Introduction
: The precession, nutation, and orbital ephemerides theories used for high-precision modeling. The Astronomical Almanac
The Explanatory Supplement is divided into several sections, covering various topics related to astronomy and space science. The main sections include:
Astronomical Constants and Reference Systems
Standards: Establishes the internationally accepted models for reference systems, data sets, and time scales. Evolution of Editions
The Explanatory Supplement to the Astronomical Almanac PDF typically includes: