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  1. In geometry, the nine-point circle is a circle that can be constructed for any given triangle. It is so named because it passes through nine significant concyclic points defined from the triangle. These nine points are: The midpoint of each side of the triangle. The foot of each altitude.

  2. t. e. Orbital mechanics or astrodynamics is the application of ballistics and celestial mechanics to the practical problems concerning the motion of rockets, satellites, and other spacecraft. The motion of these objects is usually calculated from Newton's laws of motion and the law of universal gravitation.

  3. www.encyclopedia.com › astronomy-general › apogeeApogee | Encyclopedia.com

    May 21, 2018 · ap·o·gee / ˈapəjē / • n. Astron. the point in the orbit of the moon or a satellite at which it is furthest from the earth. The opposite of perigee. ∎ fig. the highest point in the development of something; the climax or culmination of something. ORIGIN: late 16th cent.: from French apogée or modern Latin apogaeum, from Greek apogaion ...

  4. 9 Credits. Derivative terms are used to identify the body being orbited. The most common are perigee and apogee, which refer to points on orbits around the Earth, and perihelion and aphelion, which refer to points on orbits around the Sun.

  5. Apogee. The moon's apsides. The point on the moon 's elliptical orbit around the earth at which its distance to the earth is greatest. The nearest point is the perigee . The apogee is also referred to as Lilith . The moon's sizes.

  6. Apogee Definition. The point in an orbit around the planet Earth where the orbiting body is farthest from the planet. The point farthest from the earth in the orbit of the moon or of a man-made satellite. The analogous point in an orbit around a celestial body other than Earth. Not in technical use.

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