Selected algorithms from the book "Astronomical Algorithms" by Jean Meeus, following the second edition, copyright 1998, with corrections as of August 10, 2009.
Package meeus is a documentation-only package. Algorithms are implemented in subdirectories under meeus, one for each chapter of the book. In addition there is a package "base" with additional functions that may not be described in the book but are useful with multiple other packages.
See meeus package documentation for a chapter title cross-reference.