DIAGRAM: How does a lunar eclipse happen?
April 15, 2014 | 6:43 p.m. CDTA lunar eclipse occurs only during a full moon when Earth is directly between the sun and moon. During a total lunar eclipse, the moon often has a vibrant red-orange hue. The light from the sun refracts around Earth's atmosphere into the planet's shadow, casting a reddish hue over the moon. The phenomenon is known as a "blood moon."