pes tsawg kilometers hauv ib mais? Lo lus nug no 250-300 xyoo dhau los yuav tau baffled tsis tau tsuas yog ib tug neeg mus ncig teb chaws, tab sis kuj yog ib tug kws tshawb fawb. mais twg? Thiab ib kilometer yog dab tsi?
Lo lus " mais" los ntawm Roman milia passum, uas yog, ib txhiab kauj ruam. Cov neeg Loos hais txog qhov kev ncua deb li ib txhiab ob kauj ruam ntawm legionnaire. Qhov yuav tsum tau ntsuas qhov ntev, thiab tsis yog ntawm txoj kev xwb, tab sis kuj ntawm tus kheej cov khoom, yeej ib txwm nrog tib neeg. Qhov kev ncua deb tau khi rau lub davhlau ntawm tus xub, thiab mus rau nruab hnub lub peb hlis ntuj, thiab txawm mus rau cov kav dej - uas yog, thaum taug kev, koj haus luam yeeb ib tug xov tooj ntawm cov kav dej.
Cov npe ntawm kev ntsuas qhov ntev cuam tshuam nrog lub npe ntawm lub cev qhov chaw tau nrov tshwj xeeb. Qhov no, piv txwv li, yog lub luj tshib - 0.5 meters, ib ncua - txog 20 cm, ib tug ko taw - txog 30 cm. Lub tom kawg yog txhais los ntawm lus Askiv li "kauj ruam, ceg." Obviously, xws li ib tug system yog heev inconvenient. Tom qab tag nrho, ob txhais ceg, caj npab, thiab cov kauj ruam ntawm txhua tus neeg yog qhov ntev sib txawv.
Thaum kawg ntawm lub xyoo pua puv 19, muaj ntau tshaj plaub caug mais sib txawv hauv Tebchaws Europe los ntsuas qhov deb ntawm thaj av. Cov lus teb rau lo lus nug ntawm ntau npaum li casmais ib mais sib txawv heev txawm nyob hauv cov tebchaws nyob sib ze.
Lub mais Roman, raws li ntau qhov chaw, yog 1483 lossis 1598 meters. Nyob sib ze England thiab Scotland muaj ntau mais. Cov lus Askiv luv luv, muaj 1609 meters hauv nws, hauv Scottish - 1808 m. German mais ntev dua - 7420 meters. Qhov xwm txheej zoo sib xws hauv Russia. Ntawm no, mais tsis tshua siv los ua thaj av ntsuas qhov ntev, nws yog siv los daws cov teeb meem metric. Lavxias mais muaj xya versts, thiab nws yog 7468 meters.
Tab sis tag nrho cov ntaub ntawv nyob deb tau raug ntaus los ntawm mais ntawm Scandinavian lub tebchaws. Swedish mais muaj qhov ntev ntawm 10688 m, thiab Norwegian mais tuaj yeem thov lub npe ntev tshaj plaws - nws yog 11298 m.
Zoo, qhov xwm txheej no tsis haum ntau tus neeg. Thiab nyob rau hauv 1875 nyob rau hauv Paris, XVII lub teb chaws tau kos npe rau metric convention, uas tom qab ntawd tau koom nrog lwm lub xeev. Meters, kilometers, kilograms tau los siv. Tam sim no txhua lub teb chaws tsim kev lag luam tau ua raws li qhov kev ntsuas lej. Tam sim no teb cov lus nug: "Puas muaj pes tsawg kilometers hauv 1 mais?" yooj yim dua, txawm hais tias mais tsis siv. Qhov teeb meem rov qab los kuj daws tau yooj yim. Piv txwv li peb nyeem tias cov khoom tau sib cais los ntawm 1 mais. Tus neeg taug kev yuav tsum taug kev pes tsawg kilometers? Muaj lus teb tseeb. Muaj pes tsawg kilometers hauv ib mais yog tam sim no paub tseeb. Ib mais deb yog 1.608 km thiab nautical mais yog 1.853 km.
Nrog ib mais nautical, txhua yam pib yooj yim dua. Tom qab tag nrho, hauv hiav txwv koj tsis tuaj yeem ntsuas qhov kev ncua deb nrog cov kauj ruam. Txhawm rau teb cov lus nug ntawm pes tsawg mais hauv ib mais, cov neeg tsav nkoj yuav tsum tau tso siab rau kev suav hnub qub. Ib mais nautical yog conditionally sib npaug rau ib feeb ntawm latitude, los yog 1853 meters, yog hais tias ib lub nkoj sails ib mais nautical raws meridian, nws qhov chaw yuav hloov raws nraim ib feeb ntawm thaj chaw latitude.
Teeb, muaj me ntsis ntes ntawm no. Peb lub ntiaj teb tsis yog ib tug kheej kheej, nws yog flattened los ntawm tus ncej. Thiab nws hloov tawm hais tias nyob rau ntawm kab zauv qhov kev ncua deb sib cais ib feeb ntawm latitude los ntawm lwm tus yog me ntsis ntxiv. Yog li ntawd, muaj lwm chav ntsuas ntawm qhov deb - lub equatorial nautical mais. Nws yog 1855 meters.
