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Byron:John My horizon Disk can be place at the correct Lat & Long.
Not only the over-head but the accuracy near the Horizon is very good. The shape of the Horizon and AZ& HT change very little with a small change
of Lat. Say 45 placed at 41. It's the placement of the 10 degree jump of the 2102-D that hurts.
The change in the stars SHA & Dec for the Star Disk will be good for our life time ++++++.
To find the GMT of any set up, occurrence, you need only - the M&D GMT.
For the time of Sunrise/ Set can be placed on the star disk by NA SR, local newspaper,ect.
from the news I have checked, it, close to the NA, Get the time of Sun rise. Get the GMT for that Month & day add the GMT of paper SR. Next run a line from the Pole to the GMT sum of M&D+SR on the outer base plate. The sun is on the horizon and the line. Marks the sun on the star disk at the horizon with a grease pencil, read the amplitude bearing. You can than track the sun across your sky.
The accuracy: many be + or – a few degrees amplitude and a few minutes for LAN or sun set, or any time between.


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