What is a Blue moon?
First of all, for the record, the Moon will definitely not take on a blue hue on Saturday, October 31.
A Blue Moon is instead a fascinating phenomenon that takes place because Full Moons actually occur exactly every 29.53 days.
This means – from an astronomical perspective – a lunar ‘year’ of 12 cycles lasts a little over 354 days.
As a result, this means the lunar year comes almost 11 days shorter than the time it takes the Earth to orbit our Sun, meaning some years occasionally enjoy an extra Full Moon.