Topics

Here is a list of all topics with brief descriptions:

Astronomical object of interest	Defining the astronomical source of interest, or accessing properties thereof
Observer location	Defining the observer location, or accessing properties thereof
Time of observation and astronomical timescales	Defining the precise time of observation, and support for all relevant astronomical timescales, such as UT1, UTC, TAI, GPS, TT, TDB, TCG, TCB
Observing frame	Observing frames are a combination of an observer place, and a specific time of observation
Apparent positions on sky	Apparent places, defined on the local sky of an observer
Geometric positions and velocities	Geometric locations are 3D positions and velocities relative to an observer location
Equatorial coordinates and systems	Expressing coordinates in the equatorial coordinate systems of choice, such as ICRS/GCRS, J2000, B1950, Mean of Date (MOD), True-of-Date (TOD), or CIRS of date
Other coordinate systems	Expressing coordinates in non-equatorial systems, such as ecliptic, galactic, or local horizontal (for geodetic observer) coordinate systems
Atmospheric refraction	Accounting for atmopheric refraction for observers on or above Earth's surface
Spectroscopic applications	Calculating precise spectroscopic radial velocity measures or redshifts
Solar-system ephemeris providers	Defining how ephemeris positions for Solar-system objects are provided
Earth orientation	Earth Orientation Parameters (EOP), for defining the unmodelled (via the IAU 2000 / 2006 precession-nutation models) polar motion and rotational variations of the physical Earth
Telescope tracking	Tools for supporting telescope tracking, with readily available position, rate of movement, and acceleration of the source's trajectory on sky
Interferometric applications	Various tools supporting interferometric applications, such as u, v, w projections of observing stations and delay calculations along a line of sight
Helpers and utilities	Various helpers tools and utilities of the SuperNOVAS library