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Opposition (astronomy)




A planet (or Asteroid or Comet ) is 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 because:
  • it is visible almost all night, rising around sunset, Culminating around midnight and setting around sunrise;

  • its Orbit brings it closest to the Earth, making it appear bigger and brighter.

  • the Opposition Effect increases the reflected light from bodies with unobscured rough surfaces


Opposition only occurs in Superior Planets .

The Moon , which orbits the Earth rather than the Sun, is in opposition to the Sun at Full Moon . When it is exact in opposition, a Lunar Eclipse occurs.


SUPERIOR AND INFERIOR


As seen from a planet that is Superior , if an Inferior planet is on the opposite side of the Sun, it is in superior conjunction with the Sun. An '''inferior conjunction''' occurs when the two planets lie in a Line on the same side of the Sun . In an inferior conjunction, the superior planet is '''"in opposition"''' to the Sun as seen from the inferior planet.


SEE ALSO