Rangarira ndima iri pasi apa uye ipapo pindura mubvunzo gare gare mumutauro mumwe chetewo sechikamu:  Kupfuura: Rasmus Bartholin anoyeukwa zvikurukuru nokuda kwokuwana kwake (1669) kuputsika kaviri kwerambi rechiedza neIceland spar (calcite). Akabudisa rondedzero yakarurama yechiitiko chacho, asi sezvo chimiro chechiedza chakanga chisinganzwisiswi panguva iyoyo, akanga asingakwanisi kuchitsanangura. Kwakanga kuri bedzi pashure pokunge Thomas Young ataura rondedzero yemafungu echiedza, c. 1801 kuti tsananguro yakava inobvira.  Mubvunzo: Nei Rasmus akanga asingakwanisi kutsanangura chiitiko chacho?
chimiro chomuviri chechiedza chakanga chisinganzwisiswi zvakanaka panguva iyoyo