 In the Hindu calendar dates are usually prescribed according to the lunar calendar.In vedic timekeeping, a tithi is a lunar day.Among major festivals are Diwali, Gudi Padwa, Pongal, Holi, Ganesh Chaturthi, Raksha Bhandan, Krishna Janmashtami, Dasara or Dussehra, which may refer to the ten days of Sharada Navratri or the tenth day, Vijayadashami.