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<p>caused by <a href="page.php?w=precession">precession</a>, nutation and <a href="page.php?w=aberration_of_light">aberration</a>. Supervisory-level subroutines serve as interfaces to the basic and utility subroutines to compute the coordinates of <a href="page.php?w=star">star</a>s or Solar System bodies for specific dates and times.</p>

<p><big> Usage </big></p>
<p>The NOVAS library can be <a href="page.php?w=Linker_%28computing%29">linked</a> by programs that work with positions of <a href="page.php?w=celestial_bodies">celestial bodies</a>. For example,</p><p>
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