oblateness of the Earth

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• Earth radius — The Earth s shape, like that of all major planets, approximates a sphere. A true sphere has a unique radius, but on Earth the distance from the mean sea level at each point on the surface to the center (the radius of the Earth at a point on the… …   Wikipedia

• Earth Sciences — ▪ 2009 Introduction Geology and Geochemistry       The theme of the 33rd International Geological Congress, which was held in Norway in August 2008, was “Earth System Science: Foundation for Sustainable Development.” It was attended by nearly… …   Universalium

• Transit of Earth from Mars — A transit of Earth across the Sun as seen from Mars takes place when the planet Earth passes directly between the Sun and Mars, obscuring a small part of the Sun s disc for an observer on Mars. During a transit, Earth could be seen from Mars as a …   Wikipedia

• Orbit — This article is about orbits in celestial mechanics, due to gravity. For other uses, see Orbit (disambiguation). A satellite orbiting the Earth has a tangential velocity and an inward acceleration …   Wikipedia

• Orbital station-keeping — In astrodynamics orbital station keeping is a term used to describe the orbital maneuvers made by thruster burns that are needed to keep a spacecraft in a particular assigned orbit. For many Earth satellites the effects of the non Keplerian… …   Wikipedia

• 2004 Indian Ocean earthquake and tsunami — 2004 Indian Ocean earthquake Tsunami strikes Ao Nang, Thailand. Date 00:58:53, December 26 …   Wikipedia

• Edward Sabine — Infobox Scientist name = PAGENAME box width = image size =150px caption = PAGENAME birth date = October 14, 1788 birth place = Dublin death date = May 26, 1883 death place = East Sheen residence = citizenship = nationality = Irish ethnicity =… …   Wikipedia

• Molniya orbit — For other uses, see Molniya (disambiguation). Figure 1: The Molniya orbit. Usually the period from perigee + 2 hours to perigee + 10 hours is used to transmit to the northern hemisphere Molniya orbit is a type of highly elliptical orbit with an… …   Wikipedia

• Orbital perturbation analysis (spacecraft) — Isaac Newton in his Philosophiæ Naturalis Principia Mathematica demonstrated that the gravitational force between two mass points is inversely proportional to the square of the distance between the points and fully solved corresponding two body… …   Wikipedia

• Constellation Observing System for Meteorology, Ionosphere, and Climate — COSMIC Operator COSMIC Major contractors Orbital Sciences Corporation Mission type Meteorology, Ionosphere, Climatology, and …   Wikipedia

• g —    1. see standard gravity    2. see grav    3. see gram    4. see gon    5. g    a symbol for the average acceleration produced by gravity at the Earth s surface (sea level). The actual acceleration of gravity varies from place to place,… …   Dictionary of units of measurement