Important holidays include Diwali, Holi, birthday of Lord Rama, Shive Ratri, Kumbh Mela, Ganesha, Dassera, and Navarati. According to the Hindu calendar, a lunar year consists of 12 months. A lunar month has two fortnights, and begins with the new moon called "amavasya". The lunar days are called "tithis". Each month has 30 tithis, which may vary from 20 - 27 hours.