FIG.D2, δ, declination, T, hour angle | iOptron 8401 guide

δ, declination

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	Celestial	Zenith
	North Pole	Zenith
	North Pole
		median of
		location

δ, declination

East

North

Celestial Equator

Nadir

t, hour angle

M, midpoint

South

Observer’s horizon

West	star hour circle
axis of rotation

Celestial

South Pole

FIG.D2

29

Image 29

iOptron 8401 manual FIG.D2, δ, declination, t, hour angle

Contents

GoToNovaTM 8401 Hand-Held Controller Manualwww . iOptron . com Page CONTENTS Page Chapter 0 Quick Start Reference The Hubble Site Sky and TelescopeUseful Links http//hubblesite.org 0.2 Getting Started A GPS module makes life a lot easier. It automatically sets the time and location for you Set Local Time 2007-06-18 Daylight Time saving√ What’s Next? 1.0 Basic Symbols Chapter.1 Set Up And Alignment1.1 Set Up Appendix 1.2.2 Two-Star Align NEVER LOOK DIRECTLY AT THE SUN WITH THE NAKED EYES OR WITH Chapter. 2 Select And SlewYou can define and save new celestial objects in the database 2.1 Planets, sun, moon 2.5.4 Variable Stars 2.5 Stars 2.5.1 Named Stars Contains 191 stars 2.5.2 Constellations2.5.5 SAO Bright Stars 2.6 Constellations Contains 88 constellations 2.7 User Objects 3.4 Set up tracking Set up tracking speed 3.5 User objects Chapter. 3 Other FunctionsCheck Appendix A for complete menu structures 3.1 Sync To Target FIG.4 Equatorial Mode Use slower speed for fine tuning Chapter. 4 How to Observe4.2 Observing using arrow keys People usually use alt-zi mode to observe land objects 4.4 Tracking APPENDIX A MENU STRUCTURE o M44 Praesepe, the Beehive Cluster open cluster APPENDIX B Messier Catalogo M51 The Whirlpool Galaxy spiral galaxy o M63 Sunflower galaxy spiral galaxy o M42 The Great Orion Nebula diffuse nebula o M57 The Ring Nebula planetary nebulao M43 part of the Orion Nebula de Mairans Nebula diffuse nebula o M76 The Little Dumbell, Cork, or Butterfly planetary nebula o M7 Ptolemys Cluster open cluster o M6 The Butterfly Cluster open clustero M11 The Wild Duck Cluster open cluster o M1 The Crab Nebula supernova remnant Modern Constellations APPENDIX Cconstellation genitive Canis Minoris 1690, Firmamentum Sobiescianum, Hevelius Microscopium Lynx1624, Bartsch Musca Piscis Austrinus PiscesPuppis Pyxis Volans Australe FIG.D1 APPENDIX D Celestial CoordinatesAltitude Azimuth t, hour angle FIG.D2δ, declination δ, declination α, right ascension FIG. D3 You need two numbers to define a position on the celestial sphere Celestial sphere is an imaginary sphere of infinite radiusPage GoToNovaTM 8401 Specifications Appendix E SPECIFICATIONS Products List Appendix FItem # Product IOPTRON TWO YEAR TELESCOPE, MOUNT, AND CONTROLLER WARRANTY