The following quoted from the art of fengshui website
Prosperous Stars ( #8, #9, #1 )
Locate these corners with prosperous stars and activate them correctly to harness the beneficial Qi.
5 Yellow Star ( #5 )
5 Yellow, a misfortune star has arrived in the Northeast Sector for year 2007. It is one of the most dangerous star that indicates accidents, illness and just bad luck all round. Do not attempt any groundbreaking, renovation or drilling in this sector as you will disturb the 5 yellow. An auspicious time and date selection must be given to perform these activities.
If your main door or bed is positioned in the sector, you will need to weaken its negativity with Metal cures
For professional Level only :
With an auspicious date selected, that combines both Heaven Qi and Earth Qi, one can revolve 5 yellow poisons into medicine and enhance human luck in the Northeast Sector.
7 Robbery Star ( #7 )
An inauspicious star located at North Sector this year, brings gossip, accidents, financial losses, burglary and robbery. Do not activate this sector and avoid placing metal element in this sector.
Three Killing occupies 75 degree of a compass reading ( 5 mountains ) in the West Sector. Without proper time given, do not attempt any groundbreaking in this area as it can bring misfortunes like financial loss, injury and sickness.
Grand duke Jupiter ( Tai Sui )
Grand duke, that occupies 15 degree of the Northwest sector ( NW 3 ) should not be disturbed at any cost. It will experience defeat, obstacles and loss if you confront it with activites like groundbreaking.
Do not sit and face towards this direction in your office. As an alternative, sit with your back towards this direction for support.
Age Break ( Sui Po )
Age Break occupies 15 degree of Southeast sector ( Opposite Grand duke Jupiter ). Do not attempt any groundbreaking.
A good night as well.