According to Hindu's Vishwakarma God is the architect of the whole world. Vishwakarma Puja is been celebrated every year with great enthusiasm among all workers. This is the day on which almost all the factories is off, labour's have holidays, and puja is been arranged in the factories of all machines, vehicles, equipments.
How to do Vishwakarma Puja ?
Vehicles of general Hindu family is also washed, cleaned and then a prayer is done, for the well being of the vehicles.

In Andhra Pradesh Vishwakarma Puja (the Festival Day of Vishwakarma) is celebrated on 17th September at Exhibition Grounds Hyderabad and in some other places it will be celebrated a day after Diwali. The festival is observed primarily in factories and industrial areas, often on the shop floor.

Vishwakarma is known as the divine engineer of world. As a mark of reverence he is not only worshipped by the engineering and architectural community but also by all professionals. It is customary for craftsmen to worship their tools in His name.

Vishwakarma Puja is celebrated by all industrial houses, artists, craftsman and weavers. The festival is observed on the Kanya Sankranti Day (September) which follows the Ganesh Puja.

When is Vishwakarma Puja in 2009?
This year its on 17th September 2009. With the end of Pitrapaksh, the festive season will begin. 18th September is Pitri Amavasya and from 19th Navratra will begin. Durga Puja is been celebrated with great zeal and enthusiasm in north India, specially in Kolkatta, West Bengal.

After that Dusheera or called as Vijay Dashami , the day God Ram had killed Ravan, depicting the win of good over bad.

Then comes deepawali celebration. With the on set of Dhanteres, Rupchoudas, Diwali, Govardhan Puja ,Bhai duj.
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Vishwakarma is the "Principal Universal Architect", the architect who fabricated and designed the divine architecture of the Universe at the behest of Brahma, the Lord of Creation.