Valerie Illingworth
Abstract
nadir. The point on the *celestial sphere that lies directly beneath an observer and is therefore unobservable. It is diametrically opposite the observer’s *zenith and with the zenith lies on the observer’s * meridian. These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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nadir. The point on the *celestial sphere that lies directly beneath an observer and is therefore unobservable. It is diametrically opposite the observer’s *zenith and with the zenith lies on the observer’s * meridian. These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
Key concepts: Zenith, Observer (physics), Meridian (astronomy), Geodesy, Celestial sphere, Nadir, Unobservable, Mathematics