# Mean-motion sentence example

mean-motion
• Eight times the mean motion of Venus is so nearly equal to thirteen times that of the earth that the difference amounts to only the 2.
• Instead of the period it is common in astronomical practice to use the mean angular speed, called the mean motion of the body.
• It follows that putting n for the mean motion and T for the period of revolution we shall have in degrees nT=3600.
• In these cases therefore the mean distance and mean motion are regarded as different elements, and the whole number of the latter is seven.
• Putting a for the mean distance of the earth from the sun, and n for its mean motion in one second, we use the fundamental equation a3 n2 = Mo-1-M', Mo being the sun's mass, and M' the combined masses of the earth and moon, which are, however, too small to affect the result.
• For the mean motion of the earth in one second in circular measure, we have n 8149' l o g.
• The moon's apparent mean motion in longitude seems also to indicate slow periodic changes in the earth's rotation; but these are not confirmed by transits of Mercury, which ought also to indicate them.
• The motions of individual stars, it is true, vary widely, but if the mean motion of a number of stars is considered this tendency is always to be found.
• Accordingly this mean motion of the stars relative to the sun has been more generally regarded from another point of view as a motion (in the opposite direction-towards the constellation Lyra) of the sun relatively to the stars.
• Having determined the motions of the two drifts, and knowing also that the stars are nearly equally divided between them, it is evidently possible to determine the mean motion of the drifts combined.