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pöördpinna teljega ristuva tasandi lõikejoon; Maaellipsoidi pinnal sama laiuskraadiga punkte ühendav joon
parallel 4 . Geoinformaatika. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//geoinf/parallel/4/eng (23.09.2026)