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.
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© 1979 Laurence Urdang Associates Ltd
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Illingworth, V. (1979). N. In: Macmillan Dictionary of Astronomy. Macmillan Dictionary Series. Palgrave Macmillan, London. https://doi.org/10.1007/978-1-349-17803-2_14
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DOI: https://doi.org/10.1007/978-1-349-17803-2_14
Publisher Name: Palgrave Macmillan, London
Print ISBN: 978-0-333-39243-0
Online ISBN: 978-1-349-17803-2
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