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  In the Army we were provided with a version of the HO 2102-D for use 
with tables for computing the azimuth of visible stars so that we could 
orient our aiming circles which were then used to lay the guns on the 
azimuth of fire. Accurate azimuth is important in field artillery since 
you compute the azimuth on which to fire to hit the coordinates of the 
target which can be 30 miles away.

The army version of the HO 2102-D comes with a table to use in setting 
it up so that you don't need to refer to a separate almanac. I have 
attached a copy of this table which is printed on the back on the 2102-D 
since the army was only interested in possible wars in the northern 
hemisphere.

Another question I have. I have two star finders which are both marked 
HO 2102-D but one of the cases is labeled HO 2101-D, why?

gl
On 10/10/2010 8:00 PM, Greg Rudzinski wrote:
>
> Byron,
>
> It is actually even easier than you have described using your modified 
> 2102-D or a regular 2102-D and a dated/timed radar plotting sheet. The 
> Aries zero is placed on the date 10/11/2010 and the latitude template 
> is set to 0602 UT (sunrise). 98° amplitude, 7° declination, and zero 
> degrees altitude now all intersect. This is then the place on the base 
> disc to pencil in the Sun for the days work to follow.
>
> Greg Rudzinski
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