A Blood Moon occurs when all of the Earths sunsets and sunrises are projected onto the face of the Moon at the same time. Also known as a total lunar eclipse.
Earth comes directly between the Moon and the Sun, and looking from the Moon at the Earth, it would appear to be a dark disc with an eerie red glow around it.
That red glow of the sunsets and sunrises reflects off the face of the moon, back to us on Earth – making the Moon appear red, hence the term Blood Moon.
In 2014/2015 we will experience a Lunar Tetrad – a series of 4 total eclipses in a row with 6 lunar months (full moons) between them. You can read more about the lunar tetrad here: What is a Lunar Tetrad?
This short video from Nasa explains in more detail what a Lunar Eclipse and Lunar Tetrad is, beginning with the first total eclipse in April 2014, then October 2014, April 2015 and finally September 2015:
A Lunar Eclipse can be viewed from anywhere on night-time side of the Earth, making it an astronomical spectacle that almost anyone can see with the naked eye. Unlike a Solar Eclipse which is only view-able from a relatively small area of the world. spUnlike a solar eclipse, which can only be viewed from a certain relatively small area of the world, a lunar eclipse may be viewed from anywhere on the night side of the Earth.
Lunar Eclipse’s can span a few hours – as shown in the video above – but as the Moon’s shadow is so small relative in comparison to the Sun’s, a Solar Eclipse where the moon blocks out the sun, lasts only a few minutes.
Unlike Solar Eclipse’s, you can view a Lunar Eclipse with the naked eye, with no need for any special protection or precautions. In fact the reflected red light coming from the Blood Moon, is far less bright than the actual Moon’s itself.
I hope this has helped explain in more detail what a Blood Moon is, and I’d love to read your comments below if you’ve found this interesting.