acceleration

The Sailor's Word-Book

The increase of velocity in a moving body by the force of gravity. A planet is said to be accelerated when its actual diurnal motion exceeds its mean. In fixed stars the acceleration is the mean time by which they anticipate the sun's diurnal revolution, which is 3′ 56″ nearly.


♦ Acceleration of the moon is the increase of her mean motion, caused by a slow change in the excentricity of the terrestrial orbit, and which has sensibly diminished the length of the moon's revolution since the time of the earliest observations.

Related Words