I am researching the kings of Judah and Israel and realized that the Hebrew year and the Gregorian year may be different. I know the mean length of the Gregorian year (365.2425 days), but I do not know the length of the Hebrew year. So I come here to find out. What is the mean length (in days) of a Hebrew year, to seven significant digits, like I've shown for the Gregorian year? (In case you don't know, when I say "mean" I am saying "average").