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    Re: Which calculator to use for "arctan(tan(269))"?
    From: Tony Oz
    Date: 2017 Jul 14, 09:03 -0700

    Dear Robin,

    Thank you for the comments.

    1) I meant that Lat1 always goes to the A-register. Lon1 always goes to the B-register, Lat2 and Dec - whichever is relevant - go to the C-register, Lon2 and GHABody - whichever is relevant - go to the D-register;

    2) my Casio has the tan button indeed (I'm used to the tg() since my school time);

    3) by giving different names to the Lon-values I meant to stress that location #1 has Lat1, Lon1 and location #2 has Lat2, Lon2 - and should be handled properly. Location #1 is supposed to be observer's or the starting point, location #2 - is the destination;

    4) me too, what is the proper name of the longitudinal difference between the two locations? I think it is not t (the hour angle), which can have either sign. I'd be glad to make the instruction most clear and understandable even for a novice.

    I am limited with only 60mm width of the spot on the cover - hence the brevity of the cheat-sheet.



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