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    Re: Which calculator to use for "arctan(tan(269))"?
    From: David C
    Date: 2017 Feb 1, 17:17 -0800

    The procedure becomes:

    Calculate

    Pol{ [ cos(Lat) · sin(Dec) - sin(Lat) · cos(Dec) · cos(LHA) ] , [-cos(Dec) · sin(LHA) ] }

    and thenHc = cos-1 r and θ = Zn

    I decided to try this method with an example from the Is there a doctor....... thread. I was interested to see if the method worked for dlong = 110°. I am using a Casio fx-82AU calculator and have a problem with editing the Pol() expression. Before someone suggests it I did RTFM (to learn how to enter a , ) but the manual does not help with the editing problem.

    On the fx-82AU an expression can be edited by using the  left/right arrows. Other expressions can be displayed by using the up/down arrows. The problem is that the P() function has two results and the left/right arrows are used to scroll the answer. The up arrow displays the previous  expression. I cannot find a way to escape the Pol() answer and return to editing the Pol() expression. Once I have pressed the = key I cannot edit the expression.

    I cannot believe that an otherwise excellent calculator would have such a design deficiency so what am I doing wrong?

       
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