Dear Mr Lee, I'm very interested in the current topic and had self-study a bit through library books and Internet topics, but the more I researched, the more confused I am. I'm very glad that I had found this web as I'm very impressed with the fact that you and the other moderators take time and effort to explain clearly on almost all questions asked. Most importantly, had answered with reliable and clear answers. Your help will be greatly appreciated. Questions: 1. Are the positions i.e fixed according to the house facing direction? Or it constantly changes throughout the years? I.e, differen
