Up to a high order of approximation, mutual Taylor expansions of very long time periodic terms.
2.
Even though ELP contains more than 20, 000 periodic terms, but heuristic corrections remained necessary.
3.
This range is smaller than the difference between mean and true conjunction, because during one lunation the periodic terms cannot all change to their maximum opposite value.
4.
In cases where general celestial mechanical analyses of the motion have been carried out ( as they have been for the major planets, the Moon, and other planetary satellites ), the orbit can be described by a set of mean elements with secular and periodic terms.
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