1""" 2""" 3from __future__ import absolute_import 4 5from ..unitquantity import UnitQuantity 6from .length import m, nmi 7from .time import s, h 8 9 10c = speed_of_light = UnitQuantity( 11 'speed_of_light', 12 299792458*m/s, 13 symbol='c', 14 doc='exact' 15) 16kt = knot = knot_international = international_knot = UnitQuantity( 17 'nautical_miles_per_hour', 18 nmi/h, 19 symbol='kt', 20 aliases=['knot', 'knots', 'knot_international', 'international_knot'] 21) 22 23del UnitQuantity, m, nmi, s, h 24