A live version can be viewed here.
Leave "day" input-field blank to use currently displayed time. Date format : dDD/MM/YYYY eg: d17/05/2021 Or use a number for days relative to 17Jan 2015. Can be negative and/or a decimal number.
"'SatPANG' is the angle from the North Celestial Pole measured counter-clockwise (CCW, or east) to a line from primary/planet center to satellite center. Units: DEGREES (position angle)"