Supermoons Explained
Because the moon’s orbit around the earth is not an exact circle, there are key times in the year when the moon is closer to the earth than other times (perigee) or further away (apogee).
At the closest times, supermoons are possible and there are usually four to six supermoons a year.
The moon looks bigger at supermoons and causes bigger tides.
The bigger tides happen even at non-visible new moon supermoons.