<?xml version="1.0"?>
<constants>

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

  <constant info="Uranus equatorial radius" name="Ru" units="m" kind="space">25.559e+06</constant>
  <constant info="Neptune equatorial radius" name="Rn" units="m" kind="space">24.764e+06</constant>

  <constant info="Moon equatorial radius" name="Rmo" units="m" kind="space">1.738e+06</constant>
  <constant info="Pluto equatorial radius" name="Rpl" units="m" kind="space">1.195e+06</constant>
  <constant info="Sun equatorial radius" name="Rsun" units="m" kind="space">6.95e+08</constant>

  <constant info="Ganymede (Jupiter moon) mean radius" name="Rga" units="m" kind="space">2.634e+06</constant>
  <constant info="Io (Jupiter moon) mean radius" name="Rio" units="m" kind="space">1.822e+06</constant>
  <constant info="Callisto(Jupiter moon)  mean radius" name="Rca" units="m" kind="space">2.410e+06</constant>
  <constant info="Europa (Jupiter moon) mean radius" name="Reu" units="m" kind="space">1.561e+06</constant>
  <constant info="Titan (Saturn moon) mean radius" name="Rti" units="m" kind="space">2.575e+06</constant>
  <constant info="Enceladus (Saturn moon) mean radius" name="Renc" units="m" kind="space">2.52e+05</constant>

</constants>