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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