The blue supermoon will 'swallow' Saturn tonight — here's when the rare 'lunar occultation' begins

A close-up of the lower half of the moon, with a time-lapse showing tiny Saturns visible in a line behind the Moon.

Get your stargazing binoculars out! Overnight from Aug. 20 to 21, the blue supermoon will pass in front of — or occult — the ringed planet Saturn. Although Saturn and the moon will be low in the sky when the occultation starts, they will be easily visible when the event ends. After Saturn emerges from behind the moon, the large planet will stay close to the moon all night.

Here's everything you need to know to see this stunning event.