The motion of a celestial body on the celestial sphere. Generally, this refers to the diurnal motion of the Earth, excluding the Earth's rotation. It is expressed as an angle, and the true momentum is obtained by multiplying it by the distance from the observer. Apparent motion is important for celestial bodies within the solar system, such as the Sun, planets, moons, and comets, but the apparent motion of celestial bodies outside the solar system is minute. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
天球上の天体の運動。一般には,地球の自転による日周運動を除いたものをさす。角度で表わされ,観測者からの距離を乗じれば真の運動量が得られる。視運動が重要視されるのは,太陽,惑星,衛星,彗星など太陽系内の天体の場合で,太陽系外の天体の視運動は微小である。
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