Constant¶

class astropy.constants.Constant[source] [edit on github]¶

A physical or astronomical constant.

These objects are quantities that are meant to represent physical constants.

Attributes Summary

`abbrev`	A typical ASCII text abbreviation of the constant, also generally the same as the Python variable used for this constant.
`cgs`	If the Constant is defined in the CGS system return that instance of the constant, else convert to a Quantity in the appropriate CGS units.
`name`	The full name of the constant.
`reference`	The source used for the value of this constant.
`si`	If the Constant is defined in the SI system return that instance of the constant, else convert to a Quantity in the appropriate SI units.
`system`	The system of units in which this constant is defined (typically `None` so long as the constant’s units can be directly converted between systems).
`uncertainty`	The known uncertainty in this constant’s value.

Methods Summary

copy() Return a copy of this Constant instance.

Attributes Documentation

abbrev¶: A typical ASCII text abbreviation of the constant, also generally the same as the Python variable used for this constant.

cgs¶: If the Constant is defined in the CGS system return that instance of the constant, else convert to a Quantity in the appropriate CGS units.

si¶: If the Constant is defined in the SI system return that instance of the constant, else convert to a Quantity in the appropriate SI units.

system¶: The system of units in which this constant is defined (typically None so long as the constant’s units can be directly converted between systems).

Methods Documentation

copy()[source] [edit on github]¶: Return a copy of this Constant instance. Since they are by definition immutable, this merely returns another reference to self.