The moon can appear slightly bigger and brighter than normal, weather permitting. On average Supermoon appears about 7% bigger and about 15% brighter than a full moon
The moon's nickname comes from different places. The full moon in July is called as Buck moon because the antlers of male deer (bucks) are in full growth mode at this time the Almanac said
July's full moon is also called the "Thunder Moon" because of early summer's frequent Thunderstorms, NASA's Gordon Johnston said.
According to AccuWeather, other full moon nicknames this month include the berry moon, the halfway summer moon and the salmon moon
A month ago the Supermoon of June 14 was the "Strawberry moon" because it comes at the Strawberry harvest time.
When the moon is highest in the sky, there are no points of comparison, so the illusion disappears, and the moon looks normal again.