Ko Henrietta Swan Leavitt (; Hōngongoi 4, 1868 <unk> Hakihea 12, 1921) he tohunga whetū nō Amerika. I puta ia i te Radcliffe College, i mahi ia ki te Harvard College Observatory hei "rorohiko", hei tirotiro i ngā papa whakaahua hei ine me te whakarārangi i te mārama o ngā whetū. Nā tēnei mahi i kitea ai e ia te pātahitanga i waenganui i te mārama me te wā o ngā tāupe Cepheid. I whakaratohia e te kitenga a Leavitt ki ngā tohunga whetū te "whakararamatanga tuatahi" hei ine i te tawhiti ki ngā aorangi tawhiti. I muri i tōna matenga, i whakamahia e Edwin Hubble te pātahitanga o te mārama o Leavitt, me ngā nekehanga ā-rangi i whanganga tuatahihia e Vesto Slipherwell i Lowell Observatory, hei whakapumautia kei te whakawhānui te ao (tirohia te Pātai a Hubble: He aha tana ture?
tohunga whetū