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# Source code for astropy.coordinates.builtin_frames.baseradec

    # Licensed under a 3-clause BSD style license - see LICENSE.rst

    from astropy.coordinates import representation as r
    from astropy.coordinates.baseframe import (
        BaseCoordinateFrame,
        RepresentationMapping,
        base_doc,
    )
    from astropy.utils.decorators import format_doc

    __all__ = ["BaseRADecFrame"]

    doc_components = """
        ra : `~astropy.coordinates.Angle`, optional, keyword-only
            The RA for this object (``dec`` must also be given and ``representation``
            must be None).
        dec : `~astropy.coordinates.Angle`, optional, keyword-only
            The Declination for this object (``ra`` must also be given and
            ``representation`` must be None).
        distance : `~astropy.units.Quantity` ['length'], optional, keyword-only
            The Distance for this object along the line-of-sight.
            (``representation`` must be None).

        pm_ra_cosdec : `~astropy.units.Quantity` ['angular speed'], optional, keyword-only
            The proper motion in Right Ascension (including the ``cos(dec)`` factor)
            for this object (``pm_dec`` must also be given).
        pm_dec : `~astropy.units.Quantity` ['angular speed'], optional, keyword-only
            The proper motion in Declination for this object (``pm_ra_cosdec`` must
            also be given).
        radial_velocity : `~astropy.units.Quantity` ['speed'], optional, keyword-only
            The radial velocity of this object.
    """

    @format_doc(base_doc, components=doc_components, footer="")
    class BaseRADecFrame(BaseCoordinateFrame):
        """
        A base class that defines default representation info for frames that
        represent longitude and latitude as Right Ascension and Declination
        following typical "equatorial" conventions.
        """

        frame_specific_representation_info = {
            r.SphericalRepresentation: [
                RepresentationMapping("lon", "ra"),
                RepresentationMapping("lat", "dec"),
            ]
        }

        default_representation = r.SphericalRepresentation
        default_differential = r.SphericalCosLatDifferential