Science
The blue supermoon will 'swallow' Saturn tonight — here's when the rare 'lunar occultation' begins
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.
How to watch
Viewing Saturn with the naked eye isn't ideal; if you don't use a good backyard telescope or pair of binoculars, Saturn will be indistinguishable from any bright stars in the sky. The best way to view Saturn is to use a pair of high-powered binoculars or a telescope so that you can see its signature rings and moons. If you use a telescope, you can see Saturn in even more detail: in addition to seeing its rings and moons, you will be able to see the bands of clouds at its surface as well.
On Aug. 20, Saturn and the moon will rise in the southeastern part of the sky and set in the southwestern part of the sky. Saturn will lie in the constellation Aquarius, but since Saturn will be so close to the moon, you probably won't need to use Aquarius as a waypoint.
Related: Rare 'moonbows' light up night sky across US as blue supermoon rises — and you could still spot another one
When to watch
Saturn and the moon will rise around 9 p.m. local time on Aug. 20, and will set around 8 a.m. local time on the 21st. Depending on your vantage point, they will reach their highest point in the sky between approximately 2 and 3 a.m., reaching a height of about 42 degrees above the horizon, according to theskylive.com.
The moon will pass in front of Saturn around 8:44 p.m. local time. Depending on your exact location, the occultation will occur immediately before or immediately after the two objects cross the horizon.
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