**Angular Diameter. **Diameter of an observed object when expressed as the angle it subtends at eye of an observer.
**Angular Distance. **Distance between two observed points when expressed as angle it subtends at eye of observer.
**Angular Momentum. **Product of mass, distances from centre and angular velocities of all particles in a rotating body. Also defined as moment of inertia multiplied by angular velocity. Often called 'Moment of moments'.
**Angular Velocity. **Rate of revolution when expressed as angle passed through in unit time.
**Angulated Sails. **Triangular sails in which upper cloths are parallel to leech, and lower cloths are parallel to foot. Cloths meet at a girth band that is perpendicular to luff.
**Ankaa. **Star α Phoenicis. S.H.A. 354°; Dec. S 43°; Mag. 2-4.
**Annealing. **Process by which metals, and other substances, are heated to an appropriate temperature and then allowed to cool very slowly; so that internal stresses are removed and resiliency and elasticity are restored or induced.
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