The orientation of the disk of the Moon, as related to the horizon, changes throughout its diurnal motion and the parallactic angle changes equivalently.
2.
James Watt developed an optical meter for the measuring of distance in 1771; it measured the parallactic angle from which the distance to a point could be deduced.
3.
Is the latter one a disused synonym only ? ( I know the meanings of parallax and parallactic angle . )-talk ) 00 : 24, 26 December 2011 ( UTC)
4.
If this angle is measured from the North point on the limb, it can be converted to an angle measured from the zenith point ( the vertex ) as seen by an observer by subtracting the parallactic angle.
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