A little bit from history, and wiki

Hey, so i am doing some research regarding proper date conversion from excel to python datetime object and had found myself digging deeper and deeper into explanations of how Julian day system works, what it means and how it is translated into today, there a quote that had made itself quite interesting to me:

Julian days begin at noon because when Herschel recommended them, the astronomical day began at noon. The astronomical day had begun at noon ever since Ptolemy chose to begin the days in his astronomical periods at noon. He chose noon because the transit of the Sun across the observer’s meridian occurs at the same apparent time every day of the year, unlike sunrise or sunset, which vary by several hours.

See more: WIKI>Julian_day

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