Astronomers promise this weekend, from Friday evening to Monday morning, “snow super moon” – the phenomenon of a full snow moon.

The moon will approach the closest point in its orbit to Earth – the perigee, and therefore earthlings can see one of the largest full moons this year. Such proximity to the Earth can cause stronger ocean tides.

Full moons are called super moons as opposed to micromunas, when the moon is at its peak — farthest from Earth. Modern terms refer to how a large and small moon looks at various points in its elliptical orbit. Micromoons seem to be about 14 percent smaller than super moons, and sometimes seem dimmer, as the area illuminated by the Sun becomes 30 percent smaller.

Curiously, Science Alert says that in North America and Europe, people have used full moons to track months and seasons for thousands of years. However, the newspaper writes, the International Astronomical Union (IAU) has not officially defined a super moon or micro moons, and so far astronomers disagree about which full moons get this designation.

The next big full moon, according to astrophysicist Fred Espinak, should be expected on October 1, 2020.