The Hindu calendar is not a single, unified system but a collection of regional calendars that vary across India. Two prominent examples are the Hindu North Indian Calendar and the Hindu Tamil Calendar. Here are the key differences between these two calendars: 1. Starting Points (Epochs) Hindu North Indian Calendar : Typically, it follows the Vikram Samvat or the Shaka Samvat. The Vikram Samvat begins in 57 BCE, while the Shaka Samvat starts in 78 CE. Hindu Tamil Calendar : Follows the Tamil calendar system which begins in 78 CE (similar to the Shaka Samvat but used in a different regional context). 2. Months Hindu North Indian Calendar : The months are generally based on the lunar cycle and named as follows: Chaitra, Vaishakha, Jyeshtha, Ashadha, Shravana, Bhadrapada, Ashwin, Kartik, Margashirsha, Pausha, Magha, and Phalguna. Hindu Tamil Calendar : The months are named differently and are based on solar months: Chithirai, Vaikasi, Aani, Aadi, Avani, Purattasi, Aippasi, Karthigai, Mar