motion

The Sailor's Word-Book

Change of place; it is termed direct, in the sky, when it is in the direction of the earth's annual revolution; retrograde, when it proceeds contrary to these conditions; by sidereal is meant the motion of a body with respect to the fixed stars.


♦ Tropical motion is the movement of a body in respect to the equinox or tropic, which has itself a slow motion among the stars, as shown under precession. (See proper motion of the stars.)

♦ Motion, in mechanics, is either simple or compound, as one or more powers are used. The momentum of a moving body, or quantity of motion, arises from its velocity multiplied into the quantity of matter it contains.

The Sailor's Word-Book

← mothery   ×   motion, centre of →

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