in astronomy, an arch of the horizon intercepted between the east or west point, and the centre of the sun, or a planet at its rising and setting, and so is either north and south, or ortive and occulsive. See Astronomy.

Magnetical Amplitude, the different rising or setting of the sun from the east or west points of the compass. It is found by observing the sun, at his rising and setting, by an amplitude-compass.

AMPLITUDE of the range of a projectile, the horizontal line, subtending the path in which the projectile moved.