JRS: In article , dated Fri, 31
Dec 2004 15:29:49, seen in news:uk.sci.astronomy, Fleetie
posted :

On the flipside, Google's "calculator" doesn't know what atan2() is.


If it has Arctan, you can get atan2 by the method of

function AT2(byval Y, X)
if Y0 then
AT2 = 2.0 * Arctan( Y / ( X + Sqr(X*X+Y*Y) ) )
else
if X0 then AT2 = Pi else AT2 = 0.0
end if
end function

See URL:http://www.merlyn.demon.co.uk/vb-maths.htm#AT2 and
URL:http://www.merlyn.demon.co.uk/pas-math.htm#TrigFuncs

Alternatively, take a copy of
URL:http://www.merlyn.demon.co.uk/js-quick.htm
and calculate in javascript.

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