Thai Amavasya or Thai Amavasai is the No Moon day in Thai month in Tamil calendar. In 2018, Thai Amavasya date is January 16.
Though on every amavasai, devotees offer Tharpanam to their dead ancestors, Thai amavasai is even more auspicious as it is the first Amavasya in Utharayanam.
Thai Amavasya is also known for Punya snana in Rameshwaram, Srirangam, Tiruchendur, and some other famous pilgrimages.
Thai Amavasya falls on Poushya Amavasya in Marathi, Gujarati, Kannada, and Telugu calendars; and on Magh Amavasya in North Indian Hindi calendars. It is also celebrated as Mauni Amavasya.
It is to note that the first day of Thai month is celebrated as Thai Pongal and Thai Pournami is celebrated as Thaipusam.
Thai Amavasai Tharpana Mantras
Hevilambinama samvathsare ,Utharayane , hemantha rithou, makara mase , Krishna pakshe, adhya amavasyam punya thidhou , bhouma vasara yukthayam, Poorvashada nakshatra yukthayam, shubhayoga, shubhaKarana evam guna viseshena, visishtayam asyam amavasyam punya thidhou, amavasya punyakale, darsa sradham , thilatharpana roopena adhya karishye
(Amavasya up till 2.49 AM next morning (Prathama afterwards) and Poorvashada Nakshtra up to 7.23 PM (afterwards Uthrashada))