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https://askastrology.com/how-to-read-an-ephemeris/
The times in the ephemeris are shown in GMT. To change over to your time zone, subtract 4 hours for Atlantic, 5 hours for Eastern, 6 for Central, 8 for Pacific and 7 hours for Mountain. In Daylight Saving Time, subtract one hour less. The zodiac signs in the ephemeris
http://ephemeris.com/space-time.html
The Earth revolves 360 degrees in Longitude ever 24 hours, which is 360 degrees / 24 hours = 15 degrees/hour. Convert the hour offset into hours, minutes, and seconds. In our example, our local offset is 7 hours 38 minutes and 00 seconds earlier than Greenwich, so we'll subtract this from the Greenwich Sidereal Time.
https://www.twoheadedastrology.com/how-to-read-an-ephemeris.html
The times and dates given in this ephemeris are calculated for Midnight UT (Universal Time) therefore, depending on where you are, you will have to convert the times to your location. For instance: If you are in the then Subtract. Eastern Time Zone 5 hours; Central Time Zone 6 hours; Mountain Time Zone 7 hours
https://cddis.nasa.gov/Data_and_Derived_Products/GNSS/broadcast_ephemeris_data.html
Hourly GPS Broadcast Ephemeris Files. The combined broadcast ephemeris file is generated on an hourly basis from all hourly navigation files archived at the CDDIS. The hourly navigation file contains all broadcast messages with the TOE of the day that are available when the file is created at the top of the hour.
https://trans4mind.com/personal_development/astrology/Calculations/calcLocalSidTimeMidnight.htm
The noon ephemeris says 3 hours exactly. However, by subtracting our 1 second for every six hours, we get the correct figure: 3:00:00 . Alternatively we can use the factor 1.002737909 to obtain the correction: 12x1.002737909 = 12.03285491 or . 12 hours 1 minute 58.3 seconds. This figure gives us the correct sidereal time at noon: 12:01:58.3 seconds+
https://en.wikipedia.org/wiki/Ephemeris_time
The term ephemeris time can in principle refer to time in association with any ephemeris. In practice it has been used more specifically to refer to: a former standard astronomical time scale adopted in 1952 by the IAU, and superseded during the 1970s. This time scale was proposed in 1948, to overcome the disadvantages of irregularly fluctuating mean solar time. The intent was …
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