EntityQ7598374· pop 7· linked from 11 articlesstandard rulerSign in to saveastronomical object of well-known physical size, used to determine distance via trigonometryConnectionscosmic distance ladderEntitybaryon acoustic oscillationsEntityEarthConceptastronomyEntityInternational Standard Book NumberEntitytrigonometryEntitycosmologyEntityradianEntityredshiftEntityparallaxEntityHubble–Lemaître lawEntityobservable universeEntityUniversity of British ColumbiaEntityexpansion of the universeEntityWileyEntityAmerican Physical SocietyEntitySky & TelescopeEntityluminosity distanceEntityAngular diameter distanceEntityCategoriesAstrometryLength, distance, or range measuring devices