Above the moon passes into the Earth's shadow and then back out on the other side.
A total lunar eclipse occurs on Tuesday at 12:46 AM. On this day, the moon crosses the shadow of the Earth and appears dark red during totality. The dark red orangish glow is the sunlight reflected from the Earth off the moon. The color is a result of the sum of all the sunsets across the Earth. The actual color of any one eclipse depends on the weather conditions. A volcano for example can cloud the atmosphere and change the colors we see reflected off the moon.
The event will start about 11 p.m. on Monday night and continue for four and a half hours. The totality will last about an hour from 12:30 a.m. - 1:30 a.m. early Tuesday morning.
Learn more at NASA about the next 3!! American viewable eclipses. Here.