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From: Bill (no email)
Date: Thu Jun 01 2006 - 16:38:00 EDT
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." <G>
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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