Apparent Position of a Star

version (29.9 MB) by David Eagle
PDF document and MATLAB script that computes the geocentric and topocentric apparent position of a star.


Updated Wed, 26 Jan 2022 16:28:32 +0000

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PDF document and MATLAB function named apstar1.m, and a demonstration script, named demo_astar1.m that can be used to determine the apparent geocentric and topocentric coordinates of a star. The source ephemeris for this routine is a JPL binary ephemeris file. These applications use several functions ported to MATLAB from the Fortran version of the NOVAS (Naval Observatory Vector Astrometry Subroutines) source code developed at the United States Naval Observatory (

Cite As

David Eagle (2022). Apparent Position of a Star (, MATLAB Central File Exchange. Retrieved .

MATLAB Release Compatibility
Created with R2019b
Compatible with any release
Platform Compatibility
Windows macOS Linux

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