In advanced cultures like we see in Asia more than one calendar operates simultaneously. For the Lunar Calendar (the most “important” one) we say something like: “The new moon closest to the Aries ingress is the beginning of the year.” For the Solar Calendar (the one farmers and most common people use most often) we say something like: “The day of the ingress to Aries starts the year.”
There are a few variables that are options. Communities decide upon as they like:
(A) New moon, or full moon for months?
(B) Equinox or solstice for years?
If we choose the equinox we choose the ascending equinox (Aries). If we choose the solstice we choose the ascending solstice (Capricorn).
This is why you have several varieties of valid calendars, and several concepts of when years and months start and end.
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