Opposition is a term used in positional astronomy and astrology. It means that, as seen from some place (usually the Earth), one celestial body is opposite to another in the sky. Positional astronomy is the study of the positions of celestial objects. ... An astrological chart (or horoscope) - Y2K Chart — This particular chart is calculated for January 1, 2000 at 12:01:00 A.M. Eastern Standard Time in New York City, New York, USA. (Longitude: 074W0023 - Latitude: 40N4251) Astrology (from Greek: αστρολογία = άστρον, astron, star + λόγος, logos, word) is any... Earth, also known as the Earth or Terra, is the third planet outward from the Sun. ...

Specifically, two planets are in opposition to each other when their ecliptic longitudes differ by 180°. A planet (from the Greek πλανήτης, planētēs which means wanderer or more forcefully vagrant, tramp) is an object in orbit around a star that is not a star in its own right. ... Ecliptic longitude is one of the co-ordinates which can be used to define the location of an astronomical object on the celestial sphere in ecliptic coordinates. ...

A planet (or asteroid or comet) is simply said to be in opposition, when it is in opposition to the Sun, as seen from the Earth. This is the best time to observe a planet: An asteroid is a small, solid object in our Solar System, orbiting the Sun. ... Comet Hale-Bopp, showing a white dust tail and blue gas tail (February 1997) A comet is a small astronomical object similar to an asteroid but composed largely of ice. ... A sun is the star at the center of a solar system. ...

• it is visible almost all night (it rises around sunset, culminates around midnight, and sets around sunrise);
• it makes its closest approach to the Earth during its orbit around this time, so it appears biggest and brightest.

The Moon (which orbits the Earth rather than the Sun) is in opposition to the Sun at full moon. In astronomy, the culmination, at a given point, of a planet, star, constellation, etc. ... In physics, an orbit is the path that an object makes, around another object, whilst under the influence of a source of centripetal force, such as gravity. ... Crust composition Oxygen 43% Silicon 21% Aluminium 10% Calcium 9% Iron 9% Magnesium 5% Titanium 2% Nickel 0. ... The Galileo spacecraft took this composite image on December 7, 1992 on its way to explore the Jupiter system in 1995-97. ...

See also: Astronomical conjunction Conjunction is a term used in positional astronomy and astrology. ...