This supermoon is expected to appear about seven per cent larger and 16 per cent brighter than normal, and an optical effect called the moon illusion can make the supermoon appear even bigger just after the sun goes down.
Going to miss Sunday's supermoon?
Unusual astronomical phenomenon called the Supermoon, or perigee moon.The orbit of the moon around the Earth in form is not a flawless circle, and a few stretches.
The moon will appear to be about 14 percent bigger and 30 percent brighter.
The first and last "Supermoon" of 2017 will be visible in the sky this weekend. It is what astronomers call a perigean full moon, or a full moon when it is at its closest point in orbit around Earth, according to NASA. The moon's orbit around our planet is tilted so it usually falls above or below the shadow of the earth.
When's the best time to view the supermoon?
For the Supermoon can be observed on 3 December from 19:00 Kyiv time.
There will be one on New Year's Day followed by another on January 31, which, according to NASA, will be a "super blue blood moon".
You'll be able to watch the supermoon starting on Sunday Dec. 3.
An image of the moon taken by NASA's Lunar Reconnaissance Orbiter is shown in two halves to illustrate the difference between the apparent size of a supermoon (left) and a "micromoon" (right). You also can catch the supermoon online at a free webcast from the Virtual Telescope Project starting at 16:00 UT on December 3.