class astropy.units.quantity.SpecificTypeQuantity(value: QuantityLike, unit=None, dtype=<class 'numpy.inexact'>, copy=True, order=None, subok=False, ndmin=0)[source]#

Bases: Quantity

Superclass for Quantities of specific physical type.

Subclasses of these work just like Quantity, except that they are for specific physical types (and may have methods that are only appropriate for that type). Astropy examples are Angle and Distance

At a minimum, subclasses should set _equivalent_unit to the unit associated with the physical type.