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Planets Visible in the Sky.
Make sure you keep your eyes turned to the night sky for the next couple of weeks - you'll be able to see all five planets visible to the unaided eye. Mercury is down near the Western horizon, and sets quickly after sunset. Venus is also the West, and the brightest object in the sky after the Moon. Mars is a small reddish star above Venus. Saturn is nearly directly overhead, and Jupiter is the next brightest object, low in the Eastern horizon after sunset. You won't need a telescope to see them all, but if you can get your hands on one, you're in for an even better view.
For the next couple weeks, all five planets that are ever visible
to the unaided eye shine at once during dusk. Moreover, the Moon and a prominent star cluster join the show as well, forming striking combinations in the early-evening sky.
"This is a special time for anyone who notices the sky," says Alan MacRobert, a senior editor of Sky & telescope magazine. "You don't have to be any kind of great Astronomer to enjoy this."
Sky & telescope offers news media the following guide to the changing celestial scenery. (All descriptions are for midnorthern latitudes, such as those in the United States and southern Canada.)
Every Evening, March 19–31: Spot All Five Planets
Look west as twilight fades on any clear evening, and there's dazzling white Venus. You can't miss it. Venus is the brightest point of light in the early-evening sky.
Look very far below Venus, and perhaps a bit to the right, to catch fainter little Mercury near the horizon. Be sure to look early (about 45 to 60 minutes after sunset) before Mercury gets too low and sets.
To the upper left of Venus, by roughly the width of your fist held at arm's length, you'll find fainter Mars, glimmering pale orange-red.
Three times farther to Mars's upper left is pale yellow Saturn. It's positioned high above the bright constellation Orion.
And Jupiter is the big, bright point of light shining high in the east-southeast. It's second in brightness only to Venus.
March 22: Crescent Moon and Mercury
Look low in the west (far below bright Venus) as twilight fades to pick up the beautifully thin crescent Moon. Look to its lower right - and there's Mercury. Binoculars give a fine view.
March 23: Moon under Venus
The crescent Moon shines below bright Venus in the west this evening, offering a foretaste of their beautiful conjunction (close pairing) tomorrow.
March 24: Crescent Moon and Venus Grab the Eye!
The Moon and Venus are closely paired in the western sky this evening, a strikingly beautiful sight. "This is going to be a real head-turner," says MacRobert. "People will see this through their windshields driving home from work and say, 'What's that?'"
The Moon and Venus are the two brightest objects in the sky after the Sun. Binoculars will give an especially gorgeous view of them paired. This is also a good time to look for "earthshine" making the dark portion of the Moon glow dimly gray. Earthshine is sunlight reflected from the Earth onto the Moon's nighttime landscape - the same way a full moon lights the ground on Earth at night.
As dusk deepens, look for fainter Mars to the upper left of the Moon and Venus, the star Aldebaran to the left or upper left of Mars (looking like its twin), and the Pleiades star cluster nearer to Mars's right. The cluster is about as big as your fingertip held at arm's length.
March 25: Moon with Mars
As a coda to yesterday's Moon-Venus pairing, the Moon now pairs very closely with dimmer orange-red Mars - while Venus blazes brightly to their lower right.
March 27: Saturn Left of the Moon
The Moon now pairs up with Saturn, the next planet east across the sky. Saturn is to the Moon's left. Look below them for the bright constellation Orion.
March 28: Saturn under the Moon
Tonight you'll find the pale yellow point of Saturn shining beneath the Moon, which is now at first-quarter phase (half lit).
April 1–4: Venus Meets the Pleiades
Meanwhile, action has been developing in the west. During and after nightfall in the first few days of April, you'll see the little Pleiades star cluster positioned close to brilliant Venus. Again, binoculars give a wonderful view.
April 2: Moon Shines with Jupiter
Tonight the gibbous Moon shines close to bright Jupiter - the last of the five naked-eye planets that it meets - high in the southeast.
Original Source: S&T News Release
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