A full snow moon will be visible in the sky this weekend, but experts disagree about whether or not it's a supermoon. It will be one of the biggest full moons this year, since the Moon is nearing the closest point to Earth in its orbit. But there's no official definition for a supermoon. Astrologer Richard Nolle, who coined the term, and TimeandDate.com say that this is not a supermoon. Astr