अधोबिंदु

अधोबिंदु (अंग्रेजी: nadir, नादिर) किसी स्थान के ठीक 'नीचे' खगोलीय गोले पर स्थित काल्पनिक बिंदु को कहते हैं। इस परिभाषा में 'नीचे' का मतलब वह दिशा जिसमें गुरुत्वाकर्षण का बल खींच रहा हो। ध्यान दें कि अधोबिंदु से विप्रीय दिशा के बिंदु को शिरोबिंदु (zenith) कहते हैं।^[1]

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सन्दर्भ

↑ The Amateur Astronomer's Introduction to the Celestial Sphere, William Millar, pp. 22, Cambridge University Press, 2006, ISBN 978-0-521-67123-1, ... The sky point straight over your head is called the zenith and its altitude is +90◦. The sky point directly below your feet (on the celestial sphere, on the other side of the Earth) is called the nadir ...

[ref74bijep-1] The Amateur Astronomer's Introduction to the Celestial Sphere, William Millar, pp. 22, Cambridge University Press, 2006, ISBN 978-0-521-67123-1, ... The sky point straight over your head is called the zenith and its altitude is +90◦. The sky point directly below your feet (on the celestial sphere, on the other side of the Earth) is called the nadir ...

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