Astronomy   View all facts   Glossary   Help
abstraction > mathematical concept > number > quantity > angle > elongation > planetary elongation > planetary elongation event > opposition
Next planetary elongation event: quadrature    Up: planetary elongation event    Previous planetary elongation event: greatest elongation   

opposition
subjectfact 
oppositionhas elongation 180°has source: Hopkins, J. 1976 Glossary of Astronomy and Astrophysics, University of Chicago Press, 2001-09-27 09:30:01.0
has definition Occurs when the Earth comes directly between that planet and the Sun; it can thus only happen in relation to the superior planets and the asteroids.has source: Abbot, D. 1984 Astronomers, Peter Bedrick Books, New York, 2001-09-27 09:30:01.0
has definition A configuration of the Sun, Earth and a planet in which the apparent geocentric longitude of the planet differs by 180 degrees from the apparent geocentric longitude of the Sun.has source: Seidelman, P. 1992 Explanatory Supplement to the Astronomical Almanac, University Science Books, Mill Valley, CA, 2001-09-27 09:30:01.0
is a kind of planetary elongation event2001-09-27 09:30:01.0
eventhas duration2001-09-27 09:29:57.0
has synonym world point2001-09-27 09:29:57.0
has time of occurrence2001-09-27 09:29:57.0
anglehas unit angle unit2001-09-27 09:33:30.0
numberhas value2001-09-27 09:32:57.0