There is a nice shareware program called Homeplanet I discovered several years ago. I am still using it 15 years later. I also sometimes use Stellarium for locating objects in the night sky cuzit is more "lifelike". Both are freeware.
If you designed your ductwork to maintain a constant supply air VELOCITY, this method is called "static regain". This maintains a CONSTANT static pressure in all segments of the duct. Hence, all 360 terminals have the full system static pressure available on the duct side. The individual...