earth-centered orbit
41Chouseishin Gransazer — Format Sci fi, Fantasy, Action, Adventure Created by Toho and Konami Starring Ryou S …
42Nikolai Kamanin — Nikolai Petrovich Kamanin Born 18 October 1908 Melenki, Vladimir Oblast Died 11 March 1982 …
43Nicolaus Copernicus — Copernicus redirects here. For other uses, see Copernicus (disambiguation). Nicolaus Copernicus …
44Sahara — For other uses, see Sahara (disambiguation). Coordinates: Sahara (الصحراء الكبرى) Desert …
45Argument of periapsis — The argument of periapsis (or argument of perifocus) ( ω ) is the orbital element describing the angle of an orbiting body s periapsis (the point of closest approach to the central body), relative to its ascending node (the point where the body… …
46SGP4 — (Simplified General Perturbations Satellite Orbit Model 4) is a NASA/NORAD algorithm of calculating near earth satellites (i.e. calculating their orbital state vectors relative to the Earth Centered Inertial coordinate system). Any satellite with …
47Stars and planetary systems in fiction — The planetary systems of stars other than the Sun and the Solar System are a staple element in much science fiction. Contents 1 Overview 1.1 The brightest stars …
48Global Positioning System — GPS redirects here. For other uses, see GPS (disambiguation). Geodesy Fundamentals …
49Rings of Saturn — The full set of main rings, imaged as Saturn eclipsed the Sun from the vantage of the Cassini spacecraft on 15 September 2006 (brightness is exaggerated). The pale blue dot at the 10 o clock position, outside the main rings and just inside the G… …
50Io (moon) — ] Unlike most satellites in the outer Solar System (which have a thick coating of ice), Io is primarily composed of silicate rock surrounding a molten iron or iron sulfide core. Most of Io s surface is characterized by extensive plains coated… …
