the language itself is Hebrew," Ratson said ... Unlike the imperfect lunar calendar that depended on human observation and discretion, their calendar was perfect because it was strictly mathematical.

Tonight, on the 14th day of the Hebrew month, we are on a mission ... calendar adopted by most of the world, the Jews use a lunar calendar, balanced by corrections to account for the earth ...

Because the Hebrew calendar is based on lunar months, that means the exact dates of Adar, and of Purim, change on the Gregorian (solar) calendar each year. The name “Purim” means “lots” in ...