List of all Hindu festivals in September , 2025 holidays & daily panchang. Bhadra and Asvina are the lunar months corresponding to September . Ashvina month 2025 starts on September 8. Hindu calendar September 2025: Daksinayan, Sharad ritu, Vikram samvat 2082, Bhadrapada Sudi Navami to Ashvina Sudi Ashtami. Sep 28, 2018 · While in the Gregorian calendar, the individual months vary in length to accommodate the difference between the lunar cycle and the solar cycle, with a "leap day" inserted every four years to ensure that a year is 12 months long, in the Indian calendar, each month consists of two lunar fortnights, beginning with a new moon and containing exactly two lunar cycles..