Initial Conditions: A Physics History Podcast cover image

The Legacy of Ptolemy’s Almagest

Initial Conditions: A Physics History Podcast

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How to Know When to Pray

Afternoon prayer was a complex prayer because that was supposed to be defined by the time when your shadow is equal to your height. When Islam started spreading, there are people worshiping at different latitudes in Mecca where the sun wouldn't cast the appropriate angle for measuring by shadow. So how could you know when to pray? You have to know prayer required that you really have to know the latitude that you are on and that's mathematical geography now. And then you have to know where is your locality on the ground with respect to the movement of the sun on this ecliptic around us. What is your mathematical geography or elementary astronomy? Talmi had already answered these questions in the al

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