now I know why the value is spiking like this

https://qph.ec.quoracdn.net/main-qimg-987ff6a28cd9f50e2aee0098cffc8ce7-c

Tonight – December 3, 2017 – the full moon is what we in the Northern Hemisphere call a Cold Moon, Moon Before Yule, or Long Night Moon. It’s also the year’s one and only full supermoon. In other words, it comes close enough to Earth (222,443 miles or 357,987 km) to enjoy supermoon status. The astrologer Richard Nolle, who is credited with coining the term, defines a supermoon as: