Zhr definitions

ZHR

The number of shower meteors per hour one observer would see if his limiting magnitude is 6.5mag and the radiant is in his zenith.
Found on http://www.imo.net/glossary

---

Zhr

ZHR is an abbreviation for Zero hour
Found on http://www.probertencyclopaedia.com/N26.HTM

---

ZHR

Zenith Hourly Rate, the maximum number of meteors per hour that may be observed during a meteor shower
Found on http://www.translationdirectory.com/glossaries/glossary142.htm

---