The most recent edition (3rd ed., 2013, edited by Sean Urban & P. Kenneth Seidelmann) is . Legitimate PDF access options:
If you are doing modern GPS, satellite tracking, or 21st-century astronomy, the 1992 edition is dangerously obsolete. You need the 2013 3rd edition PDF . the explanatory supplement to the astronomical almanac pdf
(AsA) provides the raw, annual data for celestial positions, the Explanatory Supplement explains the complex theories and algorithms used to calculate those numbers. What is the Explanatory Supplement The most recent edition (3rd ed
The Explanatory Supplement to the Astronomical Almanac is a comprehensive guide that explains the theory, formulas, and data used in the Astronomical Almanac. The Supplement provides an in-depth look at the astronomical data, formulas, and algorithms used to calculate celestial body positions, eclipses, and other astronomical phenomena. It is written for astronomers, scientists, and engineers who need to understand the underlying principles and methods used to generate the data in the Almanac. You need the 2013 3rd edition PDF