Mars is already brighter than usual and will shine even more- and appear bigger - as July 31 nears.
The best vantage point to watch the blood moon will be anywhere with an unobstructed view to the west. People in Asia, Middle East and Africa will have the best view of the eclipse and those in Europe, South America and Australia will see partial views.
Friday's eclipse is the first to be visible from Ireland since September 2015 and will be the longest of this century. The partial eclipse of the Moon will begin at 11.54 pm on July 27. In fact, it will be easier to look at than a normal full moon because it will not be as bright.
"So you need to get as clear a view to the south-east as possible, where the Moon will be deepest in eclipse as it rises". Popularly known as the "Blood Moon", the celestial treat would last for one hour and 43 minutes.
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Dr Edward Bloomer, also an astronomer at the Royal Observatory Greenwich, said: "Although Mars being in opposition is a regular event, the elliptical orbits of the planets mean the distance between them can vary quite a bit".
Andrew Fabian is with the University of Cambridge.
The moon is expected to turn reddish as against the familiar whitish appearance in the period of totality.
New Zealand will get a short glimpse at the longest lunar eclipse of the century on Saturday morning.
The moon will start changing shape as it enters the shadow of the earth at 8:24pm.
While other colours in the spectrum are blocked and scattered by the Earth's atmosphere, red light tends to make it through easier.
Some are unimpressed by the biblical moniker for this evening's event.
North America will nearly completely miss out on the blood moon.
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.
How does the Moon turn red?. "It's something that people have heard of before", she said.
So where can you see the total lunar eclipse?
While hoaxers have claimed that Mars will appear as the same size of the moon during the eclipse, the US-based National Aeronautics and Space Administration (NASA) dispelled the rumors. With Mars "in oppostion" the Red Planet and the Sun will be on exact opposite sides of Earth. Some light, though, will still reach it because it is bent by the earth's atmosphere.