September = '"seventh month"
October = "eighth month"
November = "ninth month"
December = "tenth month"
It's pretty clear the calendar used to start on March 1st. I'm guessing March first was originally at the spring equinox, the annual equivalent of dawn, and not near the winter solstice, the annual equivalent of midnight.
Going way, way, way out on a limb, I assert (with absolutely no solid evidence!) that Jesus was born on the 1st of March, that is to say the man who's symbol was a fish was born a Pisces!
It makes sense that the most singular event in history, the start of a new era, would coincide with the start of a new year.
In like a Lion (of Judah), out like a Lamb (of sacrifice)...
The year started on the Ides of March.
http://www.freerepublic.com/focus/chat/3697309/posts?page=28#28
Jesus is said to have been conceived on March 25, “Annunciation Day.” It was once celebrated as New Year’s Day:
https://www.daytranslations.com/blog/2013/01/march-25-was-the-new-year-once-upon-a-time-2-305/