Warm Start   is used to tell Gemini that the mount itself has not been moved since it was 

powered down, but the clutches were loosened and the telescope was moved by hand.  

Gemini keeps all of the modeling parameters from the previous session, but resets its 

assumed position to the startup position (counterweight down and OTA pointing to the 

pole).  For this reason, you must make sure you have moved the telescope to the Startup 

Position before selecting   Warm Start.   

Finally, if the Gemini is subsequently powered on without the telescope or mount having 

been moved in any way since the last observation, "Warm Restart" is the startup mode of 

choice, and the telescope is immediately ready for use.  All modeling parameters and 

positional information is retained from the previous session.  This startup mode is most 

useful for permanent installations, multi night star parties, and daylight observing. 

IMPORTANT:

  If you use the   Setup   menu to change Gemini 

s Geographic Location, 

UTC Date/Time, or Timezone immediately after a Cold Start, the new values are not used 

to set the initial pointing model or calculate Local Time until Gemini is powered off, 

powered back 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. 

Gemini Users Manual 

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