Starting with Level 3 version 1.01, you are able to change the Longitude and Latitude 
immediately after a Cold Start.  Refer to section 2.3.2.1 Cold Start Setup Options for an 
explanation of how this is done. 
The  "Geogr. Location" menu item allows you to input the longitude, latitude and time 
zone of the telescope's geographic location.  Setting the geographic coordinates 
accurately is important because they are used to calculate the initial pointing model 
during a Cold Start, and are also used to calculate the position of the Moon.  The 
longitude is measured from Greenwich, England; eastern longitudes have the designation 
'E', and western longitudes (including the American continent) have the designation 'W.' 
From the sign of the latitude, Gemini knows the hemisphere; northern latitudes are 
"plus," and southern latitudes are "minus.    You should set your longitude and latitude 
first, because the tracking direction in RA depends on the sign of the latitude. 
5.3.10.9.1  Longitude 
The "Longitude" display is as follows: "E/Wddd
mm' " where E/W = either E or W, ddd 
= degrees, and mm = minutes.  Each digit of the "Longitude" is scrolled to the correct 
value using the DEC buttons.  Pressing the RA+ button from the right most digit enters 
the "Longitude." 
5.3.10.9.2  Latitude 
The "Latitude" display is as follows:  "+/ ddd
mm' " where +/  = either plus or minus, 
ddd = degrees, and mm = minutes.  Each digit of the "Latitude" is scrolled to the correct 
value using the DEC buttons.  Pressing the RA+ button from the right most digit enters 
the "Latitude." 
5.3.10.9.3  Timezone 
The "Timezone" display contains a list of time zones that can be scrolled through with 
the DEC buttons and selected with the RA+ button. 
5.3.10.9.4  Query GPS Receiver 
Use this menu to get Longitude, Latitude and UTC Date/Time by querying a GPS 
receiver connected to the serial port.  This is the same function that occurs automatically 
when Gemini is powered on. 
IMPORTANT:
  If you use the   Setup   menu to change Gemini 
s Geographic Location 
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 that are changed 
when prompted during a Cold Start. 
5.3.10.10  Coordinate Epoch  
  
Equinox of Date
  
Epoch J2000.0
Gemini Users Manual 
6  
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