mercury perihelion shift
21Precession — For other uses, see Precession (disambiguation). Precession of a gyroscope Precession is a change in the orientation of the rotation axis of a rotating body. It can be defined as a change in direction of the rotation axis in which the second… …
22Orbit — 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 …
23Einstein , Albert — (1879–1955) German–Swiss–American theoretical physicist Einstein was born at Ulm in Germany where his father was a manufacturer of electrical equipment. Business failure led his father to move the family first to Munich, where Einstein entered… …
24New Horizons — For other uses, see New Horizons (disambiguation). New Horizons Operator NASA Major contractors Applied Physics Laboratory (APL) Southwest Research Institute (SwRI) …
25Johannes Kepler — Infobox Scientist name = Johannes Kepler |175px image width = 175px caption = A 1610 portrait of Johannes Kepler by an unknown artist birth date = Birth date|1571|12|27 birth place = Weil der Stadt near Stuttgart, Germany residence = Baden… …
26Saturn — Infobox Planet bgcolour = #FFCC66 name = Saturn symbol = caption = Saturn, as seen by Cassini orbit ref =cite web last = Yeomans | first = Donald K. | date = 2006 07 13 url = http://ssd.jpl.nasa.gov/?horizons title = HORIZONS System | publisher …
27Uranus — This article is about the planet. For other uses, see Uranus (disambiguation). Uranus   …
28Discovery and exploration of the Solar System — The Sun and planets of the Solar System. (Pluto is now classed as a dwarf planet, and is not shown). The relative sizes of objects are drawn to scale; the distances between them are not. For many thousands of years,[clarification needed] …
29Solar eclipse — A solar eclipse occurs when the Moon passes between the Sun and the Earth so that the Sun is wholly or partially obscured. This can only happen during a new moon, when the Sun and Moon are in conjunction as seen from the Earth. At least two and… …
30atmosphere — atmosphereless, adj. /at meuhs fear /, n., v., atmosphered, atmosphering. n. 1. the gaseous envelope surrounding the earth; the air. 2. this medium at a given place. 3. Astron. the gaseous envelope surrounding a heavenly body. 4. Chem. any… …
