🌐EnglishEnglishDeutschEspañolFrançaisNederlandsPolskiPortuguêsSvenskaTürkçeРусскийالعربيةفارسی中文日本語EntityQ1666400· pop 20· linked from 1,176 articlesInternational Celestial Reference SystemAlso known as ICRScelestial reference system using reference celestial sources observed at radio wavelengthsAvailable in 20 languagesEspañolFrançaisDeutsch中文日本語РусскийPortuguêsالعربيةArmenianConnectionsvery-long-baseline interferometryEntityepochEntityCategoriesAstrometryAstronomical coordinate systemsFrames of reference