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The Modified Julian Date used in astronomy is defined as being 2.4 million days (and a half) after the Julian Date epoch, with an epoch in the middle of the 19th century. Why was this number used? Why not more days or less?

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The Modified Julian Date used in astronomy is defined as being 2.4 million days (and a half) after the Julian Date epoch, with an epoch in the middle of the 19th century. Why was this number used? Why not more days or less?	1