REFRACTION n. 2 definitions
The change in the direction of a ray of light, and, consequently, in the apparent position of a heavenly body from which it emanates, arising from its passage through the earth's atmosphere; -- hence distinguished as atmospheric refraction, or astronomical refraction.
SHADOW n.
Shade within defined limits; obscurity or deprivation of light, apparent on a surface, and representing the form of the body which intercepts the rays of light; as, the shadow of a man, of a tree, or of a tower. See the Note under Shade, n., 1.
SHOOTING a.
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, such displays being known as meteoric showers, or star showers. These bodies, before encountering the earth, were moving in orbits closely allied to the orbits of comets. See Le…
SIDEREAL a.
Measuring by the apparent motion of the stars; designated, marked out, or accompanied, by a return to the same position in respect to the stars; as, the sidereal revolution of a planet; a sidereal day. Sidereal clock, day, month, year. See under Clock, Day, etc. -- Sideral time, time as reckoned by sideral days, or, t…