What's Your Seat Angle?

What seat angle are you riding? That's a complex question, writes bike fitting guru Dan Empfield from Slowtwitch.com. "In the best of all worlds, one would find one's apparent seat angle through some sort of variable position simulator (fit bike); then select a saddle that allowed one to ride with a flattish back comfortably; then calculate where on that saddle one would ride; then place under the saddle a theoretical seat post of a desired sort; then be able to determine the seat angle of the ideal bike."