<h2 id="details">Details<a class="anchor" aria-label="anchor" href="#details"></a></h2>
    <p>The returned value is a copy of <code>object</code> that has been modified in 4 ways.
(1) the horizontal components of velocity are rotated clockwise by
<code>declination</code> degrees.  (2) If the object holds heading values, then
<code>declination</code> is added to them. (3) The <code>north</code> item in the <code>metadata</code> slot
is set to <code>"geographic"</code>, and a warning is issued if this was al