The moon is at the furthest point from us in its orbit, meaning it'll take longer to pass through the shadow, thus serving up the longest eclipse we've seen in a century.
The spectacle will be visible across Europe, Asia, Australia, Africa, South America and the Middle East, but not North America.
It is set last one hour and 43 minutes, which would make it the longest of the 21st century.
Lunar eclipses also only take place when the moon is full.
Saudi Arabia to witness 21st century's longest total lunar eclipse on Friday
Essentially, the Earth will pass between the Sun and the moon, casting a shadow on the latter and forming a total eclipse.
This is the latest eclipse of the space-housed pair we call our own home (Earth) and our moon.
The eclipse will begin in the early morning of Saturday, 28th July and it will reach a total eclipse by around 5.30am. The sun, Earth and moon will line up and our planet will cast a reddish shadow onto our lunar buddy.
When the full moon moves into Earth's shadow, it will darken, but it won't disappear.
The outcome is generally that a solar eclipse is only seen by a relative few who fall beneath the moon's masking orb. However, it won't be visible from North America.
Unlike a solar eclipse, the lunar event can be viewed without wearing protective eye gear.
The Royal Astronomical Society said that Mars and the moon will appear low in the sky for everyone in the United Kingdom, so a location with an unobstructed southeastern horizon will afford the best view.
Mostly a lunar eclipse occurs twice or thrice a year, but this one will be rare owing to its long duration and visibility from globally.
Mid-eclipse is at 21.21 BST and the "total" phase of the eclipse ends at 22.13.
Also of interest, Mars will be visible very close to the eclipsed moon. However, they shouldn't sweat it because their robotic spacecraft, the Lunar Reconnaissance Orbiter, will experience it first-hand. It was the first time in 152 years, a supermoon, a blue moon and a blood moon coincided.
Stargazers around the world-with the exception of North America-will be able to catch at least a partial glimpse of the July 2018 lunar eclipse during the almost four hours it will be visible in the sky.