Total Eclipse of the Sun - USA - Monday, 21 August 2017

Universal Time - UT

Like most other astronomical calculations, eclipse predictions are usually presented in terms of Universal Time. In order to convert eclipse predictions from UT to local time, you need to know what time zone you are in.

For North Americans on August 2017 (Daylight Saving Time), the conversion from UT to local time is as follows :

Atlantic Daylight Time (ADT) =  UT - 3 hours  
Eastern Daylight Time (EDT)  =  UT - 4 hours
Central Daylight Time (CDT)  =  UT - 5 hours
Mountain Daylight Time (MDT) =  UT - 6 hours
Pacific Daylight Time (PDT)  =  UT - 7 hours

For example, let's assume that an eclipse begins in Dubois, Idaho on August 21 at 17:32 UT. Dubois is in the Moutain Daylight Time zone, so:

                     Local Time = 17:32 - 6 hours                                  = 11:32 (= 11:32 am)  

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