Zenithal hourly rate

Rarity: Uncommon

A topic a little better known than average, read and translated beyond its own country.

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At a glance

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Notion

Domain

Science and technology

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What Wikipedia says

In astronomy, the zenithal hourly rate (ZHR) of a meteor shower is the number of meteors a single observer would see in an hour of peak activity if the radiant was at the zenith, assuming the seeing conditions are perfect (when and where stars with apparent magnitudes up to 6.5 are visible to the naked eye).

Excerpt from the Wikipedia article “Zenithal hourly rate”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Jim Vajda from Oxford, Ohio, USA, CC BY 2.0, via Wikimedia Commons.