![]() ![]() 2008: David Nelson: The Penguin Dictionary of Mathematics (4th ed.) .NADIR Related Definitions Achromatic Lens Aurora Celss Chromosphere Chromosphere is a reddish and glowing layer of gas above a star’s (or Suns) photosphere. 1998: David Nelson: The Penguin Dictionary of Mathematics (2nd ed.) . The nadir which is directly opposite the zenith, has a zenith distance of 180° and the celestial horizon has a zenith distance of 90°.1998: David Nelson: The Penguin Dictionary of Mathematics (2nd ed.) .Smart: Textbook on Spherical Astronomy (6th ed.) . ![]() ![]() The celestial horizon is also known just as the horizon, and as such is used in common parlance to mean as far as can be seen, figuratively as well as literally. The poles of the celestial horizon are known as the zenith and the nadir. A great circle on the celestial sphere having a plane that passes through the center of the Earth at a right angle to the line formed by an observers zenith. User response to a series of guided-prompts sets up the desired output. h-ri´zon a specific anatomic stage of embryonic development, of which 23 have been defined, beginning with the unicellular zygote (fertilized egg) and ending 7 to 9 weeks later with the beginning of the fetal stage. This is intended for people who want quick access to all program features with an interactive keyboard-type interface. The rest of it is hidden by Earth itself. The Horizons on-line ephemeris and data system is available as a command-line terminal service. Thus the celestial horizon is the edge of the visible part of the celestial sphere. h-rizon a specific anatomic stage of embryonic development, of which 23 have been defined, beginning with the unicellular zygote (fertilized egg) and ending 7 to 9 weeks later with the beginning of the fetal stage. The celestial horizon is the great circle on the celestial sphere whose plane is perpendicular to the line from the zenith to the observer. ![]()
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