Magana: Wannan bayanin na planetarium ko orrery ne. Pappus na Alexandria ya bayyana cewa Archimedes ya rubuta rubutun (yanzu ya ɓace) a kan gina waɗannan hanyoyin da ake kira On Sphere-Making. Bincike na zamani a wannan yanki ya mai da hankali kan tsarin Antikythera, wani na'urar da aka gina c. 100 BC wanda wataƙila an tsara shi don wannan dalili. Gina irin waɗannan hanyoyin zai buƙaci ƙwarewar ilimin daban-daban. An taɓa tunanin cewa wannan ya kasance bayan kewayon fasahar da ake da ita a zamanin da, amma ganowar tsarin Antikythera a cikin 1902 ya tabbatar da cewa an san na'urorin irin wannan ga tsoffin Helenawa. Tambaya: Yaushe aka sami wata tsohuwar hanyar?
Shekara ta 1902