EntityQ830118· pop 5· linked from 2 articlesvertical circleSign in to saveoptical instrument used to measure anglesConnectionsastronomyEntitytelescopeEntitymicroscopeEntityreflecting telescopeEntityspherical geometryEntityoptical instrumentEntityaltazimuth mountEntitymeridian circleEntityequatorial mountEntityWilliam ChauvenetEntitygeodetic astronomyEntityVertical circleEntitycomet seekerEntityLinda Hall LibraryEntityCategoriesAstrometry