Celestron CPC 925 GPS XLT Computerized Telescope Instruction Manual - Page 3

TELESCOPE BASICS ...27 Image Orientation ...27 Focusing...27 Calculating Magnification ...28 Determining Field of View ...28 General Observing Hints...28 ASTRONOMY BASICS ...30 The Celestial Coordinate System...30 Motion of the Stars ...31 Polar Alignment (with optional Wedge) ...32 Wedge Align ...32 Finding the North Celestial Pole...32 Declination Drift Method of Polar Alignment...33 CELESTIAL OBSERVING ...35 Observing the Moon ...35 Lunar Observing Hints ...35 Observing the Planets ...35 Planetary Observing Hints...35 Observing the Sun ...36 Solar Observing Hints ...36 Observing Deep Sky Objects ...36 Seeing Conditions...36 Transparency...36 Sky Illumination ...36 Seeing...37 CELESTIAL PHOTOGRAPHY ...38 Short Exposure Prime Focus Photography ...38 Eyepiece Projection...39 Long Exposure Prime Focus Photography...40 Periodic Error Correction (PEC) ...41 Using Periodic Error Correction...41 Terrestrial Photography...42 Metering ...42 Reducing Vibration ...42 F/6.3 with Reducer/Corrector...42 Auto Guiding...43 TELESCOPE MAINTENANCE ...44 Care and Cleaning of the Optics ...44 Collimation...44 OPTIONAL ACCESSORIES...46 APPENDIX A - TECHNICAL SPECIFICATIONS 48 APPENDIX B - GLOSSARY OF TERMS...49 APPENDIX C - LONGITUDES AND LATITUDES 52 APPENDIX D - RS-232 CONNECTION...57 APPENDIX E - TIME ZONE MAP...58 SKY MAPS ...60 OBSERVATIONAL DATA SHEET ...66 3