HorizontalCoordinates

class astropy.coordinates.builtin_systems.HorizontalCoordinates(*args, **kwargs)[source] [edit on github]

Bases: astropy.coordinates.coordsystems.SphericalCoordinatesBase

A coordinate in the Horizontal or “az/el” system.

Parameters :

coordstr : str

A single string with the coordinates. Cannot be used with el and az nor x/y/z.

az : Angle, float, int, str

This must be given with el.

el : Angle, float, int, str

This must be given with az.

distance : Distance, optional

This may be given with el and az or coordstr and not x, y, or z. If not given, None (unit sphere) will be assumed.

x : number

The first cartesian coordinate. Must be given with y and z and not with az or el nor coordstr.

y : number

The second cartesian coordinate. Must be given with x and z and not with az or el nor coordstr.

z : number

The third cartesian coordinate. Must be given with x and y and not with az or el nor coordstr.

cartpoint : CartesianPoints

A cartesian point with the coordinates. Cannot be used with any other arguments.

unit :

The unit parameter’s interpretation depends on what other parameters are given:

  • If az and el or coordstr are given:

    unit must be a length-2 sequence specifying the units of az and el, respectively. They can be either UnitBase objects or strings that will be converted using Unit. They can also be None to attempt to automatically interpret the units (see Angle for details.) If unit is just None, this will be interpreted the same as (None, None).

  • If x, y, and z are given:

    unit must be a single unit with dimensions of length

equinox : Time, optional

The equinox for these coordinates. Defaults to J2000.

obstime : Time or None

The time of observation for this coordinate. If None, it will be taken to be the same as the equinox.

Alternatively, a single argument that is any kind of spherical coordinate :

can be provided, and will be converted to `HorizontalCoordinates` and used :

as this coordinate. :

Attributes Summary

equinox
latangle
lonangle
obstime

Attributes Documentation

equinox[source]
latangle[source]
lonangle[source]
obstime[source]

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