Solar Eclipse Prime Page

Total Solar Eclipse of 1618 Jul 21

Fred Espenak

Introduction


The Total Solar Eclipse of 1618 Jul 21 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 1618 Jul 21 at 19:44:29 TD (19:42:53 UT1). This is 4.0 days after the Moon reaches perigee. During the eclipse, the Sun is in the constellation Cancer. The synodic month in which the eclipse takes place has a Brown Lunation Number of -3765.

The eclipse belongs to Saros 120 and is number 39 of 71 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 total solar eclipse of 1618 Jul 21 is followed two weeks later by a penumbral lunar eclipse on 1618 Aug 06.

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 95.6 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 1618 Jul 21 .


Eclipse Data: Total Solar Eclipse of 1618 Jul 21

Eclipse Characteristics
Parameter Value
Eclipse Magnitude 1.02603
Eclipse Obscuration 1.05273
Gamma 0.35581
Conjunction Times
Event Calendar Date & Time Julian Date
Greatest Eclipse 1618 Jul 21 at 19:44:28.8 TD (19:42:53.2 UT1) 2312224.321449
Ecliptic Conjunction 1618 Jul 21 at 19:40:40.3 TD (19:39:04.7 UT1) 2312224.318804
Equatorial Conjunction 1618 Jul 21 at 19:32:23.1 TD (19:30:47.5 UT1) 2312224.313049
Geocentric Coordinates of Sun and Moon
1618 Jul 21 at 19:44:28.8 TD (19:42:53.2 UT1)
Coordinate Sun Moon
Right Ascension08h03m12.5s08h03m39.0s
Declination+20°28'15.3"+20°48'01.9"
Semi-Diameter 15'44.9" 15'54.9"
Eq. Hor. Parallax 08.7" 0°58'24.4"
Geocentric Libration of Moon
Angle Value
l 4.9°
b -0.4°
c 10.3°
Prediction Paramaters
Paramater Value
Ephemerides JPL DE406
ΔT 95.6 s
k (penumbra) 0.2725076
k (umbra) 0.2722810
Saros Series 120 (39/71)

Explanation of Solar Eclipse Data Tables

Penumbral Shadow Contacts and Extremes: Total Solar Eclipse of 1618 Jul 21

Contacts of Penumbral Shadow with Earth
Contact Event Contact Time
TD
Time
UT1
Latitude Longitude
First External ContactP117:01:49.717:00:14.128°43.0'N175°28.8'W
First Internal ContactP219:13:55.019:12:19.461°05.0'N120°47.3'E
Last Internal ContactP320:15:18.520:13:42.931°40.6'N018°43.4'W
Last External ContactP422:27:18.822:25:43.203°53.8'S066°29.8'W
Extreme Northern and Southern Path Limits of Penumbra
Contact Event Contact Time
TD
Time
UT1
Latitude Longitude
North Extreme Path Limit 1N119:01:12.918:59:37.267°58.6'N099°06.1'E
South Extreme Path Limit 1S117:47:59.717:46:24.006°37.4'N177°41.6'W
North Extreme Path Limit 2N220:28:05.220:26:29.543°08.0'N014°46.1'W
South Extreme Path Limit 2S221:40:54.421:39:18.826°04.3'S063°57.2'W

Explanation of Penumbral Shadow Contacts and Extremes Tables

Umbral Shadow Contacts and Extremes: Total Solar Eclipse of 1618 Jul 21

Contacts of Umbral Shadow with Earth
Contact Event Contact Time
TD
Time
UT1
Latitude Longitude
First External ContactU118:02:59.418:01:23.735°32.7'N165°33.9'E
First Internal ContactU218:03:39.518:02:03.935°39.6'N165°19.8'E
Last Internal ContactU321:25:29.221:23:53.603°15.3'N048°22.1'W
Last External ContactU421:26:03.921:24:28.203°09.1'N048°33.0'W
Extreme Northern and Southern Path Limits of Umbra
Contact Event Contact Time
TD
Time
UT1
Latitude Longitude
North Extreme Path Limit 1N118:03:29.318:01:53.735°45.6'N165°18.8'E
South Extreme Path Limit 1S118:03:09.718:01:34.035°26.6'N165°34.8'E
North Extreme Path Limit 2N221:25:38.121:24:02.403°20.7'N048°22.2'W
South Extreme Path Limit 2S221:25:54.921:24:19.303°03.7'N048°32.9'W

Explanation of Umbral Shadow Contacts and Extremes Tables

Central Line Extremes and Duration: Total Solar Eclipse of 1618 Jul 21

Extreme Limits of the Central Line
Contact Event Contact Time
TD
Time
UT1
Latitude Longitude
Extreme Central Line Limit 1C118:03:19.518:01:43.835°36.1'N165°26.8'E
Extreme Central Line Limit 2C221:25:46.621:24:10.903°12.2'N048°27.6'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 Eclipse19:44:28.819:42:53.240°22.5'N106°42.3'W 68.9° 201.4° 94.5 km02m13.26s
Greatest Duration19:38:42.419:37:06.841°28.2'N108°38.0'W 68.7° 191.0° 94.2 km02m13.52s

Explanation of Greatest Eclipse and Greatest Duration

Polynomial Besselian Elements: Total Solar Eclipse of 1618 Jul 21

Polynomial Besselian Elements
1618 Jul 21 at 20:00:00.0 TD (=t0)
n x y d l1 l2 μ
0 0.24316 0.29661 20.4681 0.54352 -0.00262 118.6100
1 0.52829 -0.16581 -0.0077 0.00011 0.00011 15.0008
2 -0.00007 -0.00014 -0.0000 -0.00001 -0.00001 0.0000
3 -0.00001 0.00000 - - - -
Tan ƒ1 0.0046037
Tan ƒ2 0.0045808

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 Total Solar Eclipse of 1618 Jul 21

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 1618 Jul 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 95.6 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.