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Re: Modification to 2102-D
Date: 2009 Aug 10, 16:05 -0400

```Chief Franklin

I am uncertain how the horizon, star and base disks are adjusted for my latitude.

Your example shows us a 45N, which is one of the disks associated with the 2102-D.
What if my latitude was 40N.  I cannot use the 45N or the 35N or the horizon will be distorted.

Does the base disk have the GMT of Aries for every day of the year?

In other words, I am uncertain how these modifications work together with the 2102D to provide
a new result or method.

Best Regards

-----Original Message-----
From: NavList@fer3.com [mailto:NavList@fer3.com] On Behalf Of QMCM
Sent: Saturday, August 08, 2009 8:05 PM
To: NavList
Subject: [NavList 9421] Modification to 2102-D

I will send picture when I find out how?
The set up as shown on my Astronomer. Hope you can read the Base Disk?
You DR. or yard at home. 45N,71W Feb 4 observer GMT 20:56.
There are 3 disk involved 1 Base disk(carries all needed information,)
2 horizon Disk, 3 star disk.
Place the horizon disk on the base disk and rotate it to 71w.
Your sky and horizon is set up to your closest LAT & LONG.
Find &Read the GMT at Feb 4= 20:56 off the base disk.  You want to
observe at GMT 8:38. The outer rim is GMT only.
Add 20:56 and 8:38 together= 29:34 subtract 24:hours  leaving 5:34.
Place the star disk on the disk and rotate Aries to GMT 5:34. Done!
your sky is set-up.  It that easy and quick. Find the month & day,
read the GMT add the Gmt that you want to observe, set Aries to that
time.
Note the 20:54 is equal to the start (GMT 00 of the day for Feb 4.
Now you can advance time from 5:34 as desired 5:34 is really the
observe time of 8:38. You can advance to any sky occurrence ,(rise set
what ever you desire ) read the time off the base disk at Aries and
subtract the Month and day time to get the GMT. Each degree equals 1
day and 4 minutes of time.
This simple use, was made to educate and attract the young.

The instructor if he looks close will see every item of his course of
instruction

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