Apparent.

Apparent. This term is used to express a number of important distinctions, especially in astronomy. The apparent magnitude of a heavenly body is the angle formed by two lines drawn from the ends of its diameter to the spectator's eye; this obviously depends upon the distance of the body, as well as upon its real magnitude. A planet seen from the surface of the earth seems lower than if seen from the centre of the earth—the former is its apparent altitude, the latter its real. Apparent noon is when the sun is on the meridian; true or mean noon is the time when the sun would be on the meridian if his motion in the heavens were uniform and parallel to the equator (see the article DAY). The daily and annual motions of the sun in the heavens are both apparent motions, caused by two real motions of the earth.