On Tuesday, a full lunar eclipse is expected to be visible from North and South America. Four eclipses will occur in 2014, two of them solar and two lunar, in what scientists call a “tetrad,” the first since December 2011.
April 14, 2014 An airliner crosses the moon's path above Whittier, Calif., approximately one hour before a total lunar eclipse. On April 29, the Southern Hemisphere will be treated to a rare type of solar eclipse. In all, four eclipses will occur this year, two lunar and two solar. Nick Ut/AP Buy Photo