The text from the Kalendar gives a great description of the nature of March as seen in the Jacobean era. We are still in Pisces
The next section of the Kalendar gives a comparison between the ages of man and the months of the year. Twelve months in a year, Twelve ages of man in six year blocks. So March represents ages twelve to eighteen, as it says time to learn doctrine and science.
I introduce the Kalendar of Shepherds on this page.