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Meteors: A Primer
by Paul Deans

Meteor Showers

Four 1998 Leonids
Four brilliant Leonids streaked across Hydra, Canis Minor, and Orion while Lorenzo Lovato in Italy was taking this 9-minute time exposure during the 1998 shower. The radiant point in the Sickle of Leo is at far left. Many visual observers commented on the green-to-red-to-blue color progression of the brightest meteors, recorded here. Lovato used a 16-mm lens to get this wide-angle view.
At certain times of the year we see more meteors than usual. This happens when Earth passes near a comet's orbit and sweeps through debris that the comet has shed. Such events are called meteor showers. For the major annual meteor showers, seeing one meteor every few minutes is typical, though there are often bursts and lulls.

Shower meteors can appear anywhere in the sky, but their direction of motion is away from the constellation whose name the shower bears. This apparent point of origin is known as the radiant. Some observers feel that the best place to watch is between a shower's radiant and the zenith (the point directly overhead). In general, you'll do best by watching the darkest part of your sky, wherever you may be.

Here is a list of the better annual showers, including the Perseids in August and the Geminids in December. All you need to observe these celestial displays are a dark sky, a way to stay comfortable, and a little patience. Light pollution or moonlight will drastically reduce the number of meteors you see, so plan accordingly. Give your eyes at least 15 minutes to adjust to the dark. Make yourself comfortable with a reclining lawn chair, sleeping bag, snacks, music, the company of other stargazers, or whatever will help you remain interested enough to keep your eyes turned toward the sky.



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