Solar System Tour: See 5 Planets in 1 Night

Solar System Tour: See 5 Planets in 1 Night
On Thursday April 15, 2010, the evening starts with a triple conjunction of the moon, Mercury, and Venus, then continues with Mars visiting the Beehive. Full Story. (Image credit: Starry Night® Software.)

On Thursday night, April 15, you will have a wonderfulopportunity to view all the naked eye planets in one night.

Just after sunset, lookfor Venus shining brightly just above the sun. It will be the brightestthing in the sky other than the slender crescent moon, just below and to theright of it. The moon is just a day and a half past new moon. Just below and tothe left of the Moon, look for a tiny speck of light: the planet Mercury.

As the sky grows darker, look overhead for the red planetMars, now fading in brightness. Tonight Marsis visiting the Beehive, the beautiful cluster of stars which is thecenterpiece of the constellation Cancer. In fact, this star cluster outshinesall of the faint stars in this constellation. [Sky Map: See the five planets.]

Notice as the stars begin to come out that the brighteststars are almost all in the western half of the sky. This is because the winterMilky Way is setting in the western sky at this time and, when we lookeastward, we are looking perpendicular to the disk of the Milky Way towardsintergalactic space. There are few bright stars in this direction, the mostobvious being Arcturus, Regulus, and Spica.

Look also for Saturn in this direction, slightly south ofeast, halfway between Regulus and Spica. Saturn?srings are still almost edge on to us, so that the planet is less bright tothe naked eye than usual, and less beautiful in a telescope because its ringsare almost invisible.

About an hour after sunset, we can see four of the fivenaked eye planets plus the moon, arrayed in a giant arc across the sky, theecliptic. Where is the fifth planet? Jupiter is still hiding shyly behind thesun.

Some time this month, if you look carefully just before sunrise,you should be able to spot Jupiter as it emerges from morning twilight andbegins to dominate the early morning sky. It will be low on the horizon, wellto the south of the rising sun.

All of the above is described for observers in the northernhemisphere. If you live south of the equator, you will see a somewhat differentset of events. The triple conjunction of the moon, Mercuryand Venus will be harder to see. On the other hand, Jupiter will be muchmore easily visible in the morning sky. Fortunately, Mars and Saturn areequally visible no matter where on Earth you live.

This article was provided to by Starry Night Education, theleader in space science curriculum solutions.

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Geoff Gaherty
Starry Night Sky Columnist

Geoff Gaherty was's Night Sky columnist and in partnership with Starry Night software and a dedicated amateur astronomer who sought to share the wonders of the night sky with the world. Based in Canada, Geoff studied mathematics and physics at McGill University and earned a Ph.D. in anthropology from the University of Toronto, all while pursuing a passion for the night sky and serving as an astronomy communicator. He credited a partial solar eclipse observed in 1946 (at age 5) and his 1957 sighting of the Comet Arend-Roland as a teenager for sparking his interest in amateur astronomy. In 2008, Geoff won the Chant Medal from the Royal Astronomical Society of Canada, an award given to a Canadian amateur astronomer in recognition of their lifetime achievements. Sadly, Geoff passed away July 7, 2016 due to complications from a kidney transplant, but his legacy continues at Starry Night.