Last Updated
：2025/11/27
Zenithal Hourly Rate
（ plural ）
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(astronomy) The number of meteors a single observer would see in one hour under a clear, dark sky (i.e. up to the limiting apparent magnitude of 6.5).
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Zenithal Hourly Rate
Astronomers estimated the Zenithal Hourly Rate of the Perseids to be about 100 meteors under ideal observing conditions.
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Astronomers estimated the Zenithal Hourly Rate of the Perseids to be about 100 meteors under ideal observing conditions.
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