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    Re: Modifacation to 2102-D
    From: Byron Franklin
    Date: 2009 Aug 12, 17:30 -0700

    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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