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