Zenithal-hourly-rate Definition
noun
(astronomy) Number of meteors a single observer would see in one hour under a clear, dark sky (i.e. upto the limiting apparent magnitude of 6.5).
Wiktionary
Other Word Forms of Zenithal-hourly-rate
Noun
Singular:
zenithal-hourly-rate
Plural:
zenithal-hourly-rates
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