Encyclopedia > ZHR

  Article Content

Zenithal Hourly Rate

Redirected from ZHR

In astronomy, the Zenithal Hourly Rate (ZHR) of a meteor shower is the number of meteor an observer would see in one hour under a clear, dark sky (limiting apparent magnitude of 6.5) and if the radiant of the shower were in the zenith. The rate which can effectively been seen is always lower and decrease as the radiant is closer to the horizon.

See also List of meteor showers

All Wikipedia text is available under the terms of the GNU Free Documentation License

  Search Encyclopedia

Search over one million articles, find something about almost anything!
  Featured Article
Chancellor of the Exchequer

... London - next door to the Prime Minister, due to his secondary role as Second Lord of the Treasury. However when Tony Blair became Prime Minister in 1997, he swapp ...