ANGULAR CRAB. An ugly long-armed crustacean--the _Goneplax angulata_--with eyes on remarkably long stalks. ANGULAR DISTANCE. This term, when applied to celestial bodies, implies that the sun and moon, or moon and stars, are within measuring distance for lunars. ANGULAR MOTION is that which describes an angle, or moves circularly round a point, as planets revolving about the sun. ANGULAR VELOCITY. This is a term used in the orbits of double stars, and implies the motion in a certain time of one star round the other. ANILLA. A commercial term for indigo, derived from the plant whence it is prepared. [Sp. _anil_, indigo, Indigofera; _alnyl_, Arab.] ANIMAL FLOWERS. _Actiniæ_, or sea-anemones and similar animals, which project a circle of tentacula resembling flowers. Formerly they were all classed under zoophytes. ANIMATE. The giving power or encouragement.--_To animate a battery_, to place guns in its embrasures.--_To animate a needle_, to magnetize it.--_To animate the crew_ in various ways for any special duty. ANKER. An anker of brandy contains ten gallons. The kegs in which Hollands is mostly exported are ankers and half-ankers. ANKER-FISH. A name of a kind of cuttle-fish. ANKLE-BONE. An old seaman's term for the crawfish. ANNELIDS. A class of worm-like animals, of which the body is composed of a series of rings. ANNET. A sea-gull, well known in Northumberland and on the northern coasts. ANNIVERSARY WINDS. Those which blow constantly at certain seasons of the year, as monsoon, trade, and etesian winds. ANNONA. An ancient tax for the yearly supply of corn or provisions for the army and capital: still in use in Italy. ANNOTINÆ. The ancient Roman victuallers or provision vessels. ANNOTTO (_Bixa orellana_). The plant from the dried pulp of the seed-vessels of which a delicate red dye is obtained, used to give a rich colour to milk, butter, and cheese. ANNUAL. Those astronomical motions which return or terminate every year. ANNUAL ACCOUNTS. The ship's books and papers for the year. ANNUAL EQUATION. An inequality in the moon's march, arising from the eccentricity of the earth's orbit, whereby the diurnal motion is sometimes quicker and at other times slower than her mean motion. ANNUAL PARALLAX. _See_ PARALLAX. ANNUAL RETURNS. In addition to the general accounts of the year, there are three returns to be transmitted to the admiral or senior officer for the Admiralty. They are, a report of the sailing and other qualities of the ship; state of the ship as to men; and progress of the young gentlemen in navigation. ANNUAL VARIATION. The change produced in the right ascension or declination of a star by the precession of the equinoxes and proper motion of the star taken together. Also, the annual variation of the compass. ANNUL, TO. To nullify a signal.