What is the Explanatory Supplement to the Astronomical Almanac?
While the annual Astronomical Almanac provides tabulated positional data for the Sun, Moon, planets, and stars, the Supplement answers the "how" and "why": What coordinate system is being used? How is precession calculated? How does relativity affect time scales? It is written at a technical but non-expert level, making it accessible to astronomers, engineers, navigators, surveyors, space scientists, and educators. What is the Explanatory Supplement to the Astronomical
: The math behind the positions of the Sun, Moon, and planets. Time Scales making it accessible to astronomers