A “supermoon” is when a moon is simultaneously full and at its perigee, the point in its orbit when it is closest to Earth. When this happens, the moon appears larger and brighter in the sky. The moon’s orbit is not a perfect circle, due to gravitational forces from both the sun and the Earth, and thus varies in distance from the Earth throughout the year. The point in its orbit when the moon is farthest from Earth is known as the apogee, and appears to be smaller in the sky.
The term “snow moon” is the historic name given to the second full moon of winter by certain Native American tribes in the U.S., according to NASA. It is called the snow moon due to typical snowfall during this time of year. Heavy snowfall is also the reason for its alternative and more grim name, the “hunger moon.” - 60 minutes ago