NATS 1745 Lecture Notes - Lecture 4: March Equinox, Lunar Phase, Islamic Calendar
22 Feb 2019
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Days: rotation of the earth is from midnight to midnight, not actually one full rotation as the earth is also orbiting around the sun, approx. 1 degree short: another problem is when to define day as starting", in many ancient cultures this was taken to be sunrise or sunset. Thursday, may 17, 2012: has practical problems from the modern stand point, so the start" of a day is set to midnight. In their assumed order they would have been moon, mercury, Christian religions, with god creating the earth in six days and resting on the seventh (though the hebrews may have picked this and other traditions up from the babylonians in their captivity there. Months: clearly based on the phases of the moon. Years: problem with the year is that there are different ways to measure its length, and these numbers are not exactly the same.
