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The early principles of Vastu were framed on the basis of observation of the sunrays at different durations during the day. Vastu study has incorporated the principles of sculptures, construction and architecture, as were described in the epics. One can find its mention in different epics like Mataysya Purana, Skanda Purana, Agni Purana, Garuda Purana, and Vishnu Purana.
References can also be found in the Mahabharata; of different houses built for the kings, which were constructed following Vaastu guidelines. Even Buddhist literature makes numerous mentions of different buildings based on Vaasthu. It has become a tradition of passing the knowledge of Vastu shashtra from one generation to another.



