P. Kenneth Seidelmann, ed. (1992). Explanatory Supplement to the Astronomical Almanac. էջ 577. «For convenience, it is common to speak of a lunar year of twelve synodic months, or 354.36707 days.» (which gives a mean synodic month as 29.53059 days or 29 days 12 hours 44 minutes and 3 seconds)
