THE MONTHS OF THE JEWISH YEAR - החודשים בלוח השנה היהודי

THE MONTHS OF THE JEWISH YEAR
החודשים בלוח השנה היהודי
The Jewish calendar is based on three astronomical phenomena: the rotation of the Earth about its axis (a day); the revolution of the moon about the Earth (a month); and the revolution of the Earth about the sun (a year). These three phenomena are independent of each other, so there is no direct correlation between them. On average, the moon revolves around the Earth in about 29½ days. The Earth revolves around the sun in about 365¼ days, that is, about 12.4 lunar months.
The Jewish calendar has the following months:
Hebrew English Length Civil Equivalent
Nissan 30 days March-April
Iyar 29 days April-May
Sivan 30 days May-June
Tammuz 29 days June-July
Av 30 days July-August
Elul 29 days August-September
Tishri 30 days September-October
Cheshvan 29 or 30 days October-November
Kislev 30 or 29 days November-December
Tevet 29 days December-January
Shevat 30 days January-February
Adar 30 days February-March

Useful link: http://www.ou.org/holidays/calendar/