Blood Moon: Diagrams explain how eclipses work. Space.com has a big page of more information about blood moons, lunar tetrads (NASA video), a calendar of the four lunar eclipses 2014-15, and a great downloadable infographic called Shadow on the Moon that sums all this up in graphic form! Most of this will be valid for the next three eclipses as well! Going in Astronomy.
Lunar eclipse: When the moon passes through the Earth's shadow, it causes the moon to look very unusual for a short period of time. This event is called a lunar eclipse, and it occurs roughly twice a year.
The phases of the April 14-15 total lunar eclipse are shown with GMT timestamps in this NASA image from a video guide. The total lunar eclipse will affect two NASA spacecraft orbiting the moon since they rely on sunlight for power.
Credit: NASA/JPL-via Kieth BurnsThis montage of images taken by skywatcher Kieth Burns shows the Dec. 20, 2010 total lunar eclipse. The photos won a NASA contest to become an official NASA/JPL wallpaper for the public.
An eclipsed Moon can take on a reddish glow during totality: Veteran eclipse watchers will tell you that if you look really hard right at the beginning and just before the end of totality, you may detect a light blue or turquoise band on the Moon's face. This happens because the Earth's Ozone Layer scatters red light and lets through some of the blue light that gets refracted to the Moon.