The Earth spins around on its North-South axis and is tilted from the axis towards the North by about 23 ½° at the meridian. With the Sun rising in the East - it makes the North-East very important. Cosmic energy is received from this direction in abundance (Vitamin D too) and it is in its purest form. This energy flows out in the opposite direction - the South-West.

The Sun moves on the Northern portion of the Earth for six months (Dec 21st to Jun 20th or Jan 14th to Jul 15th according to the Vedic calendar) and in the Southern portion for the next six months (Jun 21st to December 20th or Jul 16th to Jan 14th according to the Vedic calendar). The daylight time will be more when the Sun is in the Northern portion and the night time is less. It is the contrary when in the Southern portion. Thus there is more light in the North than in the South.

  
     
     
  Due to these reasons more windows, door and balconies are prescribed on the Northern and Eastern side. The ground level should be lower here and obstacles must be removed so that the rays of the morning sun could enter the structure. The morning rays emit less heat and more light (ultra-violet). Water source/storage is ideally located towards North and East for the Sun to cleanse the water. Trees or foliage as a screen on the Western and Southern sides are recommended - for protection from the afternoon sun (infra-red). It also helps in regulating the supply of oxygen. Summer winds (usually from the South and West) collect moisture - from the trees before entering the house making it more tolerable.  
     
     
  The energy while going from the North-East to the South-West does not flow in a straight line. It divides itself in the middle with one half flowing to the South-East and the other half to the North-West. The energy is 'warmer' on the South-East side as it flows.

If the Thermal Concept is applied, it appears that water raises in temperature when it passes from North-East to the East and 'boils' when it reaches the South-East. Contrary to it, water remains virtually the same temperature when it passes the from the North-East to the North-West. Similarly, humidity also increases from North-East to South-East and decreases towards North-West and South-West.

  
     
     
  An ideal method to block this cosmic energy and absorb it as bio-energy would be to block the South-West or raise the level of ground. I assume the kitchen is recommended in the South-East for its thermal properties and the bedroom in the South-West to facilitate absorption of these energies.

To facilitate even flow of energies, a square plot would be ideal. The pyramid whose base is a square is believed to have the best geometry to tap and transmit cosmic energy. Rectangular plots would stretch energy lines.

The direction to which the plot faces is not important - though sometimes North and East are considered auspicious. But the levels of ground in each of the directions within the plot are important. Ideally the East should be lower than the West and the North should be lower than the South. (You must have reasoned out the logic of this by now) Correction of the levels is required before any construction.

Correction is also required if the plot is not a perfect square or a rectangle. Such plots cause energies to flow unevenly. It can be corrected by sacrificing the extra area and by redrawing your boundaries. It would be easier this way than encountering problems later - even at the cost of expensive real estate. However, a projection to the North-East is acceptable.

If any natural source of water is present in the plot, it must be in the North-East. It might have to be closed otherwise.

In a larger perspective you will notice that prosperous locations such as Japan, Hong Kong, Singapore and New York all have natural sources of air and water to the North-East.

Study the chart below - before we go any further -

  
     
 
         
 
North West
Source of change in course of business, friendship and enmity
North
Source of Wealth

North East
Source of health, wealth and prosperity

  
 
West
Source of name, fame and prosperity
East
Source of knowledge, prosperity
  
 
South West
Source of Character, behaviour, cause of longevity
South
Source of Death
South East
Source of Fire (health, cooking and food)
  
         
 
     
  Air in the North-East and Fire in the South-East maintain the flow of energy. The North needs to be kept open as a source of wealth and the East opens out for wisdom to enter. It would be best to keep the South closed to keep happiness from flowing out. Similarly the West needs to be covered.

The magnetic fields of the planet also have a significant effect on us. The human body is considered to have an inherent polarity with the head acting as the North Pole. Thus if while sleeping, your head is directed towards the north, it will repel the field of the earth's pole. It is recommended to sleep with the head to the South.