Vaastu Shastra is incomplete without astrology. In fact, vaastu should not be done without considering the owners birth, date and time, planetary position and the date on which one signs the agreements to buy the property according to the thumb rule of vaastu, north and east are considered to be auspicious directions and south and west are considered inauspicious and negative directions. This means that people who have their house and office facing north and east should always prosper and lead a peaceful life and people who have their house and office facing south and west should always suffer and face failure in life. However, in reality, this does not happen. This is where astrology comes in. It is your planets which decide your lucky and unlucky directions (fortune and misfortune) and not the thumb rules of vaastu.