The nadir (from Arabic ندير nadeer نظير nathir, "opposite") is the astronomical term for the point directly below the observer, or more precisely, the point with an inclination of −90°. Arabic (ar الْعَرَبيّة (informally ar عَرَبيْ) in terms of the number of speakers is the largest living member of the Semitic language Astronomy (from the Greek words astron (ἄστρον "star" and nomos (νόμος "law" is the scientific study In simple terms, if you are standing on the Earth, it is the direction "down" toward your feet. [1]
Geometrically, it is the point on the celestial sphere intersected by a line drawn from the observer's location on the Earth's surface through the center of the Earth. In Astronomy and Navigation, the celestial sphere is an imaginary rotating Sphere of "gigantic Radius " The point opposite the nadir is the zenith. In broad terms the zenith is the direction pointing directly above a particular location ( Perpendicular, Orthogonal) Nadir also refers to a downward-facing viewing angle of an orbiting satellite[2], such as is employed during remote sensing of the atmosphere, as well as when an astronaut faces the Earth while performing an EVA. This article is about artificial satellites For natural satellites also known as moons see Natural satellite. Temperature and layers The temperature of the Earth's atmosphere varies with altitude the mathematical relationship between temperature and altitude varies among five An astronaut or cosmonaut (космона́вт) is a person trained Extra-vehicular activity ( EVA) is work done by an Astronaut away from the Earth and outside of a Spacecraft.
The word is also used figuratively to mean the lowest point of a person's spirits. [3]
References
- ^ Nadir definition. Miriam Webster's Online Dictionary. Miriam Webster is an Australian gospel singer-songwriter Her career began at the age of 15 when she won the interstate music awards Retrieved on 2008-04-23. 2008 ( MMVIII) is the current year in accordance with the Gregorian calendar, a Leap year that started on Tuesday of the Common Events 215 BC - A temple is built on the Capitoline Hill dedicated to Venus Erycina to commemorate the Roman defeat at
- ^ The Common Berthing Mechanism (CBM) for International Space Station. Society of Automotive Engineers, Inc. (2001). Retrieved on 2008-04-23. 2008 ( MMVIII) is the current year in accordance with the Gregorian calendar, a Leap year that started on Tuesday of the Common Events 215 BC - A temple is built on the Capitoline Hill dedicated to Venus Erycina to commemorate the Roman defeat at
- ^ Nadir definition. Encyclopedia Britannica, 11th Edition. The Encyclopædia Britannica is a general English-language encyclopaedia published by Encyclopædia Britannica Inc Retrieved on 2008-04-23. 2008 ( MMVIII) is the current year in accordance with the Gregorian calendar, a Leap year that started on Tuesday of the Common Events 215 BC - A temple is built on the Capitoline Hill dedicated to Venus Erycina to commemorate the Roman defeat at
Dictionary
nadir
-noun
- The point of the celestial sphere, directly opposite the zenith; inferior pole of the horizon; point of the celestial sphere directly under the place where we stand.
- (figuratively) The lowest point; time of greatest depression.
- (astronomy) The axis of a projected conical shadow (e.g. the nadir of the sun is the axis of the conical shadow projected by the Earth)
- (beekeeping, archaic) an empty box added beneath a full one in a beehive to give the colony more room to expand or store honey.
Nadir
-proper noun
- A male given name.
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