The giant planet Jupiter is moving behind the sun, so is dropping rapidly in the western sky. Mercury and Venus, much closer to Earth, are just emerging from behind the sun, moving in the opposite direction from Jupiter. The , weather permitting. Such a tight grouping of planets in the night sky won't come again until 2026.
Find yourself a location with a very low western horizon. Go there just after sunset. A small 7x50 or 10x50will help, but don't point it in the direction of the sun until it is well below the horizon.
Venus is the brightest of the three, and so should be the first that you see, just above and to the left of the point where the sun has just set.
Astronomers use an upside down scale to measure brightness. The brightest stars are magnitude 1; the faintest the human eye can see are magnitude 6. Really bright objects, like these planets, end up with negative brightness. Tonight Venus will be magnitude 4.
Once youve spotted Venus, look for Jupiter nearby. Jupiter will be two magnitudes fainter than Venus, magnitude 2, still extremely bright.
Finally, try to spot the third planet, Mercury, slightly fainter than Jupiter at magnitude 1. Tonight (May 22) and tomorrow night it will be just to the right of Venus, moving upward and to the left more rapidly than Venus.
Try tofor the next week, and youll see them appear to circle around. On Sunday night (May 26) they will form a perfect equilateral triangle, two degrees on a side.
Mercury continues to rise and Jupiter continues to set so that by the middle of next week they will appear in a straight line with Mercury highest and Jupiter lowest, brilliant Venus in the middle.
We don't often get to see three planets in such close proximity and see how rapidly they appear to move.
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.
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