GeocentricTrueEcliptic¶
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class
astropy.coordinates.
GeocentricTrueEcliptic
(*args, **kwargs)[source] [edit on github]¶ Bases:
astropy.coordinates.BaseEclipticFrame
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.
The frame attributes are listed under Other Parameters.
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 NoneA representation object or None to have no data (or use the other keywords)
lon :
Angle
, optional, must be keywordThe ecliptic longitude for this object (
lat
must also be given andrepresentation
must be None).lat :
Angle
, optional, must be keywordThe ecliptic latitude for this object (
lon
must also be given andrepresentation
must be None).distance :
Quantity
, optional, must be keywordThe distance for this object from the geocenter. (
representation
must be None).pm_lon_coslat :
Angle
, optional, must be keywordThe proper motion in the ecliptic longitude (including the
cos(lat)
factor) for this object (pm_lat
must also be given).pm_lat :
Angle
, optional, must be keywordThe proper motion in the ecliptic latitude for this object (
pm_lon_coslat
must also be given).distance :
Quantity
, optional, must be keywordThe 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.Other Parameters: equinox :
Time
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).
Attributes Summary
default_differential
default_representation
equinox
frame_attributes
frame_specific_representation_info
name
Attributes Documentation
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default_differential
¶
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default_representation
¶
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equinox
= <Time object: scale='utc' format='jyear_str' value=J2000.000>¶
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frame_attributes
= OrderedDict([('equinox', <astropy.coordinates.frame_attributes.TimeFrameAttribute object>)])¶
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frame_specific_representation_info
¶
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name
= 'geocentrictrueecliptic'¶
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