A dioptra (qee zaum kuj hu ua dioptre lossis diopter, los ntawm Greek: διόπτρα) yog ib qho khoom siv astronomical classical thiab kev sojntsuam, yos los ntawm xyoo pua 3 BC.
Leej twg invented dioptra?
Nyob rau hauv nws txoj kev ua lej, lossis Almagest, Claudius Ptolemy (2nd C. C. E.) khab nias Hipparchus ntawm Nicaea (2nd C. B. C. E.) nrog kev tsim khoom, hu ua diopter, rau ntsuas qhov ntsuas. pom meej diameters ntawm lub hnub thiab hli.
Dioptra siv rau dab tsi?
Lub dioptra yog thawj qhov ntsuas ntsuas tsim los ntawm Greek Astronomers siv ntsuas cov kaum.
Dioptra ua haujlwm li cas?
Dioptra automatically siv lub koom haum cov ntaub ntawv kev lag luam nyiaj txiag(saib Cov Ntaub Ntawv Txuas hauv qab) rau kev tshuaj xyuas. Los ntawm kev sau cov ntaub ntawv automation, lub sij hawm xav tau los soj ntsuam tus nqi yuav raug txo los ntawm ob peb hnub mus rau ob peb teev, txo qis lub nra ntxiv rau cov neeg ua haujlwm hauv kev ua haujlwm txhua hnub.
Dioptra tau tsim nyob qhov twg?
Hu "ib qho ntawm kev ua haujlwm zoo tshaj plaws ntawm lub sijhawm qub," nws yog qhov tob 1, 036 meters (4,000 ft) ntev, "excavated through Mount Kastro ntawm Greek kob ntawm Samos, nyob rau xyoo 6th BCE" thaum lub sij hawm kav ntawm Polycrates.
