g><big> </big></big></big><br>
      <span style="font-family: ms sans serif;">Thermosphere models are
usually employed in space activities such as
mission planning and analysis, orbit determination, attitude control
design, maneuvering planning, fuel estimation and orbit decay studies,
among others.<br>
&nbsp;<br>
The Orbital Dynamics group of INPE coded </span><span style="font-family: ms sans serif;">during the 80&#8217;s several
thermospheric </span><span style="font-family: ms sans serif;">comp