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<font size="+1">Thirty days from date of this message, which has a
full moon, will be a blue moon -- July 31, 2015, will have the
second full moon within the calendar month.<br>
<br>
<a class="moz-txt-link-freetext" href="https://en.wikipedia.org/wiki/Blue_moon">https://en.wikipedia.org/wiki/Blue_moon</a> <br>
</font><br>
A <b>blue moon</b> is an additional full moon that appears in a
subdivision of a year, either the third of four full moons in a
season or, recently, a second full moon in a month of the common
calendar.<br>
<br>
The term has traditionally referred to an 'extra' moon, where a year
which normally has 12 moons has 13 instead. The 'blue moon'
reference is applied to the 3rd moon in a <a
href="https://en.wikipedia.org/wiki/Season#Mid-latitude_astronomical"
title="Season">season</a> with 4 moons,<sup
id="cite_ref-SkyTel2_1-0" class="reference"><a
href="https://en.wikipedia.org/wiki/Blue_moon#cite_note-SkyTel2-1"><span></span><span></span></a></sup>
thus correcting the timing of the last month of a season that would
have otherwise been expected too early. This happens every two to
three years (seven times in the <a
href="https://en.wikipedia.org/wiki/Metonic_cycle" title="Metonic
cycle">Metonic cycle</a> of 19 years).<sup
id="cite_ref-BadAstronomy2_2-0" class="reference"><a
href="https://en.wikipedia.org/wiki/Blue_moon#cite_note-BadAstronomy2-2"><span></span><span></span></a><br>
<br>
<br>
Ken<br>
<br>
</sup>
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