<?xml version="1.0"?>
<constants>
  <constant info="astronomical unit" name="AU" units="m">1.49598e+11</constant>
  <constant info="Boltzmann constant" name="k" units="J/K">1.38054e-23</constant>
  <constant info="kelvin to electron-volt" name="K2eV" units="eV/K">8.622e-5</constant>
  <constant info="electron-volt to kelvin" name="eV2K" units="K/eV">1.160e4</constant>
  <constant info="proton mass" name="m_p" units="kg">1.67e-27</constant>
  <constant info="electron mass" name="m_e" units="kg">9.1091e-31</constant>
  <constant info="speed of light in vacuum" name="c" units="m/s">2.99792e+08</constant>
  <constant info="elementary charge" name="q_e" units="C">1.6021e-19</constant>
  <constant info='electric constant' name="epsilon_0" units="F/m">8.85416e-12</constant>
  <constant info='magnetic constant' name="mu_0" units="H/m">1.25664e-06</constant>
  <constant info="pi" name="pi">3.14159</constant>
  <constant info="rad2deg" name="rad2deg" units="deg/rad">57.2958</constant>
  <constant info="deg2rad" name="deg2rad" units="rad/deg">0.0174533</constant>
  <constant info="gravitational constant" name="G" units="m3/kg/s2">6.674e-11</constant>
  <constant info="acceleration of gravity at Earth" name="g" units="m/s2">9.81</constant>
  <constant info="Planck constant" name="h" units="Js">6.626e-34</constant>
  <constant info="Avogadro number" name="NA" units="1/mol">6.0221367e+23</constant>
  <constant info="Mercury equatorial radius" name="Rme" units="m">2.4397e+06</constant>
  <constant info="Venus equatorial radius" name="Rv" units="m">6.0518e+06</constant>
  <constant info="Earth equatorial radius" name="Re" units="m">6.3712e+06</constant>  
  <constant info="Mars equatorial radius" name="Rma" units="m">3.3962e+06</constant>
  <constant info="Jupiter equatorial radius" name="Rj" units="m">71.492e+06</constant>
  <constant info="Saturn equatorial radius" name="Rs" units="m">60.268e+06</constant>
  <constant info="Uranus equatorial radius" name="Ru" units="m">25.559+06</constant>
  <constant info="Neptune equatorial radius" name="Rn" units="m">24.764+06</constant>
  <constant info="Moon equatorial radius" name="Rmo" units="m">1.738e+06</constant>
  <constant info="Pluto equatorial radius" name="Rpl" units="m">1.195e+06</constant>
  <constant info="Sun equatorial radius" name="Rsun" units="m">6.95e+08</constant>
</constants>