Q. Why is the Jewish calendar based on the moon and not on the sun like most others?

A. See
answer above. See also article on the constant renovation of the
universe at BDYC weekly parsha
“That is” article (Vaera and Bo).Rabbi A. Bartfeld as revised by, Horav Dovid Pam, Horav Aharon Miller, Horav Chanoch Ehrentreu and Horav Kalman Ochs Shlit’a