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The Posted picture has the explanation in writting. There are 3 disk.
The bottom is the Base Disk with all the infomation on the outer Rim.
As you can see, This problem is to place 1. Place ,spiderweb,the Lat and Long 
on the base disk and rotate it to DR. long. Lat was already selected as this 
disk just as you do with the 2102-d. You now have your LAT&LONG and horizon. 
You look at your clock and add your zone description for your GMT. you now 
look at the BASE DISK for the month and day desired, at that same place, is 
the GMT equal to that date. That GMT is also equal to 00: on that day. you 
simply add the two GMT's. Last you place the transpart star disk and rotate 
Aries to the the add together GMT's.

If you have an Almanc you can select any month and day off the Base Disk, read 
the degrees for Aries,off the disk and the time if you wish. Look up in the 
Almanac that Month and day, you will find that the GHA of Aries is the same 
as the the disk in degrees. You looked up the month and day on the disk and 
read the time on the disk instead of degrees, you have the advange of 
directly using time for you observation. 2 minute is more that enough time 
for the set up. I have eliminated the Almanac. If you place the sun by Dec 
and GHA on the star disk at the start of the day, or any body you can get the 
time of occurance, rise/set or any place in the sky,you simply read the Aries 
time and substract the GMT of the month and day you started with. I have the 
same horizon disk, (but opague) as the 2102-D.They can be interchangable.
A transparent are the same as 2102-D, but i can work any Celo problem and even 
teach TraingAid this is the reason I made it. That's another sea story.
I have workable models and power poin presetation and a movies on parts and 
how there work together You can see the full base disk and work your 2102-D 
using the information off the picture.


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