Equinox Systems GEMINI Manuel d'utilisateur Page 19

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Gemini Users Manual 14
Centering Speed, after another 2 seconds to ½ Centering Speed, and finally to full
Centering Speed.
Pressing the opposite button twice changes to full Centering Speed immediately.
If you want to guide a photograph manually, you may plug a Standard (not Deluxe) Hand
Controller into Gemini’s autoguider port. This way you are sure that you cannot
accidentally move the scope at centering speed while guiding. The LED on the standard
Hand Controller will not be illuminated when plugged into the autoguider port.
The All Speeds Mode
In this mode, all speeds are available, from Guiding Speed to Slewing Speed, by using
the opposite-button trick. You can use this mode, for example, while drift aligning, when
you need very fine centering of a star at the crosshairs and a fast move from the meridian
to the eastern or western horizon. However, for normal observing, you'll probably select
either the Visual or Photo Mode.
2.4 Basics of Operation
This section will walk you through getting your Gemini system set up and running for the
first time. The steps that we’ll follow are:
Setting up for observing
Rough Polar alignment
Putting the telescope in Startup Position (positioning scope with the
counterweight down and the OTA pointing north if in the northern hemisphere, or
south if in the southern hemisphere).
Powering on
Setting parameters (mount type, time/date/location, etc.)
Aligning mount using alignment stars
Using the mount
2.4.1 Setting Up for Observing
Once you’ve completed the Gemini installation and have connected all the cables, you
are ready to set up for observing. IMPORTANT: As with any telescope mount, make
sure your telescope is properly balanced in both RA and Dec. before continuing. Do this
with all eyepieces and accessories that you intend to use attached. Refer to the
instructions for your mount to help you with this.
2.4.1.1 Rough Polar Alignment
In order to function correctly, your mount must be approximately polar aligned. This
means lining up the mount’s polar axis with the Earth’s rotational axis. You do this by
pointing the mount’s polar axis toward the celestial pole (north celestial pole in the
northern hemisphere, and south celestial pole in the southern hemisphere). For visual
use, this alignment need only be within a few degrees since Gemini can compensate for a
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