Update errata.html

errata.html

@@ -95,6 +95,12 @@ <h1>Errata</h1>
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       Page 17: In Listing 2.2, the signs of the X and Y components of vector <em>n</em> in the comment are reversed.  It should be "(-1.0 / Sqrt(2.0), 1.0 / Sqrt(2.0), 0.0)".
   </li>
+  <li>
+      Page 27: In Listing 2.8, the last line of the ScaleToGeocentricSurface function should read "return beta * p;".
+  </li>
+  <li>
+      Page 34: In the last equation on the page, "h = sign(h &#x2022; r - 0)||h||", the "- 0" is extraneous.
+  </li>
   <li>
     Page 62:  In Listing 3.7, the second <em>else</em> condition should be "else (leftEnabled &gt; rightEnabled)" instead of "else (rightEnabled &gt; leftEnabled)".
   </li>