An annual meteor shower
As an annual meteor shower, the Leonids take place every year, but, in most years, you might see only 10 or 20 meteors per hour at the shower's peak. The Leonids are composed of debris from periodic Comet Tempel-Tuttle. This comet has a period of 33.16 years. When the comet makes a close approach to Earth, as it did in January of 1998, it brings with it a more consolidated trail of debris. When Earth passes through this debris stream, we see a greater display of meteors than usual. We might see a meteor storm.
This year's Leonid meteor shower is predicted to peak on November 17 in late afternoon or early evening, according to U. S. clocks. On the face of it, this prediction is complicated by two facts. First, most meteors showers are best after midnight, when the Earth has turned you directly into the oncoming meteor stream. Second, bright moonlight can drown all but the most spectacular meteors with its glare, and the moon will be large and bright in the sky on the evening of November 17.
Thus, according to the predictions, observers in Europe are favoured for this year's Leonid shower. They're favoured first because the peak is predicted to occur close to or after midnight in Europe, and also because the peak is predicted to take place at a time when the moon has set over the European horizon.
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