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Data Structures
Here are the data structures with brief descriptions:

cat_entry | Basic astrometric data for any sidereal object located outside the solar system
in_space | Data for an observer's location on Earth orbit
novas_delaunay_args | Fundamental Delaunay arguments of the Sun and Moon, from Simon section 3.4(b.3)
novas_frame | A set of parameters that uniquely define the place and time of observation
novas_matrix | A 3x3 matrix for coordinate transformations
novas_observable | Spherical and spectral coordinate set
novas_orbital | Keplerian orbital elements for NOVAS_ORBITAL_OBJECT type
novas_orbital_system | Specification of an orbital system, in which orbital elements are defined
novas_planet_bundle | Position and velocity data for a set of major planets (which may include the Sun and the Moon also)
novas_timespec | A structure, which defines a precise instant of time that can be extpressed in any of the astronomical timescales
novas_track | The spherical and spectral tracking position of a source, and its first and second time derivatives
novas_transform | A transformation between two astronomical coordinate systems for the same observer location and time
object | Celestial object of interest
observer | Observer location
on_surface | Data for an observer's location on the surface of the Earth, and optional local weather data for refraction calculations only
ra_of_cio | [deprecated]
sky_pos | Celestial object's place on the sky; contains the output from place()