hour circle

1. 1.

   a great circle on the celestial sphere that passes through both celestial poles

   Broadergreat circle

Questions about hour circle

What does hour circle mean?

hour circle means "a great circle on the celestial sphere that passes through both celestial poles".

Is hour circle a common word?

hour circle is banded "Rare" — specialist or archaic — most readers will not have met it. The band comes from how often the word appears in a large corpus of everyday English, not from an editor's impression.