A lunar eclipse occurs during rare occasions when the moon passes through the Earth’s shadow, at times when the Sun, the Earth, and the moon form a straight line. The deep red hue of the moon is caused by sunlight refracted by the Earth’s atmosphere where most of the blue light has already been scattered, leaving only the red light to fall on to the moon’s surface. The image shows a fully-eclipsed moon during totality, taken with a 4-inch f/9 refracting telescope and a Canon 450D DSLR at ISO 1600, 2-sec exposure. This photo was featured as December 10, 2012’s Amateur Astronomy Picture of the Day (AAPOD). Photo Credit: Anthony Urbano

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