Astronomy Answers: From the Astronomical Dictionary

Astronomy Answers
From the Astronomical Dictionary

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The description of the word you requested from the astronomical dictionary is given below.

the mean conjunction

A mean conjunction is a conjunction that has been calculated without taking numerous small perturbations into account, so a mean conjunction usually deviates somewhat from the corresponding true conjunction. On the other hand, the formulas for mean conjunctions are usually reasonably simple. The true conjunction is often calculated by adding correction terms to the mean conjunction.