GeocentricTrueEcliptic¶
-
class
astropy.coordinates.
GeocentricTrueEcliptic
(*args, copy=True, representation_type=None, differential_type=None, **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.
Parameters: - data :
BaseRepresentation
subclass instance A representation object or
None
to have no data (or use the coordinate component arguments, see below).- lon :
Angle
, optional, must be keyword The ecliptic longitude for this object (
lat
must also be given andrepresentation
must be None).- lat :
Angle
, optional, must be keyword The ecliptic latitude for this object (
lon
must also be given andrepresentation
must be None).- distance :
Quantity
, optional, must be keyword The distance for this object from the geocenter. (
representation
must be None).- pm_lon_coslat :
Angle
, optional, must be keyword The 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 keyword The proper motion in the ecliptic latitude for this object (
pm_lon_coslat
must also be given).- radial_velocity :
Quantity
, optional, must be keyword The radial velocity of this object.
- representation_type :
BaseRepresentation
subclass, str, optional A representation class or string name of a representation class. This sets the expected input representation class, thereby changing the expected keyword arguments for the data passed in. For example, passing
representation_type='cartesian'
will make the classes expect position data with cartesian names, i.e.x, y, z
in most cases.- differential_type :
BaseDifferential
subclass, str, dict, optional A differential class or dictionary of differential classes (currently only a velocity differential with key ‘s’ is supported). This sets the expected input differential class, thereby changing the expected keyword arguments of the data passed in. For example, passing
differential_type='cartesian'
will make the classes expect velocity data with the argument namesv_x, v_y, v_z
.- 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
, optional 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). Defaults to the ‘J2000’ equinox.
Attributes Summary
default_differential
default_representation
equinox
frame_attributes
frame_specific_representation_info
name
Attributes Documentation
-
default_differential
¶
-
default_representation
¶
-
equinox
= <Time object: scale='utc' format='jyear_str' value=J2000.000>¶
-
frame_attributes
= {'equinox': <astropy.coordinates.attributes.TimeAttribute object>}¶
-
frame_specific_representation_info
¶
-
name
= 'geocentrictrueecliptic'¶
- data :