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Of or pertaining to the planets; as, planetary inhabitants; planetary motions; planetary year.

Between planets; as, interplanetary spaces. Boyle.

xis; amounting when greatest, in the former case, to 20.4'', and in the latter, to 0.3''. Planetary aberration is that due to the motion of light and the motion of the planet relative to the earth.

In the direction of the general planetary motion, or from west to east; in the order of the signs; not retrograde; -- said of the motion of a celestial body. Direct action. (Mach.) See Direct-acting. -- Direct discourse (Gram.), the language of any one quoted without change in its form; as, he said "I can not come;" -…

hun. -- Kepler's laws (Astron.), three important laws or expressions of the order of the planetary motions, discovered by John Kepler. They are these: (1) The orbit of a planet with respect to the sun is an ellipse, the sun being in one of the foci. (2) The areas swept over by a vector drawn from the sun to a planet a…

act of going before, or forward. Lunisolar precession. (Astron.) See under Lunisolar. -- Planetary precession, that part of the precession of the equinoxes which depends on the action of the planets alone. -- Precession of the equinoxes (Astron.), the slow backward motion of the equinoctial points along the ecliptic,…

ich encounter the earth in its annual revolution, and which become visible by coming with planetary velocity into the upper regions of the atmosphere. At certain periods, as on the 13th of November and 10th of August, they appear for a few hours in great numbers, apparently diverging from some point in the heavens, suc…