lass="mf">1.0026454_rk</span>                <span class="p">&amp;</span>
                     <span class="o">-</span><span class="mf">0.0026512_rk</span><span class="o">*</span><span class="nb">cos</span><span class="p">(</span><span class="mi">2</span><span class="o">*</span><span class="n">latitude</span><span class="p">)&amp;</span>
                     <span class="o">+</span><span class="mf">0.0000058_rk</span><span class="o">*</span><span class="nb">cos</span><span class="p">(</span><span class="mi"