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Guy wrote:

> Bill:
> Thank you.
> Your answer is the missing piece to my puzzle
> I now added a test for sine of LHA >0

My pleasure.  I started with a blank slate a couple of years ago, and with
the lists help (and my curiosity) have come a lot farther than I ever
expected.  It is nice to be able to give back.

As to your lines of calculations, that caused me pain.  It seems there is a
strong bias toward the Casio at the $10 US price point by the list gurus.  I
use a TI-30Xa and have tried the Casio.  Except for the initial entry
(display) of the angles, I think the TI wins hands down, especially given
three (3) memory registers.  You can do all the needed calculations through
intercept without ever touching a pencil (until you plot), recording a
result, or reentering a number.  Not only is it quicker, but avoids
potential errors when writing results down and punching keys again.

I somehow liken the Casio to old CAD programs.  Engineers learned to work in
DOS with nothing more than a keyboard and command lines.  They were
resistant to the mouse and GUI interfaces.  It was "unmanly." 

Before dogma takes over, blow $10 on a TI-30Xa and give it a try.  Once you
derive Hc and Z/Zn a dozen times, the sequence of keystrokes is easy to
remember. (1,3  1,2,3 for HC; 3,  1,2,  1,2 for Z.  For increments and
corrections  remember 15 d for the sun, 14d 19' for the moon, and 15d 02.5'
for Aries (15d 27.6' if you want to be exact).  That with the plus/minus
trick for Z to Zn is all you need to remember.

I have attached my TI-30Xa cheat sheet as a PDF for your inspection.  Hope
you give it a try.

Bill

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