This solar eclipse will be happening this Tuesday and will be visible in parts of Greenland, Iceland, most of Europe, northeast Africa, and western and central Asia.

It will last for nearly four hours beginning at 5 a.m. ET, or through the early afternoon most of for those in the Eastern hemisphere.

Since the sun, moon and Earth will not be perfectly lined up, it will be a partial eclipse — hence the crescent shape of the sun’s light, which will appear to peek out from underneath the moon.

At the maximum eclipse, where there will be the most coverage of the sun, approximately 86% of the sun will be covered, according to EarthSky.

The moon will be nearly four days from its perigee, its closest point to Earth in its 27-day orbit, during the eclipse, and thus will appear the slightest bit larger than usual.

It is not safe to look at the sun’s rays without protective eyewear, even when the sun is mostly covered by the moon.

It is important to wear eye protection that meets the international standards to be considered proper “eclipse glasses,” according to the American Astronomical Society.

It is also not advisable to look at the sun through an unfiltered camera, telescope, binoculars or other optical device either, even while using proper eyewear.