To manually calculate the time you need to know the time for Haneitz Hachama (sunrise) and Shkias Hachama (sunset) for your location. The length of time between these two points are the daylight hours. Divide by 12 to get the SHAH ZEMANIYOS. 1.25 of these hours before SHKIA is Plag. For example: Sunrise is 5:24 and Sunset is 8:29. The morning has 6 hours and 36 minutes (from 5:24 to Noon) or 396 minutes. the afternoon has 8 hours and 29 minutes or 509 minutes. total of 396+509 is 905 minutes (15 hours and 5 minutes of daylight). Divide by 12.Each hour has 75.4 minutes. 75.4 x 1.25=94.25 or 1 hour and 34 minutes. 8:29 – 1:34 is 6:54 PM.
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