Is it advisable to start any new venture or buy anything new on Amavasya day being Niranja Naal as per our Tamil Calender

Answer: It is depending on the work/job you start. Though for the Tamilians Amavasya is considered a good day to start events, it is not so elsewhere in India! No auspicious functions such as Vidyarambam, Upanayanam, Seemantham, Bhumsavanam, Marriage etc are taken on the Amavasya. However, for travel, entering new home, boiling milk in the new house etc. are considered good on this day.