import numpy as np

class Conversions:
  # Speed
  MPH_TO_KPH = 1.609344
  KPH_TO_MPH = 1. / MPH_TO_KPH
  MS_TO_KPH = 3.6
  KPH_TO_MS = 1. / MS_TO_KPH
  MS_TO_MPH = MS_TO_KPH * KPH_TO_MPH
  MPH_TO_MS = MPH_TO_KPH * KPH_TO_MS
  METER_TO_FOOT = 3.28084
  FOOT_TO_METER = 1 / METER_TO_FOOT
  CM_TO_INCH = METER_TO_FOOT / 100.0 * 12.0;
  INCH_TO_CM = 1.0 / CM_TO_INCH;
  MS_TO_KNOTS = 1.9438
  KNOTS_TO_MS = 1. / MS_TO_KNOTS

  # Angle
  DEG_TO_RAD = np.pi / 180.
  RAD_TO_DEG = 1. / DEG_TO_RAD

  # Mass
  LB_TO_KG = 0.453592