mural circle

'mural circle' can also refer to...


More Like This

Show all results sharing this subject:

  • Astronomy and Astrophysics


Show Summary Details

Quick Reference

An instrument used before the invention of the telescope to measure the angle above the horizon of astronomical objects as they crossed the meridian. It consisted of a large arc engraved with an angular scale, mounted vertically on a north–south wall. If the arc covered 90 ° (a quarter-circle) it was known as a mural quadrant. A sighting device allowed the altitude above the horizon of a chosen star to be measured.

Subjects: Astronomy and Astrophysics.

Reference entries

Users without a subscription are not able to see the full content. Please, subscribe or login to access all content.