Transformation Matrix Between Earth-Fixed and Earth-Centered Inertial Coordinate Systems

A program implementing coordinate transformation matrices between Earth-fixed and Earth-centered inertial frames, incorporating nutation, precession, Earth's rotation, and related astronomical corrections.

Spherical Astronomy (Precession, Nutation) and Celestial Mechanics (Planetary Ephemerides) with MATLAB Algorithms

Original computational formulas, algorithms, and MATLAB-implemented programs for spherical astronomy (precession and nutation calculations) and celestial mechanics (planetary ephemerides). Includes 38 verified MATLAB source codes covering: Gregorian/Julian calendar to Julian Day conversion, Julian Day to Gregorian/Julian calendar conversion, spherical-to-Cartesian coordinate transformations, Cartesian-to-spherical coordinate transformations, and related astronomical computations. The archive contains detailed documentation.