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zenithal hourly rate |
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zenithal hourly rate [′zē·nə·thəl ′au̇r·lē ′rāt] (astronomy) The number of meteors in a meteor shower which would be observed per hour if the radiant of the meteor shower were overhead and there were no moonlight. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| Because different observers see different numbers of meteors depending on local viewing position and sky conditions, astronomers compare counts by using a standard called the zenithal hourly rate (ZHR). |
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