The moon travels to a similar position every month, but the tilt of its orbit means it normally passes above or below the Earth's shadow - so most months we have a full moon without an eclipse.
The 2018 lunar eclipse will last 20 minutes longer than the last lunar eclipse, which occurred on January 31st and lasted 1 hour and 16 minutes.
The eclipse will last for 1 hour and 43 minutes and will start around 11.54 pm IST on July 27.
When the moon moves into the conical shadow of the earth, it goes from being illuminated by the sun to being dark.
Why does the moon turn red in a Blood Mooneclipse?
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 moon must be full for an eclipse to happen and at the right angle for this to occur.
Pastor Paul Begley - known for frequent YouTube rants where he predicts the end of the world - has claimed that it's a "sign" of the end, and that a "Blood Moon war" might be beginning.
However, forecasters at the Met Office have warned there is a likelihood of "high-level" cloud in the area around the time the moon is set to appear, which could obscure the view of it.
That's because the moon will pass into the shadow of the Earth, blocking the light from the sun and allowing more red wavelengths to reach the moon while the blue and violet wavelengths scatter and become less visible.
She added that the moon will be eclipsed by the Earth before it begins to rise above the horizon - meaning it will turn red before it actually appears.
Apart from it being century's longest lunar eclipse, Mars will be very close to the moon on the same night. Chill out guys, it's just the moon hiding behind the earth for a bit. The Earth orbits, or goes around, the sun.
What makes the celestial event more special is that it will coincide with the fiery planet, Mars, coming closest to the earth in 15 years, causing it to appear the brightest in the evening sky in its reddish-orange hues.
The "blood moon" attracts interest in the sky and lunar eclipses, but rather than awaiting doom and destruction we can better view it along the lines of the Islamic interpretation - as a monumental illustration of the fascinating and real motions of our solar system.
What would the eclipse look like from the moon?
Mars, however, will appear brightest from July 27 to July 30, the space agency says.
You can still catch the eclipse live despite being on the other side of the world, though!
Neil Mahrer, from Jersey Astronomy Club, said: 'What we are doing is taking some telescopes and binoculars to the south-east coast as it will not be that visible from our usual place at Les Creux, ' he said.