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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:

Assumed Lat
2nd DMS-D.D (changes to decimal degree format)
STO 1  (stored A. LAT in 1)
Declination
2nd DMS-D.D
STO 2   (stored DEC in 2)
GHA
2nd DMS-D.D
-
Assumed Longitude
2nd DMS - D.D
= (computed LHA)
STO 3   (LHA stored in 3)
COS
X
RECALL 2  (recalled declination)
COS
X
RECALL 1  (recalled Assumed latitude)
COS
+
RECALL 1 (recalled A. LAT)
SIN
X
RECALL 2  (recalled DEC)
SIN
=
2nd SIN  (ARCSIN, computed Hc)


******************************

REPLACE THE FOLLOWING LINE

STO 1  (stored Hc in 1) (you won't need the  stored A. LAT again)

WITH THESE TWO LINES:

2nd D.D-DMS (changes decimal degree Hc to degree-minute-second so it
can be written down)
2nd DMS - D.D  (changes it back)

CONTINUE
****************************

COS
1/x   (converts COS Hc to SEC Hc)
RECALL 3  (recalled LHA)
SIN
X
RECALL 2  (recalled DEC)
COS
=
2nd SIN  (ARCSIN, computed Z)




*************************

ELIMINATE THE LAST TWO LINES SINCE YOU HAVE ALREADY WRITTEN DOWN Hc


RECALL 1  (recalled Hc)
2nd D.D - DMS (changed Hc in decimal degrees to degrees, minues and
seconds)

************************************************************************

gl

On Jun 19, 4:48 pm, "Gary J. LaPook"  wrote:
> Gary LaPook writes:
>
> I have no idea how it could take ten minues to calculate Hc and  Zn on a
> pocket digital calculator, I just did a sample test and it took me 58
> seconds. I use the standard formula for Hc rearranged to the form:
>
> Hc = arcsin (cos LHA x cos dec x cos lat + sin lat x sin dec)
>
> and  Z = arcsin (sec Hc x sin LHA x cos dec) since implementing it this
> way saves a few keystrokes. Using a TI-30 with only 3 memory locations
> the key strokes are:
>
> (When entering values in the format of degrees.minutes seconds, change
> decimal minutes to seconds, 6 seconds per tenth of a minute, in your
> head  before punching in the assumed latitude, declination  and for the
> GHA and assumed longitude entries.)
>
> Assumed Lat
> 2nd DMS-D.D (changes to decimal degree format)
> STO 1  (stored A. LAT in 1)
> Declination
> 2nd DMS-D.D
> STO 2   (stored DEC in 2)
> GHA
> 2nd DMS-D.D
> -
> Assumed Longitude
> 2nd DMS - D.D
> = (computed LHA)
> STO 3   (LHA stored in 3)
> COS
> X
> RECALL 2  (recalled declination)
> COS
> X
> RECALL 1  (recalled Assumed latitude)
> COS
> +
> RECALL 1 (recalled A. LAT)
> SIN
> X
> RECALL 2  (recalled DEC)
> SIN
> =
> 2nd SIN  (ARCSIN, computed Hc)
> STO 1  (stored Hc in 1) (you won't need the  stored A. LAT again)
> COS
> 1/x   (converts COS Hc to SEC Hc)
> RECALL 3  (recalled LHA)
> SIN
> X
> RECALL 2  (recalled DEC)
> COS
> =
> 2nd SIN  (ARCSIN, computed Z)
> RECALL 1  (recalled Hc)
> 2nd D.D - DMS (changed Hc in decimal degrees to degrees, minues and seconds)
>
> da-da!
>
> done
>
> 58 seconds flat..
>
> gl
>
> Anabasi...@aol.com wrote:
> > gcurte wrote:
>
> > >hello every one,
>
> > >i 'm trying to  get a hendheld calculator to expedite my sight
> > >reduction work.
> > >if i use a regular sciencefic calculator it take me like 10 minutes
> > >per sight. some time i want to trevel light so a calculator will be a
> > >good help.
>
> > Jeremy says:  with practice, this will be down to a minute or two.  I
> > can do a full HO 229 star reduction in under 3 minutes using tables.
> > With a calculator it can be quicker.
>
> > >i can see on internet are a lot of programs ,softwhere   and many
> > >others. the problem with the little palms or pocket pc they depend on
> > >recargebile battery, that mean if you  are somere isoleted you ca not
> > >use it for long time. i see  the starpilot as a good alternative for a
> > >long period of time but reading the instruction on internet
>
> > Jeremy says:  I would suggest one of the navigational calculators over
> > a palm or pocket PC.  I have some self-programmed software on my 15
> > year old TI-85 calculator which uses AAA batteries and lasts for a
> > year or more on a single set of cells.  Also, my 32 year old
> > navigation calculator runs for a year or two on 4 AA batteries, even
> > with fairly regular use.  I believe the Starpilot is software in a
> > TI-83 calculator, so I can't see why that wouldn't last for many
> > months as well, and spare set of AAA cells should be easy to carry.
>
> > ------------------------------------------------------------------------
> > Gas prices getting you down? Search AOL Autos for fuel-efficient used
> > cars .
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