Kurma Avatar Story
According to legends, Lord Vishnu can be seen as a turtle in this incarnation which has been related to Samudra Manthan, i.e, the battle between Devas and Demons that took place in the sea. It is believed that during the reign of Bali, the demons were very powerful and also had the powers of Shukracharya.
The Devas were not able to fight them as Lord Indra was cursed by Saint Durvasa and was powerless. Taking advantage, Bali established his kingdom in all three lokas and the devas were wandering helpless.
All devas went to Lord Brahma and asked for help. Lord Brahma along with all the devas, visit Lord Brahma ad tell him about the problem. Lord Vishnu suggests about a battle which would take place in Kshir Sagar. During this battle, the devas would consume Amrit (Holy water). They would be immortal and would be able to kill the demons.
The devas agreed to this battle as suggested by Lord Vishnu. They chose Mandaranchal parvat as the centre and Nagraj Vasuki as the rope. They took the Mandaranchal parvat to Kshir Sagar but it started drowning as soon as it was left there.
During this time, Lord Vishnu incarnated as Kurma and lifted Mandaranchal parvat on his back. Thus, the battle between the Devas and the Demons could be completed.
Significance of Kurma Jayanti
The day on which Lord Vishnu incarnated as Kurma is celebrated as Kurma Jayanti. This day is considered to be very important according to the Shastras. Starting construction works on this day is considered to be very auspicious as it is believed that Yogmaya resides with Kurma. This day is also auspicious for works related to Vastu, shifting in a new house etc.