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(positioning of two astronomical objects 180 degrees apart in the sky)

Opposition is the placement of two astronomical objects (e.g., planets) so they are 180 degrees apart on the celestial sphere, e.g., from Earth. This implies the three form a line, such a positioning termed a syzygy. For example, if Jupiter is positioned so it forms a line with Earth and the Sun, then they form a syzygy and Jupiter and the Sun are in opposition.

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celestial event