text: # -*- coding: utf-8 -*-
  # Licensed under a 3-clause BSD style license - see LICENSE.rst
  
  from astropy.utils.decorators import format_doc
  from astropy.coordinates.attributes import TimeAttribute
  from .utils import DEFAULT_OBSTIME
  from astropy.coordinates.baseframe import base_doc
  from .baseradec import BaseRADecFrame, doc_components
  
  __all__ = ['HCRS']
  
  
  doc_footer = """
      Other parameters
      ----------------
      obstime : `~astropy.time.Time`
          The time at which the observation is taken.  Used for determining the
          position of the Sun.
  """
  
  
  @format_doc(base_doc, components=doc_components, footer=doc_footer)
  class HCRS(BaseRADecFrame):
      """
      A coordinate or frame in a Heliocentric system, with axes aligned to ICRS.
  
      The ICRS has an origin at the Barycenter and axes which are fixed with
      respect to space.
  
      This coordinate system is distinct from ICRS mainly in that it is relative
      to the Sun's center-of-mass rather than the solar system Barycenter.
      In principle, therefore, this frame should include the effects of
      aberration (unlike ICRS), but this is not done, since they are very small,
      of the order of 8 milli-arcseconds.
  
      For more background on the ICRS and related coordinate transformations, see
      the references provided in the :ref:`astropy-coordinates-seealso` section of
      the documentation.
  
      The frame attributes are listed under **Other Parameters**.
      """
  
      obstime = TimeAttribute(default=DEFAULT_OBSTIME)
  
  # Transformations are defined in icrs_circ_transforms.py
  