After the welcome message and the GPS status message, you will normally be asked to 

choose a startup mode.  This mode determines whether the Gemini uses the modeling 

data already stored in its SRAM, or resets it and starts with new modeling data.  There 

are 3 options:  

  Cold Start   assumes no modeling data, and is used whenever the mount has been 

moved from its polar alignment after a previous observing session.  The mount 

must be in Startup Position during a Cold Start. 

  Warm Start   preserves the modeling data but not the current telescope position 

data.  It is used if the mount has not been moved since the last observing session, 

but the telescope has been moved on the mount.  The mount must be in the 

Startup Position during a Warm Start. 

  Warm Restart   preserves all modeling and position data.  This is used if no 

movement of the mount or telescope has occurred since the last observing session.  

This is especially useful for permanent installations, multi night star parties, and 

daytime observing if you aligned your mount the night before. 

If the CMOS data has been reset, you will not be given a choice, and the system will 

automatically Cold Start.  For this tutorial, if you do see a choice, select   Cold Start.   

2.4.2.1  Cold Start Setup Options 

Starting with Level 3 version 1.01, you are able to change the UTC Date/Time, Mount 

type, Longitude, and Latitude immediately after a Cold Start.  This is useful if you are 

traveling with your mount, or using your mount for the first time.  After selecting   Cold 

Start   (or automatically being Cold started after a CMOS reset), the display sequences 

through the following settings that can be changed one at a time:  

UTC Date/Time 

Mount Type 

Longit. 

Latitude 

Each item will be displayed for a few seconds before going to the next one.  If you want 

to change the currently displayed item, press one of the four direction buttons on the 

Hand Controller.   To skip to the next item without waiting, press the MENU button.  If 

you miss setting an item at this time, you can always use the   Setup   menu to make the 

change after startup is complete (see chapter 5 for details on using the   Setup   menu). 

2.4.2.1.1  Setting the UTC Date and Time  

The current UTC date and time must be entered into Gemini so that it can make correct 

calculations for pointing the telescope.  If you choose to set the UTC date and time 

during startup, first note the display, which will show the current value.  The format for 

the date and time is   yymm.dd  hh:mm:ss   and must be in Coordinated Universal Time 

(UTC)   not your local time.  Enter each digit of the date and time using the direction 

buttons on the Hand Controller as described in section 2.2.2 above.  The currently 

selected digit will blink.  After selecting the seconds digit, press RA+.  Gemini will then 

return to the startup process and allow you to change the next item. 

Gemini Users Manual 

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