The Egyptians got the Month right.

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>deeply study the Rhind Papyrus, an ancient Egyptian mathematical document ca. second intermediary period

>They made numerous mistakes and were mostly interested in practical considerations, but they also had certain slight theoretical interests

>but in particular, they explicitly understood that a common year is equal to 365 days, and in the Rhind Papyrus we have a primary document explicitly making that ancient Egyptian understanding perfectly clear, at least ca. the time of its writing (and perhaps ca. the time of the writing of its lost, supposed source material)

>moreover, they divided the common year as follows: 12 months of 30 days each, and 5 "extra" (so-called epagomenal) days, (to which moderns could easily add the leap days as needed near the end of a calendar year)

>the cycle of of the moon is just-plain not commensurate either with the natural human inclination towards bases of five-or-ten (or easy multiples of same, e.g. 30), and with the days of the year. The notion of a "month" either directly tied to the moon or slightly apart from it is also a very tangible concept for humans, a passage of time in which certain essential information can be learned, a routine can be established, a short-term process can flow, as it were - which is why the month is such an obvious concept for everybody, plus or minus a few days

>some arbitrary retarded "thirty days has september.... leap day in february"... gregorian bullshit is devised later

>we don't just follow the Egyptian convention

One thing that the Egyptians got one hundred percent correct straight out of the gate was the basic daily calendar conception of the year. We should go back to it.