Computes angular offsets to go from this coordinate to another.

Parameters¶

tocoord~astropy.coordinates.BaseCoordinateFrame

The coordinate to find the offset to.

Returns¶

lon_offset~astropy.coordinates.Angle

The angular offset in the longitude direction. The definition of “longitude” depends on this coordinate’s frame (e.g., RA for equatorial coordinates).

lat_offset~astropy.coordinates.Angle

The angular offset in the latitude direction. The definition of “latitude” depends on this coordinate’s frame (e.g., Dec for equatorial coordinates).

Raises¶

ValueError

If the tocoord is not in the same frame as this one. This is different from the behavior of the separation/separation_3d methods because the offset components depend critically on the specific choice of frame.

Notes¶

This uses the sky offset frame machinery, and hence will produce a new sky offset frame if one does not already exist for this object’s frame class.

See Also¶

separation :

for the total angular offset (not broken out into components).

position_angle :

for the direction of the offset.