Just what are the numbers in the log file? What units are they?
A. PHD deals in pixels (distance), seconds or milliseconds (time), and radians (angles). It never needs to know things like how long your focal length is because it only works in units that can be directly observed – how far the star moved in pixels in a given amount of time. Thus, we have:Frame: Counter telling you what image it was, starting at 1 Time: Time since the start of the run, in seconds dx: Distance the star was from the lock position along the camera’s X-axis, in pixels dy: Distance the star was from the lock position along the camera’s Y-axis, in pixels Theta: Angle formed by creating a line from the lock position to the star position, in radians RA_Dist: Projection of the vector from lock to star position onto the RA axis (as determined in the calibration stage).
