Vastu Shastra has been a part of the Indian culture for thousands of years. Even today people consult Vastu experts before buying a new property. Vastu Shastra has its origin in Sthapatya Veda which is a part of Atharva Veda.
The early principles were drafted according to the sun rays and their differing positions at different times of the day. In ancient times, this science was only confined to the architects, known as Sthapathis, and was passed on either verbally or through hand-written monographs. The significance of Vastu Shastra is established by the fact that in earlier days, the architecture of temples and palaces was completely based on it.
Vastu Shastra has also been mentioned in our ancient scriptures like the Mahabharata and the Ramayana. The architecture of the city of Ayodhya bears a resemblance to the plans mentioned in the Indian architectural text Manasara. Setu bridge built by Lord Ram was based on Vastu principles. The excavations at Harappa and Mohenjo-daro also indicate that Vastu Shastra had an influence on the Indus Valley Civilization.
According to Indian mythology, Vastu is an Asur (Demon) who prayed to Bramhadev and got boons. This, in turn, spurred an insatiable hunger in him. His power grew to such an extent that he attacked the Devas (Gods) in an attempt to consume their energies. The Devas then asked Bramhadev to help them get rid of this peril. Bramhadev asked the Devas to wage a war with Vastu. During the fight, Vastu was pushed back to Earth and he fell flat on his back with this legs pointing towards Nirrtikon and his head to the Eshankon. Bramhadev then asked the Gods to jump and sit on each organ of Vastu as this will be the only way he can be killed. Bramhadev himself sat on the middle of Vastu, and defeated and killed Vastu.
It is said that ‘The Vastupurusan’ still lies in the same position with his hands resting on his chest. The formation in which the Devas sat on Vastu was used to draft a grid diagram, which helps Vastu experts to decide favourable directions in a dwelling.
Even after thousands of years since its establishment, this science of direction remains to be very popular with people and many housing firms like Tata Housing adhere to it while designing their projects.