The chariot the rite is named forpan-Hindu
The name is the reason for the rite. A bhima-ratha is a fearsome chariot, and the seventieth year is spoken of as the year one comes within its reach; the shanti is performed to turn it aside. Nothing in the occasion refers to the Mahabharata's Bhima, though the similarity of the names invites the mistake, and the mistake is common enough to be worth naming.