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    Re: Which calculator to use for "arctan(tan(269))"?
    From: Robin Stuart
    Date: 2016 Nov 4, 08:28 -0700

    Tony,

            I don’t have the Casio fx-85ES Plus but a look in its manual online indicates that it does have the capability to easily convert between rectangular and polar formats. If you use

    Zc = Pol{ [ cos(LatAP) · tan(Dec) - sin(LatAP) · cos(LHA) ] , [-sin(LHA) ] }

    the θ value should be in the correct quadrant. You may still have to add 360 (or use the modulus function if there is one) when the result is negative.

    As far as alternative calculators for celestial navigation go the TI-36X Pro has received some attention on Navlist,

    Regards,

    Robin Stuart

       
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