The first Calends of the Julian Calendar

This work is proposing an archaeo-astronomical study of the Julian calendar, a reform of the Roman calendar proposed by Julius Caesar. The calendar was inaugurated on the first of January, 45 BC (historical date). Using astronomical software CalSKY, we can investigate if the first day of this new system of organizing the days was corresponding to a Calenda, that is, to a day of new moon. It was on January 2, 45 BC (Julian day). We can also see how the new calendar adapted itself to the following phases of the moon.

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