TOPSHOTS This picture taken on April 14, 2014 shows the moon over the Independence Monument in Mexico city. On April 15, a total lunar eclipse will occur - and seen throughout North and South America -- the first in a series of four eclipses to take place between now and 2015, with an interval of six months between each phenomenon what scientists call "tetrad" - for the first time since December 2011, . The phenomenon will occur again in 2032-2033 and in total will be eight tetrads throughout the XXI century, according to NASA. AFP PHOTO / ALFREDO ESTRELLA