Starry Sky Stacker reduces noise in pictures
of the night sky that are captured as a sequence of exposures using an equatorial mount or some other mechanism that
ensures that stars move very little either during or between exposures. Starry Sky Stacker aligns the images to
compensate for errors in tracking,
assigns a quality estimate to each image, allows the user to select images based on the quality estimate, and finds the median. The resulting image has much less noise than any of the original images.