HeliocentricTrueEcliptic

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

Bases: astropy.coordinates.BaseCoordinateFrame

Heliocentric ecliptic coordinates. These origin of the coordinates are the center of the sun, with the x axis pointing in the direction of the true (not mean) equinox as at the time specified by the equinox attribute (as seen from Earth), and the xy-plane in the plane of the ecliptic for that date.

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 and Sun.

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)

l : Angle, optional, must be keyword

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

b : Angle, optional, must be keyword

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

r : Quantity, optional, must be keyword

The Distance for this object from the sun’s center. (representation must be None).

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 at 0x7f523a458550>)])

frame_specific_representation_info

name = 'heliocentrictrueecliptic'