span></span>  <span class="k">function </span><span class="n">gravityClairaut</span><span class="p">(</span><span class="n">latitude</span><span class="p">)</span> <span class="k">result</span><span class="p">(</span><span class="n">grav</span><span class="p">)</span>
  <span class="c">!! Returns the gravitational acceleration at the Earth&#39;s surface as function</span>
  <span class="c">!! of latitude, based on Clairaut&#39;s formula.</span>
  <span class="c">!!</span>
  <span class="c">!! TODO Reference