The climatological laws of vastu were very simple and based on observations of many ancestral generations.

Southwest-Based on heating due to undesirable summer sun, desert winds and plate tilt-It was an unfavorable direction.
Brahmsthaan-Enhanced privacy & cross ventilation.
Kitchen in Southeast-Leeward wind side dispels smoke prevalent in ancient cooking methods.
Golden section was also seen as a factor in vastu designing & orientation.