FIG. D3, δ, declination α, right ascension

www.iOptron.com

	Celestial	Zenith
	North Pole	Zenith
	North Pole

median of location

hour circle

East

North

Celestial Equator

δ, declination

α, right ascension

South

West

γ	axis of rotation
gamma point

Observer’s horizon

star hour circle

Nadir	Celestial
	South Pole

FIG. D3

Page 30

Image 30

iOptron 8401 manual FIG. D3, δ, declination α, right ascension

Contents

Manual www . iOptron . comGoToNovaTM 8401 Hand-Held Controller Page CONTENTS Page Chapter 0 Quick Start Reference Useful Links Sky and TelescopeThe Hubble Site http//hubblesite.org A GPS module makes life a lot easier. It automatically sets the time and location for you 0.2 Getting Started Set Local Time 2007-06-18 Daylight Time saving√ What’s Next? 1.1 Set Up Chapter.1 Set Up And Alignment1.0 Basic Symbols Appendix 1.2.2 Two-Star Align You can define and save new celestial objects in the database Chapter. 2 Select And SlewNEVER LOOK DIRECTLY AT THE SUN WITH THE NAKED EYES OR WITH 2.1 Planets, sun, moon 2.5.5 SAO Bright Stars 2.5 Stars 2.5.1 Named Stars Contains 191 stars 2.5.2 Constellations2.5.4 Variable Stars 2.6 Constellations Contains 88 constellations 2.7 User Objects Check Appendix A for complete menu structures Chapter. 3 Other Functions3.4 Set up tracking Set up tracking speed 3.5 User objects 3.1 Sync To Target Equatorial Mode FIG.4 4.2 Observing using arrow keys Chapter. 4 How to ObserveUse slower speed for fine tuning People usually use alt-zi mode to observe land objects 4.4 Tracking APPENDIX A MENU STRUCTURE o M51 The Whirlpool Galaxy spiral galaxy APPENDIX B Messier Catalogo M44 Praesepe, the Beehive Cluster open cluster o M63 Sunflower galaxy spiral galaxy o M43 part of the Orion Nebula de Mairans Nebula diffuse nebula o M57 The Ring Nebula planetary nebulao M42 The Great Orion Nebula diffuse nebula o M76 The Little Dumbell, Cork, or Butterfly planetary nebula o M11 The Wild Duck Cluster open cluster o M6 The Butterfly Cluster open clustero M7 Ptolemys Cluster open cluster o M1 The Crab Nebula supernova remnant constellation APPENDIX CModern Constellations genitive Canis Minoris 1690, Firmamentum Sobiescianum, Hevelius 1624, Bartsch LynxMicroscopium Musca Puppis PiscesPiscis Austrinus Pyxis Australe Volans Altitude APPENDIX D Celestial CoordinatesFIG.D1 Azimuth FIG.D2 δ, declinationt, hour angle FIG. D3 δ, declination α, right ascension Celestial sphere is an imaginary sphere of infinite radius You need two numbers to define a position on the celestial spherePage Appendix E SPECIFICATIONS GoToNovaTM 8401 Specifications Item # Appendix FProducts List Product IOPTRON TWO YEAR TELESCOPE, MOUNT, AND CONTROLLER WARRANTY