<p>GREENBELT, Md. (NASA GODDARD) For people in the United States, an extraordinary series of lunar eclipses is about to begin.</p><p>The action starts on April 15th when the full Moon passes through the amber shadow of Earth, producing a midnight eclipse visible across North America. So begins a lunar eclipse tetrada series of 4 consecutive total eclipses occurring at approximately six month intervals. The total eclipse of April 15, 2014, will be followed by another on Oct. 8, 2014, and another on April 4, 2015, and another on Sept. 28 2015.</p><p>"The most unique thing about the 2014-2015 tetrad is that all of them are visible for all or parts of the USA," says longtime NASA eclipse expert Fred Espenak.</p><p>On average, lunar eclipses occur about twice a year, but not all of them are total. There are three types:</p><p><a href="http://wtvr.com/2014/03/28/save-the-date-lunar-eclipse-april-15/">Keep reading...</a></p><p>Read also:</p><p><a href="http://guardianlv.com/2014/03/total-lunar-eclipse-in-april/">Total Lunar Eclipse in April</a> (Guardian Liberty Voice)</p><p><a href="http://www.skyandtelescope.com/observing/highlights/April-2014-Total-Lunar-Eclipse-252931091.html">April&#039;s Total Eclipse of the Moon</a> (Sky &amp; Telescope)</p><p><a href="http://union-bulletin.com/news/2014/mar/28/total-lunar-eclipse-coming-around-tax-day/">Total lunar eclipse coming up around tax day</a> (Walla Walla Union-Bulletin)</p><p>Explore: <a href="http://news.google.com/news/more?ncl=dlmk7P8Z-sOzbRMwnZixELgwWgjuM&authuser=0&ned=us">13 additional articles.</a></p>