🌐EnglishEnglishDeutschEspañolFrançaisTürkçe中文日本語EntityQ189619· pop 6· linked from 8 articlesstar diagonalAlso known as Diagonal mirror, Erecting lens, Prism diagonalaccessory for astronomical and geodetic telescopes for observing zenith nearby starsAvailable in 6 languagesEspañolFrançaisDeutsch中文Türkçevia Wikidata sitelinks · CC0ConnectionsmirrorEntitytelescopeEntityCategoriesOptical components