About the Book
Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Pages: 77. Chapters: Celestial coordinate system, Zodiac, Celestial sphere, Geocentric model, Right ascension, Ecliptic, Sidereal year, Declination, Equatorial coordinate system, Zenith, Celestial pole, Horizon, Horizontal coordinate system, Hour angle, Azimuth, Galactic coordinate system, Ecliptic coordinate system, Circumpolar star, Celestial equator, Elongation, Spherical geometry, Celestial X-ray source, Theoretical astronomy, 0, Extrasolar X-ray source astrometry, Astronomical source, Lunar standstill, Galactic quadrant, Poles of astronomical bodies, Equinox, Earth-centered inertial, Vertical direction, Plane of the ecliptic, Culmination, Celestial meridiator, Navigational triangle, Nadir, Barycentric coordinates, Almucantar, Parallactic angle, SOFA, Supergalactic coordinate system, Circumpolar constellation, Position angle, Winter Meridian, International Celestial Reference System, Autumn Meridian, Subsolar point, Summer Meridian, Spring Meridian, International Celestial Reference Frame, Colure, Plane of reference, Ecliptic pole, Geocentric coordinates, Astronomical coordinate systems, Antisolar point, Gaussian year, Polar distance, Space techniques, Vertical circle, Hour circle, Celestial horizon, Prime vertical, Morning width. Excerpt: For differentiating a celestial X-ray source from an astronomical X-ray source, the terms astronomical objects and astronomical bodies differ from "celestial objects" and "celestial bodies" only in that the latter terms do not include the Earth. The celestial sphere is divided by the celestial equator.In astronomy and navigation, the celestial sphere is an imaginary sphere of arbitrarily large radius, concentric with the Earth and rotating upon the same axis. All objects in the sky can be thought of as projected upon the celestial sphere. Projected upward from Earth's equator and geographical pole...
