This week brings the largest supermoon of the year. Supermoons occur because the moon’s orbit is not perfectly circular around the Earth. Instead, it is an ellipse, meaning that sometimes the moon will be closer to the Earth than at other times.
When a full moon coincides with the moon being within 10% of its closest point to Earth, we call it a supermoon. Its proximity makes it appear subtly bigger and brighter than other full moons.
