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I have horizontal coordinates calculated, but they might be wrong (both in how I call NOVAS functions and the JS code itself) because I think I'm mixing up equinox of date coordinates with J2000 coordinates for (RA,DEC). Fixed bug that caused excessive estimate of angular error: right ascension and azimuth are like longitudes -- they matter less as an object approaches the poles. Scale such longitudinal errors by the cosine of the latitudinal counterpart.
Astronomy for JavaScript
This JavaScript module can be used on web pages or in Node.js applications. It is self-contained: no external dependencies!