QUADRANT n.
the reflected image of the sun coincides, to the observer's eye, with the horizon as seen directly through an opening at the side of the horizon glass, the index shows the sun's altitude upon the scale; -- more properly, but less commonly, called an octant. -- Quadrant of altitude, an appendage of the artificial globe…
RADIANT a.
as in the case of light and radiant heat. -- Radiant heat, proceeding in right lines, or directly from the heated body, after the manner of light, in distinction from heat conducted or carried by intervening media. -- Radiant point. (Astron.) See Radiant, n., 3.
RIGHT-ABOUT n.
A turning directly about by the right, so as to face in the opposite direction; also, the quarter directly opposite; as, to turn to the right-about. To send to the right-about, to cause to turn toward the opposite point or quarter; -- hence, of troops, to cause to turn and retreat. [Colloq.] Sir W. Scott.…