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<u>The original motivation for choosing the degree as a unit of
rotations and angles is unknown. </u>One theory states that it is
related to the fact that 360 is approximately the number of days in
a year.<sup id="cite_ref-2" class="reference"><a
href="https://en.wikipedia.org/wiki/Degree_%28angle%29#cite_note-2"><span>[</span>2<span>]</span></a></sup>
Ancient <a href="https://en.wikipedia.org/wiki/Astronomers"
title="Astronomers" class="mw-redirect">astronomers</a> noticed
that the sun, which follows through the <a
href="https://en.wikipedia.org/wiki/Ecliptic" title="Ecliptic">ecliptic</a>
path over the course of the year, seems to advance in its path by
approximately one degree each day. Some ancient <a
href="https://en.wikipedia.org/wiki/Calendar" title="Calendar">calendars</a>,
such as the <a
href="https://en.wikipedia.org/wiki/Iranian_calendar"
title="Iranian calendar" class="mw-redirect">Persian calendar</a>,
used 360 days for a year. The use of a calendar with 360 days may be
related to the use of <a
href="https://en.wikipedia.org/wiki/Sexagesimal"
title="Sexagesimal">sexagesimal</a> numbers.<br>
<br>
<a class="moz-txt-link-freetext" href="https://en.wikipedia.org/wiki/Degree_%28angle%29">https://en.wikipedia.org/wiki/Degree_%28angle%29</a><br>
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<div class="moz-cite-prefix">On 08/24/2015 11:35 AM, J.N. wrote:<br>
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