EntityQ2051578· pop 5· linked from 7 articlesparallactic angleSign in to savethe angle between the great circle through a celestial object and the zenith, and the hour circle of the objectConnectionsNorth PoleConceptInternational Standard Book NumberEntityequatorEntitytelescopeEntityhorizonEntitycardinal directionEntityastronomical objectEntitydigital object identifierEntityzenithEntityparallaxEntityright ascensionEntitydeclinationEntityLibrary of Congress Control NumberEntityQ180686Entityastronomical coordinate systemEntityoptical dispersionEntitybibcodeEntitygreat circleEntityephemerisEntitysidereal timeEntityCategoriesAngleAstronomical coordinate systemsObservational astronomy