# PhysicsSphericalDifferential¶

class astropy.coordinates.PhysicsSphericalDifferential(d_phi, d_theta, d_r, copy=True)[source]

Differential(s) of 3D spherical coordinates using physics convention.

Parameters: d_phi, d_theta : Quantity The differential azimuth and inclination. d_r : Quantity The differential radial distance. copy : bool, optional If True (default), arrays will be copied rather than referenced.

Attributes Summary

 attr_classes d_phi Component ‘d_phi’ of the Differential. d_r Component ‘d_r’ of the Differential. d_theta Component ‘d_theta’ of the Differential.

Methods Summary

 from_representation(representation[, base]) Create a new instance of this representation from another one. represent_as(self, other_class[, base]) Convert coordinates to another representation.

Attributes Documentation

attr_classes = {'d_phi': <class 'astropy.units.quantity.Quantity'>, 'd_r': <class 'astropy.units.quantity.Quantity'>, 'd_theta': <class 'astropy.units.quantity.Quantity'>}
d_phi

Component ‘d_phi’ of the Differential.

d_r

Component ‘d_r’ of the Differential.

d_theta

Component ‘d_theta’ of the Differential.

Methods Documentation

classmethod from_representation(representation, base=None)[source]

Create a new instance of this representation from another one.

Parameters: representation : BaseRepresentation instance The presentation that should be converted to this class. base : instance of cls.base_representation The base relative to which the differentials will be defined. If the representation is a differential itself, the base will be converted to its base_representation to help convert it.
represent_as(self, other_class, base=None)[source]

Convert coordinates to another representation.

If the instance is of the requested class, it is returned unmodified. By default, conversion is done via cartesian coordinates.

Parameters: other_class : BaseRepresentation subclass The type of representation to turn the coordinates into. base : instance of self.base_representation, optional Base relative to which the differentials are defined. If the other class is a differential representation, the base will be converted to its base_representation.