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The primary purpose of this document is to provide a single source for the
constants and models to be used in the trajectory and navigation design of
missions whose objective is to orbit or land on the Moon.
A secondary objective is to provide the mission analyst with some basic
background information about the Moon, its orbit, and the previous missions
that have explored the Moon.
As a result, this document contains more information than the typical
constants and models document.
Some of the data are required for mission studies while other data are
simply provided for "educational purposes".
This document provides only brief descriptions of the constants and models.
The user should consult the references if more detailed information is desired.
