src Directory Reference

Files
	calendar.c
	Various functions to convert between calendar dates and Julian days.
	cio.c
	Functions to calculate or access the Celestial Intermediate Origin (CIO) location.
	earth.c
	Various functions relating to Earth position and rotation.
	ephemeris.c
	Functions that allow to define or access Solar-system ephemeris data.
	equator.c
	Various functions for calculating the equator and equinox of date, and related quatities.
	frames.c
	High-level and efficient astrometric calculations using observing frames.
	grav.c
	Various functions to deal with gravitational effects of the major Solar-system bodies on the astrometry.
	itrf.c
	Transformations of station coordinates, velocities, and Earth orinetation parameters (EOP) between various ITRF realizations, and conversion between Cartesian (x, y, z) and geodetic (longitude, latitude, altitude) coordinates w.r.t.
	naif.c
	Solar system ID mappings between NOVAS and NASA's Navigation and Ancillary Information Facility (NAIF), which is used by the JPL ephemeris systems.
	nutation.c
	SuperNOVAS implementations for the IAU2000 nutation series calculations, with varying trade-offs between computational cost and precision.
	observer.c
	This module provides a set of functions that define an astronomical observer location, or ones that relate to observer location.
	orbital.c
	Function relating to the use of Keplerian orbital elements.
	parse.c
	Various functions to parse string specifications of angles, time, dates, and coordinate epochs.
	place.c
	Various convenience variants of the NOVAS C place() function.
	planets.c
	Calculate approximate positions and velocities for the major planets, Sun, Moon, Earth-Moon Barycenter (EMB), and the Solar-system Barycenter (SSB), mainly by using Keplerian orbital elements.
	refract.c
	A collection of refraction models and utilities to use with novas_app_to_hor() or novas_hor_to_app().
	solsys-calceph.c
	Solar-system ephemeris lookup via the CALCEPH C library.
	solsys-cspice.c
	Solar-system ephemeris lookup via the NAIF CSPICE library.
	solsys-ephem.c
	Major planet ephemeris lookup via the function, which was configured by set_ephem_provider().
	solsys3.c
	Planet calculator functions for the Earth and Sun only, with an orbital model fitted to the DE405 ephemerides by JPL.
	spectral.c
	Various spectral / velocity related functions.
	system.c
	Various transformations between different coordinate systems used in astronomy, such as equatorial, ecliptic, Galactic, or local horizontal coordinate systems.
	target.c
	This module contains functions that define an observing target, or which are target related.
	timescale.c
	Functions to define and use different astronomical timescales and to convert among them.
	transform.c
	Various functions to transform rectangular equatorial vectors (positions or velocities) between different equatorial coordinate systems.
	util.c
	Various commonly used routines used throughout the SuperNOVAS library.