Gemini Users Manual 39
on, and Cold Started again. This does not apply to geographic coordinates or UTC
Date/Time that are changed when prompted during a Cold Start.
3.5.3 Modeling Parameters
Gemini models the following mount and telescope parameters:
• Azimuth misalignment from the pole
• Elevation misalignment from the pole
• Axis non-perpendicularity at the pole
• Axis non-perpendicularity at the equator
• Gear play
• Mirror flop
• Index error in hour angle
• Index error in declination
• Counterweight flexure
You can examine each of these parameters immediately after an additional alignment.
The azimuth and elevation misalignment (A and E) are displayed right after the
“Additional Align” is executed. You can also use the “Show Information” menu item to
display the other parameters: NP = non-perpendicularity at the pole, NE = non-
perpendicularity at the equator, FR = gear play (in RA), FD = mirror flop (in Dec.), IH =
Hour Angle index error, ID = declination index error, and CF = counterweight flexure.
All values are given in minutes of arc. These values give you valuable information about
your alignment, your mount and your telescope.
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