It is September 28, 2015 as I write this and we just had a rare, dramatic and beautiful lunar eclipse.

It was called both a Blood Moon and a Super Moon. This combination last occurred in 1982 and won’t occur again until 2033.

It was a Blood Moon because it was a total lunar eclipse, when the moon turns red. This is because as the Sun’s light passes through the Earth’s atmosphere, the green to blue to violet light is scattered more than red – so the red color is what reaches the lunar surface. (Remember that a lunar eclipse happens at a full moon, so the earth is between the Sun and Moon.)

It was a Super Moon because the Moon was at its perigee (the closest its elliptical orbit gets to the earth). This makes the moon looks 8-14% larger in the sky as well as brighter.