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STAR FIELD OBSERVATION APPARATUS HAVING RETICLE WITH EXPONENTIALLY VARYING OPTICAL TRANSMITTIVITY AND MIRROR SWEEPING THE STAR FIELD ACROSS THE MIRROR AT EXPONENTIALLY VARYING VELOCITY
STAR FIELD OBSERVATION APPARATUS HAVING RETICLE WITH EXPONENTIALLY VARYING OPTICAL TRANSMITTIVITY AND MIRROR SWEEPING THE STAR FIELD ACROSS THE MIRROR AT EXPONENTIALLY VARYING VELOCITY