Opposition

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Opposition

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1. The situation of two celestial bodies having either celestial longitudes or sidereal hour angles differing by 180 degrees. The term is usually used only in relation to the position of a planet or the moon from the sun. Compare conjunction. </dd>
2. The situation of two periodic quantities differing by half a cycle. </dd>

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use