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Gary Wrote

> In fact the key sequence I posted earlier can be improved slightly by
> not saving Hc in register and this preserves A. Lat for additionla
> sight reductions. Make the following tow small changes:...

Interesting.  I too favor the TI-30XA (and wish the current solar version
had the features of the old solar version--a match for the current
battery-operated unit).

NOTE: Mx = Memory register 1, 2, or 3 below.

I store Lat in M1, LHA in M2, and declination in M3.

Once Hc is calculated it is recorded and stored in M2.

Then I use the cosine formula for Z (perhaps much to George's dislike as he
has made a good case for other solutions for Z).  I will have to give your
solution for Z a try.  I use:

cos Z = sin M3 - sin M1 * sin M2 / (cos M1 * cos M2)

Note:  I have to hit "=" before the "cos M1 * cos M2" step and enclose the
"cos M1 * cos M2" in parenthesis as the calculator will not chain that
sequence.  (It has no problems with the sine equation.)

I like my arrangement as when I want to do stupid human tricks (like a time
sight--as the greatest expanse of Lake Michigan is north/south as noted in a
earlier post) I can exchange memory-register 2 (Ho instead of Hc) with
register 3 and proceed with the cosine equation from memory. (I use GHA vs.
LHA instead of EQ time etc. for that exercise.)

I am impressed with your 58-seconds time.  I am below 30 seconds but only
after interpolating GHA, declination and v.  Just a guess, but were you able
to solve the Rubik's Cube in under a minute?  If yes, did you disassemble
it, fine tune and lube it? 

Bill B.


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