Swamy Namaskaram!!
As there are differing views existing and rules being followed; request to clarity the rules and procedure to do Grahana Punyakaala Tharpanam based on Veda/Sasthra sampradayam :

1. For Chandra Grahanam and for Soorya Grahanam when to do Tharpanams and Snanams?
2. Alsi What is the significance of Aaramba, Mathyama and Motsha punya khaalams?

Adiyean Srinivasan.