Equinox Systems GEMINI Manuel d'utilisateur télécharger pdf (Page 20)

Gemini Users Manual 15

fair amount of misalignment in a GoTo operation (using the modeling parameters) and

when tracking (using Closed Loop tracking).

There are several methods that you can use to achieve rough polar alignment. The

simplest is to use a compass and place your mount so that the polar axis points north (or

south in the southern hemisphere). Be sure to account for the magnetic variance of your

geographic area. Then, using the latitude scale on your mount (or an inclinometer placed

at an appropriate place on the mount), change the elevation of the polar axis to match

your latitude. In most cases, you should now be well enough polar aligned for visual use.

At night in the northern hemisphere, you can also sight along (or through) the mount’s

polar axis and adjust the elevation and azimuth of the mount until it is pointing at Polaris.

You can also move the telescope to 90° declination (so that it is parallel with the mount’s

polar axis) and again adjust the elevation and azimuth of the mount until Polaris is

centered in the telescope.

In the southern hemisphere or in the north if you cannot sight Polaris because of trees or

buildings, you can use Gemini's Polar Align Assist function for an improved polar

alignment after achieving rough alignment using a compass.

Finally, if your mount has a polar alignment scope, follow the instructions that came with

it for polar aligning. In general, this will be more accurate that either of the above

methods.

After you have completed the remaining steps to get you up and running, you can use

Gemini’s Polar Axis Correction feature to achieve a very accurate alignment.

2.4.1.2 Startup Position

Your next step after positioning the mount is to position

the telescope. When Gemini starts up for the first time or

any time after the mount has been moved, it expects the

telescope to be in a standard Startup position. In this

position the counterweight shaft is pointing down

(CWD), and the Dec. axis is at 90° (OTA pointing at the

celestial pole). Powering on in this position is necessary

so that (1) Gemini will correctly set its movement safety

limits, and (2) so that it can initialize to where it is

pointing. Failure to power up Gemini with the scope in

Startup position will prevent Gemini from being able to

use its GoTo capability to find a first alignment star; it

could also cause the telescope to collide with the tripod

or mount.

2.4.2 Power On and Setup

Now it is finally time to power up the Gemini. After

turning on the power switch, you will see a welcome

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Equinox Systems GEMINI Manuel d'utilisateur Page 20