Photo: SAEED KHAN / AFP / Getty Images
Look up at the night sky tonight, and you'll be treated to a rare sight - a 'blue supermoon'.
What does that mean? A 'supermoon' appears larger and brighter in the night sky, due to the moon's elliptical orbit.
It's also the fourth full moon of the summer, making it a 'seasonal blue moon' - which happen once every 2-3 years on average.
Monday night (August 19th) will be the best night for viewing, with the moon 100% full.