I am calculating the corrected image circle for the APASS systems, based on the patterns I see on the flatfields. I have marked x,y positions for four points on each of the OTA images, and would like to find the radius and center coordinates of the circle that passes through these points. Anyone want to make the calculation?
C3B
409,3767
3657,455
3737,3519
289,447
C4V
337,3687
3785,3767
3769,311
297,295
I may need to do this for another pair of circles sometime later, so don't throw away your code!
Arne
Links:
[1] http://www.aavso.org/forums/about-aavso/software-development
