Copyright © 2002-2006 by René Görlich
Gemini Users Manual i
Table of Contents
1 Introduction............................................................................................................... 1
1.1 General Description ........................................................................................ 1
1.2 Features........................................................................................................... 2
1.2.1 Physical Features .................................................................................... 2
1.2.2 Operational Features ............................................................................... 2
1.3 What’s New in Level 4? ................................................................................. 5
1.3.1 Gemini Supports Custom Mounts........................................................... 5
1.3.2 Supporting the Horizontal Coordinate System ....................................... 5
1.3.3 Selectable Serial Port Transmission Rates.............................................. 5
1.3.4 Selectable GPS transmission rate............................................................ 5
1.3.5 Reduced Main Menu selection available ................................................ 5
1.3.6 Redesigned Quick Menu selection.......................................................... 6
1.3.7 Parking the OTA..................................................................................... 6
1.3.8 More Alignment Stars............................................................................. 6
1.3.9 Extended Serial Line Protocol ................................................................ 6
1.3.10 Extended Identify interface..................................................................... 6
1.3.11 Extended Safety Limits Handling........................................................... 6
1.3.12 Selectable PC Synchronization Behavior ............................................... 7
1.3.13 Precision Guiding Commands ................................................................ 7
2 Getting Started .......................................................................................................... 8
2.1 Quick Start Guide ........................................................................................... 8
2.2 Installation....................................................................................................... 9
2.2.1 Motor Installation.................................................................................... 9
2.2.2 Cable Installation .................................................................................... 9
2.2.3 Encoders................................................................................................ 10
2.2.4 Power Requirements ............................................................................. 11
2.3 Hand Controller Overview............................................................................ 11
2.3.1 Controls................................................................................................. 11
2.3.2 Menu Structure/Navigation................................................................... 12
2.3.3 QuickMenu ........................................................................................... 13
2.3.4 Moving the Mount Manually................................................................ 13
2.4 Basics of Operation....................................................................................... 14
2.4.1 Setting Up for Observing...................................................................... 14
2.4.2 Power On and Setup.............................................................................. 15
2.4.3 Refining the Mount's Alignment Model ............................................... 19
2.4.4 Normal Operation ................................................................................. 22
2.5 Next Steps ..................................................................................................... 23
2.5.1 Gemini Users’ Group............................................................................ 23
3 Important Concepts about Your Mount............................................................... 24
3.1 Astronomical Coordinates ............................................................................ 24
3.1.1 Right Ascension and Declination.......................................................... 24
3.1.2 Precession ............................................................................................. 25
3.1.3 Azimuthal Coordinate System .............................................................. 25
3.2 How the Sky Moves...................................................................................... 26
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