GeocentricEarthEquatorial

class sunpy.coordinates.frames.GeocentricEarthEquatorial(*args, **kwargs)

Bases: sunpy.coordinates.frames.SunPyBaseCoordinateFrame

A coordinate or frame in the Geocentric Earth Equatorial (GEI) system.

• The origin is the center of the Earth.

• The Z-axis (+90 degrees latitude) is aligned with the Earth’s north pole.

• The X-axis (0 degrees longitude and 0 degrees latitude) is aligned with the mean (not true) vernal equinox.

Parameters

• data (BaseRepresentation or None) – A representation object or None to have no data (or use the coordinate component arguments, see below).

• lon (Angle or Quantity, optional) – The longitude coordinate for this object (lat must also be given and data must be None). Not needed if data is given.

• lat (Angle or Quantity, optional) – The latitude coordinate for this object (lon must also be given and data must be None). Not needed if data is given.

• distance (Quantity, optional) – The distance coordinate from Earth center for this object. Not needed if data is given.

• equinox (tuple, list, str, pandas.Timestamp, pandas.Series, pandas.DatetimeIndex, datetime.datetime, datetime.date, numpy.datetime64, numpy.ndarray, astropy.time.Time) – The date for the mean vernal equinox. Defaults to the J2000.0 equinox.

• obstime (tuple, list, str, pandas.Timestamp, pandas.Series, pandas.DatetimeIndex, datetime.datetime, datetime.date, numpy.datetime64, numpy.ndarray, astropy.time.Time) – The time of the observation. This is used to determine the position of solar-system bodies (e.g., the Sun and the Earth) as needed to define the origin and orientation of the frame.

• representation_type (BaseRepresentation, str, optional) – A representation class or string name of a representation class. This may change the valid coordinate component arguments from the defaults (see above). For example, passing representation_type='cartesian' will make the frame expect Cartesian coordinate component arguments (typically, x, y, and z).

• copy (bool, optional) – If True (default), make copies of the input coordinate arrays.

Notes

Aberration due to Earth motion is not included.

Attributes Summary

default_differential
default_representation
equinox
frame_attributes
frame_specific_representation_info	dict() -> new empty dictionary dict(mapping) -> new dictionary initialized from a mapping object's (key, value) pairs dict(iterable) -> new dictionary initialized as if via: d = {} for k, v in iterable: d[k] = v dict(**kwargs) -> new dictionary initialized with the name=value pairs in the keyword argument list. For example: dict(one=1, two=2).
name

Attributes Documentation

default_differential

default_representation

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

frame_attributes = {'equinox': <sunpy.coordinates.frameattributes.TimeFrameAttributeSunPy object>, 'obstime': <sunpy.coordinates.frameattributes.TimeFrameAttributeSunPy object>}

frame_specific_representation_info

name = 'geocentricearthequatorial'