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(glossary entry)


Opposition occurs when the Sun and Moon are 180° apart in ecliptic longitude (the rotation angle measured in the plane of the solar system bodies). This means that they are nearly opposite each other in the sky, but not necessarily exactly, since they may differ in latitude (the coordinate perpendicular to the ecliptic longitude).

Additional Information

  • The moment of Full Moon is defined as the moment when the Sun and Moon are in opposition as seen by an imaginary observer at the Earth's center.

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