Look Up Tonight: The Tetrad Lunar Eclipse Explained

If you're living in North or South America, look toward the sky tonight for a total lunar eclipse. Beginning around 2 AM Eastern Time tonight (technically April 15th), the moon will pass into the Earth's shadow, and the eclipse will peak between 3 and 4 AM Eastern Time.Lunar eclipses (varying from total eclipses to barely noticeable ones) are fairly common -- typically two to three occur each year. Tonight's eclipse, however, is just the beginning. After tonight, three subsequent lunar eclipses ...