Eclipse listing, timing and the Saros series

Recent (11th August 2017) knowledge base article:


Eclipse listing for 2016-2018

Typical Eclipse Listing

Typical Eclipse Listing. All times are in UT (Universal Time)

How did I do this?

Load a Natal chart and tap Secondary Progressions, and then tap Bi-Wheel. Select a year: 2017. Next tap the eclipse button/icon. This allows AC to calculate the eclipses for 2017. Note all eclipse aspects are to the natal chart – the Eclipse listings will have a range approx 2016-2018. To see the aspects to the natal chart tap the Aspect button/icon.

Eclipse Icon

Eclipse Icon

Aspect Icon

Aspect Icon

Solar Eclipse for August 21st, 2017

Let’s look at the solar eclipse listing for August 21st, 2017, at 28Leo52. This is a total eclipse, and the Saros series is 145 The time of the maximum eclipse is at 6:25:34 UT (Universal Time)


This timing of the eclipse is from the site of Fred Espenak

Fred Espenak Eclipse Site

Conjunction Times
Event Calendar Date & Time Julian Date
Greatest Eclipse 2017 Aug 21 at 18:26:40.3 TD (18:25:31.7 UT1) 2457987.267728
Ecliptic Conjunction 2017 Aug 21 at 18:31:19.6 TD (18:30:11.0 UT1) 2457987.270961
Equatorial Conjunction 2017 Aug 21 at 18:14:22.8 TD (18:13:14.3 UT1) 2457987.259193



UT time of the Greatest Eclipse is in Bold – my emphasis. Note many eclipse sites give the TD time (Terrestrial Dynamic) as 2017 Aug 21 at 18:26:40.3


To get the TD time from the given UT time as given by Fred Espenak:


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). Δ Thas a value of 68.5 seconds for this eclipse.

So for the given UT time of 16:25:34 for the eclipse of Aug 21st 2017, add 68.5 seconds which gives 16:26:42

Solar Eclipse Aug 2017 – interesting article


in Eclipse