earth-centered orbit

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• 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

• 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

• Apollo 15, Return to Earth — After the Apollo 15 Lunar Module Falcon lifted from the lunar surface it rendezvoused and docked with the Command/Service Module Endeavour . After transferring across the lunar samples and other equipment, Falcon was jettisoned. It would fire its …   Wikipedia

• Geostationary orbit — Geostationary orbit.To an observer on the rotating Earth (fixed point on the Earth), the satellite appears stationary in the sky. A red satellite is also geostationary above its own point on Earth. Top Down View …   Wikipedia

• History of the Earth — For the history of modern humans, see History of the world. Geological time put in a diagram called a geological clock, showing the relative lengths of the eons of the Earth s history The history of the Earth describes the most important events… …   Wikipedia

• Expanding Earth theory — The Expanding Earth theory is an attempt to explain the position and movement of continents (continental drift) on the surface of the Earth. The expanded earth theory (and plate tectonics) incorporates the appearance of new crustal material at… …   Wikipedia

• When We Left Earth: The NASA Missions — DVD/Blu ray case Genre Documentary, science, space exploration, historical Narrated by …   Wikipedia

• Timeline of astronomy — Timeline of astronomy2500 BCMany ancient sites are thought to have astronomical significance, such as the Ancient Egyptian pyramids, Harappan shell instruments, British megaliths, and buildings in China and Latin America.In Lothal, the ancient… …   Wikipedia

• Mars — This article is about the planet. For other uses, see Mars (disambiguation) …   Wikipedia

• Apollo 15, Outward journey — Launching at 9:34:00 am EST on July 26, 1971, Apollo 15 would take four days to reach the Moon. After spending two hours in orbit around the Earth, the S IVB third stage of the Saturn V was reignited to send them to the Moon.During the retrieval… …   Wikipedia

• Deferent and epicycle — Deferent redirects here. For the acknowledgement of the legitimacy of the power of one s superior or superiors, see Deference. The basic elements of Ptolemaic astronomy, showing a planet on an epicycle (smaller dashed circle) , a deferent (larger …   Wikipedia