Hours - Jewish Calendar
The hour has a special meaning in Jewish law. "The third hour of the day" doesn't mean 3:00 a.m., or three sixty-minute hours after sunrise. Rather, an hour in halacha is calculated by taking the total time of daylight of a particular day, from sunrise until sunset,1 and dividing it into twelve equal parts. A halachic hour is thus known as a sha'ah zemanit, or proportional hour, and varies by ...
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