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In 1989 I wrote a definition of ATAN2 in "Mastering Wingz," one of the 31
books I've written about software. The definition:
ATAN2 returns the arctangent of the point defined by xnumber and ynumber.
ATAN2 determines the arctangent of the angle represented by the x-axis
and a line drawn from the point of coordinates xnumber and ynumber to the
zero point on both axes. The result is an angle in radians. A positive
result is a counterclockwise angle from the x-axis; a negative result is
a clockwise angle.
Los Trancos Systems
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