text: # -*- coding: utf-8 -*-
  """
  constants.py: Scientific constants in SI units.
  
  Included constants:
  
  * **g0** : standard acceleration of gravity
  * **r_earth** : mean radius of Earth
  * **Omega** : angular velocity of Earth
  * **Rd** : specific gas constant for dry air
  * **Rv** : specific gas constant for water vapor
  * **Cpd** : specific heat capacity of dry air at constant pressure at 300K
  * **Cl** : specific heat capacity of liquid water
  * **Gammad** : dry adiabatic lapse rate
  * **Lv0** : latent heat of vaporization for water at 0C
  """
  from numpy import pi
  
  g0 = 9.80665  # standard gravitational acceleration (m/s)
  stefan = 5.67e-8  # Stefan-boltzmann constant (W/m^2/K^4)
  r_earth = 6370000.  # Radius of Earth (m)
  Omega = 7.2921159e-5  # Angular velocity of Earth (Rad/s)
  Rd = 287.04  # R for dry air (J/kg/K)
  Rv = 461.50  # R for water vapor
  Cpd = 1005.  # Specific heat of dry air at constant pressure (J/kg/K)
  Cl = 4186.  # Specific heat of liquid water (J/kg/K)
  Gammad = g0/Cpd  # Dry adabatic lapse rate (K/m)
  Lv0 = 2.501e6  # Latent heat of vaporization for water at 0 Celsius (J/kg)
  