<?xml version="1.0"?>

<constants xml:id="constants">

  <constant info="astronomical unit" name="AU" units="km" kind="space">1.49598e+8</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="km" kind="space">2439.7</constant>
  <constant info="Venus equatorial radius" name="Rv" units="km" kind="space">6051.8</constant>
  <constant info="Earth equatorial radius" name="Re" units="km" kind="space" >6371.2</constant>  
  <constant info="Mars equatorial radius" name="Rma" units="km" kind="space">3396.2</constant>
  <constant info="Jupiter equatorial radius" name="Rj" units="km" kind="space">71492.</constant>
  <constant info="Saturn equatorial radius" name="Rs" units="km" kind="space">60268.</constant>
  <constant info="Uranus equatorial radius" name="Ru" units="km" kind="space">25559.</constant>
  <constant info="Neptune equatorial radius" name="Rn" units="km" kind="space">24764.</constant>
  <constant info="Moon equatorial radius" name="Rmo" units="km" kind="space">1738.</constant>
  <constant info="Pluto equatorial radius" name="Rpl" units="km" kind="space">1195.</constant>
  <constant info="Sun equatorial radius" name="Rsun" units="km" kind="space">695000.</constant>
  <constant info="Ganymede (Jupiter moon) mean radius" name="Rga" units="km" kind="space">2634.</constant>
  <constant info="Io (Jupiter moon) mean radius" name="Rio" units="km" kind="space">1822.</constant>
  <constant info="Callisto(Jupiter moon)  mean radius" name="Rca" units="km" kind="space">2410.</constant>
  <constant info="Europa (Jupiter moon) mean radius" name="Reu" units="km" kind="space">1561.</constant>
  <constant info="Titan (Saturn moon) mean radius" name="Rti" units="km" kind="space">2575.</constant>
  <constant info="Enceladus (Saturn moon) mean radius" name="Renc" units="km" kind="space">252.</constant>

</constants>