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(polaaraladel:) ajavahemik, mil päike on horisondi taga üle ühe ööpäeva
полярная ночь . Koolisõnastikud 2005–2010. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//kool_KV/%D0%BF%D0%BE%D0%BB%D1%8F%D1%80%D0%BD%D0%B0%D1%8F%20%D0%BD%D0%BE%D1%87%D1%8C/1/rus (04.10.2026)