Vastu Shastra is an ancient Hindu science of architecture that has been used for centuries to create structures that are in harmony with nature and make the optimal utilization of natural energies, light, and air. The principles of Vastu Shastra are based on the idea that different deities and elements rule different areas of a site. This means that the placement of certain elements must be considered in order to create a home or structure that is in harmony with nature. Vastu Shastra also provides a basic framework for making the best use of sunlight as it changes positions throughout the day. For example, the northeast direction is ideal for Puja room as this is the position the sun is in before dawn, during the auspicious Brahma Muhurta. Similarly, one must pay attention to where to place other rooms to make the best use of the light and heat of the sun. On a larger scale, the principles of Vastu Shastra have been used to shape the destinies of cities and nations. Japan, for instance, is a country surrounded by the sea and North and Northeast are ideal directions according to Vastu Shastra. This means that the placement of certain elements within the country must be done in accordance with the principles of Vastu Shastra in order to create a nation that is in harmony with nature and the environment.