POLAR a. 4 definitions
s, each at a distance from a pole of the earth equal to the obliquity of the ecliptic, or about 23º 28', the northern called the arctic circle, and the southern the antarctic circle. -- Polar clock, a tube, containing a polarizing apparatus, turning on an axis parallel to that of the earth, and indicating the hour of…
POWDER n. 7 definitions
Zoöl.), a tuft or patch of powder-down feathers. -- Powder hose, a tube of strong linen, about an inch in diameter, filled with powder and used in firing mines. Farrow. -- Powder hoy (Naut.), a vessel specially fitted to carry powder for the supply of war ships. They are usually painted red and carry a red flag. --…
PRECESSION n.
annually, caused by the action of the sun, moon, and planets, upon the protuberant matter about the earth's equator, in connection with its diurnal rotation; -- so called because either equinox, owing to its westerly motion, comes to the meridian sooner each day than the point it would have occupied without the motion…