Science@NASA
This NASA graphic shows how close Jupiter, Venus and Mercury will appear on the western horizon in the sunset sky on May 26, 2013.
By Tariq Malik, SPACE.com
Three planets will perform a rare celestial dance in the sunset sky Sunday, a cosmic show that stars Jupiter, Venus and Mercury.
Weather permitting, the?three planets will shine together in a triangle formation low in the western sky in a planetary meet-up known as a conjunction. But there is more to the night sky sight than meets the eye.
"Triple conjunctions of planets are fairly rare," astronomer Tony Phillips explained in a NASA observing guide. "The last time it happened was in May 2011 and it won't happen again until October 2015."
What sets Sunday night's planetary show apart from other conjunctions is that it includes the three brightest planets visible in the May night sky. Venus is the brightest of the trio, with Jupiter a close second and Mercury coming in third.
The three planets will appear within a 3-degree field of the night sky and should fit inside the field of view of a typical set of binoculars. For comparison, your closed fist held out at arm's length covers about 10 degrees of the sky.
The best time to look for Jupiter, Venus and Mercury together is between 30 and 60 minutes after sunset. If you have clear weather, the planets will appear low on the western horizon, so an unobstructed view is vital.
The three planets have been closing in on one another for tonight's sky show over the last week, but if you miss them tonight don't fret. The planet trio will still be visible on Memorial Day Monday as their triangle pattern begins to separate, Phillips wrote.
On Tuesday, Venus and Jupiter will appear extremely close together, separated by just 1 degree, in what could be a "truly spectacular pair," Phillips added.
Editor's note:?If you snap an amazing picture of the three planets or any other night sky view that you'd like to share for a possible story or image gallery, send photos, comments and your name and location to Managing Editor Tariq Malik at?spacephotos@space.com.
Email Tariq Malik at tmalik@space.com or follow him @tariqjmalik?and Google+. Follow us @Spacedotcom, Facebook?and Google+. Original article on SPACE.com.
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