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camera lucida - An optical device consisting of an attachment that enables an observer to view simultaneously the image and a drawing surface for sketching it. More...
horoscope - Comes from Greek hora, "hour, time," and skopos, "observer." More...
obverse - Its first meaning was "turned towards or facing the observer." More...
zenith, nadir - Zenith derived from Arabic samt ar-ras, "the way or road above one's head"; zenith technically is the point directly above the observer and nadir is the point directly below. More...