GeocentricTrueEcliptic

class astropy.coordinates.GeocentricTrueEcliptic(*args, **kwargs)

Bases: astropy.coordinates.BaseCoordinateFrame

Geocentric ecliptic coordinates. These origin of the coordinates are the geocenter (Earth), with the x axis pointing to the true (not mean) equinox at the time specified by the equinox attribute, and the xy-plane in the plane of the ecliptic for that date.

Be aware that the definition of “geocentric” here means that this frame includes light deflection from the sun, aberration, etc when transforming to/from e.g. ICRS.

This frame has one frame attribute:

• equinox

  The date to assume for this frame. Determines the location of the x-axis and the location of the Earth (necessary for transformation to non-geocentric systems).

Warning

In the current version of astropy, the ecliptic frames do not yet have stringent accuracy tests. We recommend you test to “known-good” cases to ensure this frames are what you are looking for. (and then ideally you would contribute these tests to Astropy!)

Parameters:

representation : BaseRepresentation or None

A representation object or None to have no data (or use the other keywords)

lon : Angle, optional, must be keyword

The ecliptic longitude for this object (lat must also be given and representation must be None).

lat : Angle, optional, must be keyword

The ecliptic latitude for this object (lon must also be given and representation must be None).

distance : Quantity, optional, must be keyword

The Distance for this object from the geocenter. (representation must be None).

copy : bool, optional

If True (default), make copies of the input coordinate arrays. Can only be passed in as a keyword argument.

Attributes Summary

default_representation
equinox
frame_attributes
frame_specific_representation_info
name

Attributes Documentation

default_representation

equinox = <Time object: scale='utc' format='jyear_str' value=J2000.000>

frame_attributes = OrderedDict([('equinox', <astropy.coordinates.baseframe.TimeFrameAttribute object>)])

frame_specific_representation_info

name = 'geocentrictrueecliptic'