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Amavasai is the the first day of Sukla paksha, or the waxing phase of the moon. In the waning phase of the moon or Krishna paksham, this will be Pournami tithi.
A person born on the Amavasai tithi may hide his problems and difficulties from others. He is considerate and helpful to those who show understanding. But, an Amavasai born person is not to be had as enemy; he will be the end to his enemies. Overall, he will enjoy a good life.
Amavasai is ruled by Rahu, division is Purna, deity is Pitas. If Amavasai falls on a thursday, it is considered an auspicious day.
It is said that worshipping a Budhan rupam is auspicious on Ashtami and Amavasai to destroy remove the evil effects of Rahu.