"During a very dark eclipse the moon may be nearly invisible".
The moon will be totally eclipsed for an estimated 1 hour and 43 minutes in the prime viewing region, according to NASA predictions.
"It starts with a partial eclipse at 7:24 p.m". He will be speaking about the relevance of a lunar eclipse.
The reason we don't get eclipses every month is because the moon orbits Earth on a slightly inclined plane of five degrees. On average, the totality lasts approximately one hour to one hour and 30 minutes during moon eclipse.
The lunar eclipse is seen in the Egyptian capital of Cairo, on July 27, 2018.
"In the middle of a lunar eclipse it can look as if a red planet has taken up residence near the Earth - they are both eerie and attractive", Robert Massey of the RAS said.
He said the moon would begin to enter earth's shadow (known as the penumbra) around 5.15am and would gradually dim until about 6.25am.
While you might imagine that this phenomenon leads to a dark sky, the way the sunlight travels through Earth's atmosphere means that it actually casts the moon in a reddish orange hue-hence the nickname "blood moon".
Australians looking to the sky early this morning have seen the Moon turn red amid this century's longest lunar eclipse.
The professor, however, said that the next total lunar eclipse that would be visible in Nigeria would occur on January 21, 2019. Combined with the red tinge of the Moon, the two will make for an incredibly rare spectacle in the night sky. During the course of the eclipse, Mars will sit at one of its closest points to Earth in its orbit.
People say one should avoid travelling during the eclipse.
And yes, you'll likely hear this eclipse being referred to as the "blood moon". When this happens, the moon appears to glow red and is thus called the blood moon. Unlike solar eclipses, which require protective eyewear, a lunar eclipse can be viewed without specialized eye protection.
As Dr Gregory Brown, an astronomer at the Royal Observatory Greenwich, explains: "At this time, the moon passes into the shadow of the Earth, blocking the light from the sun".
The term "blood moon" may be a rather sinister description for a total eclipse of the moon, but that doesn't take away from the special event which will unfold in the skies on July 27.