Vaastu Shastra is the science of direction which combines all the five elements of nature and balances them with man and resources.
It is all about the relations of various forms to provide best effects on a living person. It aims to create a fine conducive atmosphere in a structure where we live and can bring enhanced health, wealth, prosperity and happiness in an enlightened environment.
The Scientific approach
Vastu Shastra is a scientific approach which comprises five natural elements: Earth, Water, Fire, Air and Space.
Each of these elements corresponds to a natural force which affects our lives. Our ascendants were great scientists and they understood the effect of the natural forces on the human lives.
They are:
Earth: Magnetic field of the earth
Water: Gravitational attraction of the Earth
Fire: Solar radiation
Air: Wind energy
Space: Cosmic radiation
Like any other science, Vaastu is universal, based on reason, practical and useful. It is not a religious belief, but is a science.
Vaastu helps to increase the worth of life, and does NOT interfere with the fortune!
Simply it means assume a balcony in any Apartment/House is built perfectly as per Vaastu Shastra. Unfortunately, a person living in that House/ Apartment, jumps off that balcony! He or she may die or survive, that is fortune!
Vaastu Shastra is a combination of Five Basic elements these are:
Earth (Prihvi): Magnetic field of the Earth:
The earth is the basis of life and we live in an earthen environment. Both the earth and our body have magnetic properties.
Scientists have proved that earth is a huge magnet with two poles North and South. As like human Head is North and feet are South.
As in magnetic rule opposite poles attract each other and same poles repels each other. Sleeping With the heads towards South direction supports a healthy and peaceful sleep whereas head towards North will not.
Water (Jal): Gravitational attraction of the Earth:
It is the most important element which is attached to our senses of taste, touch, sight, and hearing. More than 75% of our body and 2/3rd of earth surface is occupied by water. The correct positioning of water sources like well, bore well, underground water tank, overhead water tank influences the quality of the life and the achievement in any work.
Fire (Agni): Solar radiation: 
Fire represents the energy of light and heat. Origin of Fire element is the Sun. The Sun rays are the combination of 7 plus 2 Colors. In Vaastu, the correct positioning of heating outlets and Kitchen are important because auspicious usage of the fire element in house as well as in office improves the wealth and prosperity. It is suggested by Vaastu Shastra that having a tall or big trees in the South direction will reduce the harmful effects of Sun rays
Air (Vayu): Wind energy:
The air element is ostensible by the sense of touch and feel. Air element is related to architectural factors such as climatic conditions, proper placements of doors, windows, ventilators, balconies, height of structure, placement of trees and plants for balancing the Air element within the house structure.
Space (Aakash): Cosmic radiation
In Vaastu, the space element is with a complex inner structure that influences everything inside it. The space is infinite and never ending. In Vaastu, the space element is very important because it’s characteristic influences on the eight directions upon the space element in your house. Open space both in house and plot must be carefully considered and positioned.
These five Basic elements are also present in our body which are related to our five senses: Smell (Gandh), Taste (Chav), Hearing (Dhvani), Touch (Sparsh) and Sight (Drashti). Any inequality in our internal Vaastu leads into unhappy situations.
According to the traditional knowledge, the entire universe is made up of these five basic elements. In reality, these five elements of the nature have to be matched with the five elements of the human body as well.
This coordination is what makes human relationship pleasant. And perhaps the Vaastu Shastra help us to makes the matching with nature’s Five Basic elements in our living house.