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Pournami is the fifteenth tithi beginning Amavasai, in the waxing phase of the moon [Sukla paksham], or the first day in the waning phase of the moon [Krishna paksham]
The Pournami day in Karthigai is a very sacred day. Karthigai is a month where Lord Shiva and Vishnu are both celebrated and worshipped. Karthigai Pournami is also one of the days when the temples of Lord Shiva and Lord Vishnu are overflowing with devotees. There are certain temples which are special, because both Siva and Vishnu deities are present in the same temple.
Those that are born on the Pournami tithi will be keenly interested in science and technological studies, such as electronics and other subjects.
Their work and their skills are the source of their becoming famous in their fields. They are polite and thus earn a good reputation among others. They are natural leaders and have leadership positions come to them.
Those that are born on Pournami will have long hair and may live a long and successful life.
Pournami is ruled by Shani, division is Purna, deity is Vishvadevas. Fasting on Pournami will make one truthful; it removes the negative effects of Shani. If Pournami falls on a thursday, it is considered an auspicious day.
Karthigai Pournami is also called Deva Deepavali. Kathigai Pournami is also celebrated as the day of incarnation of Vishnu as Matsyavataram.