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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. (Photo by Alfredo Estrella/AFP Photo)
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