:27:57.5 TD (23:16:15.4 UT1)
Coordinate Sun Moon
Right Ascension01h22m09.9s01h23m56.5s
Declination+08°49'46.1"+07°22'23.4"
Semi-Diameter 15'43.6" 16'24.1"
Eq. Hor. Parallax 08.6" 1°00'11.6"
Geocentric Libration of Moon
Angle Value
l 3.9°
b 2.1°
c -23.5°
Prediction Paramaters
Paramater Value
Ephemerides JPL DE406
ΔT 36702.1 s
k (penumbra) 0.2725076
k (umbra) 0.2722810
Saros Series 42 ( 1/72)

Explanation of Solar Eclipse Data Tables

Penumbral Shadow Contacts and Extremes: Partial Solar Eclipse of -1577 Apr 28

Contacts of Penumbral Shadow with Earth
Contact Event Contact Time
TD		 Time
UT1		 Latitude Longitude
First External ContactP109:07:56.922:56:14.876°58.7'S116°58.8'W
Last External ContactP409:48:23.623:36:41.664°31.1'S103°56.8'W
Extreme Northern and Southern Path Limits of Penumbra
Contact Event Contact Time
TD		 Time
UT1		 Latitude Longitude
North Extreme Path Limit 1N109:12:33.023:00:50.978°09.4'S123°44.0'W
South Extreme Path Limit 1S109:43:51.023:32:09.062°52.1'S101°25.9'W

Explanation of Penumbral Shadow Contacts and Extremes Tables

Polynomial Besselian Elements: Partial Solar Eclipse of -1577 Apr 28

Polynomial Besselian Elements
-1577 Apr 28 at 09:00:00.0 TD (=t0)
n x y d l1 l2 μ
0 0.18480 -1.53194 8.8261 0.53494 -0.01116 316.1473
1 0.54773 0.16565 0.0147 0.00010 0.00009 15.0052
2 -0.00001 0.00003 -0.0000 -0.00001 -0.00001 -0.0000
3 -0.00001 -0.00000 - - - -
Tan ƒ1 0.0045971
Tan ƒ2 0.0045742

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 Partial Solar Eclipse of -1577 Apr 28 (1578 Apr 28 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 Partial Solar Eclipse of -1577 Apr 28 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 36702.1 seconds for this eclipse. The uncertainty in ΔT is 2145.9 seconds corresponding to a standard error in longitude of the eclipse path of ± 8.97°.

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.