Celestron CGEM - 925 Computerized Telescope CGEM Series Manual - Page 3

Home Position ...29 Light Control ...29 Factory Settings...29 Version ...29 Get Axis Position...29 Goto Axis Position ...29 Hibernate ...29 Sun Menu ...29 Scrolling Menu ...30 Set Mount Position ...30 Set Mount Position...30 Turn On/Off GPS ...30 Turn On/Off RTC...30 Periodic Error Correction ...30 TELESCOPE BASICS...32 Image Orientation...32 Focusing ...33 Calculating Magnification ...33 Determining Field of View...33 General Observing Hints ...34 ASTRONOMY BASICS ...35 The Celestial Coordinate System...35 Motion of the Stars ...36 Polar Aligning the Mount ...37 Polar Align ...37 Finding the North Celestial Pole...39 CELESTIAL OBSERVING ...40 Observing the Moon ...40 Lunar Observing Hints ...40 Observing the Planets ...40 Observing the Sun ...40 Solar Observing Hints ...41 Observing Deep Sky Objects...41 Seeing Conditions...41 Transparency ...41 Sky Illumination ...41 Seeing ...41 ASTROPHOTOGRAPHY...43 Short Exposure Prime Focus Photography ...43 Eyepiece Projection ...44 Long Exposure Prime Focus Photography ...46 Periodic Error Correction (PEC) ...47 Using Periodic Error Correction ...47 Terrestrial Photography ...48 Metering ...48 Reducing Vibration ...48 CCD Imaging ...49 Auto Guiding...49 TELESCOPE MAINTENANCE...50 Care and Cleaning of the Optics ...50 Collimation...50 OPTIONAL ACCESSORIES ...53 APPENDIX A - TECHNICAL SPECIFICATIONS...56 APPENDIX B - GLOSSARY OF TERMS ...57 APPENDIX C - RS-232 CONNECTION ...60 APPENDIX D - TIME ZONE MAP...62 SKY MAPS ...64 3