Patent ID: 8642937

Claim:
A device for calibrating an optical payload comprising: the optical payload configured to orbit a planet, a housing having an optical aperture, at one portion of the housing, for passing light to an imaging device, and including at least one adjustable door in a closed position, at another portion of the housing, for receiving and directing light toward the optical aperture, wherein the door includes a plurality of holes, fixedly formed in the door, configured to pass light into the housing, when the entire housing is moved to a predetermined angle relative to the sun, each hole is formed by a fixed circular wall in the door, and each hole is fixedly formed through the door and cannot be adjusted, the holes are spaced apart from each other by at least one fixed distance and the holes are arranged across the door in at least one fixed pattern, and the holes are configured to pass light into the housing without reflecting off the walls that form the holes.