But that's not all.
This time, Mars comes the closest to Earth as compared to any time in the last 15 years.
Unlike solar eclipses, which last a few minutes, lunar eclipses last three hours or longer.
Dr Brown said: 'At this time, the moon passes into the shadow of the Earth, blocking the light from the sun. This lunar eclipse exhibits the longest duration of totality at 103.6 minutes in the 21st century.
Who is going to be able to see it around the world?
The eclipse is visible from Europe, the Middle East, Africa, Australia, most of Asia and South America and in the United Kingdom from around 21:00 to 22:15 BST. It is called a lunar eclipse, according to NASA website.
Mars will more likely appear as a very bright star.
In another rare event, Mars will appear directly below the moon in the skyline tonight at near maximum brightness.
The best vantage point to watch the blood moon will be anywhere with an unobstructed view to the west.
"Hence the appellation of "Blood Moon". Its associations are more superstitious than scientific. But let me explain what happens.
BSS will host a seminar on lunar eclipse addressed by senior scientist Jayant Murthy of the Indian Institute of Astrophysics, to dismiss myths and superstitions.
The next will take place on January 21 2019.
To give the blood moon its technical name, it is a lunar eclipse - caused by the Earth passing between the moon and the sun.
The deepness of the red depends on the particles in the air.
A lunar eclipse is when the sunlight's path to the moon is blocked by the Earth, with the moon falling in the Earth's shadow.
Christie said the combination of all these events was interesting, but nonetheless all predictable under the laws of astronomy. For four hours, it will be partly in the Earth's shadow.
When the moon moves into the conical shaped shadow of the earth, it goes from being illuminated by the sun to being dark. Instead of that sunlight hitting the moon's surface, Earth's shadow falls on it. This is partly because the moon is lower in the sky in the north, and partly because the northern light summer nights mean that the blood colour will not be as clearly visible.