Koj xam qhov ntev thiab sijhawm li cas?
Koj xam qhov ntev thiab sijhawm li cas?

Video: Koj xam qhov ntev thiab sijhawm li cas?

Video: Koj xam qhov ntev thiab sijhawm li cas?
Video: Nkauj tawm tshiab 2019~2020 By Vais Lav lauj 2024, Kaum ib hlis
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Vim tias ib hnub yog 24 teev ntev ib tus tuaj yeem siv tau yooj yim sij hawm rau xam longitude . Ib teev ntawm sij hawm qhov sib txawv sib raug rau 15 ° ntawm longitude (360 ° / 24 teev = 15 ° / teev). Piv txwv tias tus neeg soj ntsuam teeb tsa nws lub sijhawm saib kom raug rau 12:00 tav su hauv Greenwich, England thiab tom qab ntawd taug kev deb heev.

Ua raws li qhov no saib, lub sijhawm suav li cas?

Sijhawm yog xam los ntawm kev soj ntsuam qhov crossover ntawm cov hnub qub nyob deb thaum lawv hla trough meridian. Kev sib hloov ua tiav yuav tsum sib npaug li 24 teev, kwv yees li. Qhov no sij hawm yog faib ntawm longitudes. Raws li, ze rau cov ncej, lub sij hawm qhov sib txawv yog ntau dua rau luv luv.

puas muaj lub sijhawm universal? Universal Sijhawm (UT) yog a sij hawm txheem raws li lub ntiaj teb kev sib hloov. Nyob ntawd yog ob peb versions ntawm Universal Sijhawm , uas txawv txog li ob peb feeb. UTC yog raws li International Atomic Sijhawm , nrog leap vib nas this ntxiv kom khaws nws hauv 0.9 thib ob ntawm UT1.

Hais txog qhov no, lub sijhawm cuam tshuam li cas rau longitude?

Txhua degree ntawm longitude ntawm tus kab zauv tuaj yeem muab faib ua 60 feeb lossis arc, yog li ib feeb ntawm longitude sib npaug ib mais nautical. Txhua feeb ntawm longitude tuaj yeem muab faib ua 60 vib nas this ntawm longitude . 24 x 15 deg. rau sij hawm zone teev = 360 deg., lossis ib hnub puv.

Lub teb chaws twg yog 24 teev ua ntej Asmeskas?

Luv teb: tsis yog lub teb chaws yog 24 teev ua ntej Tebchaws Meskas . Nws nyuaj rau teb vim qhov U. S . npog ntau lub sijhawm. Dab tsi taw tes hauv U. S . koj hais txog? Hawaii yog kaum teev tom qab Greenwich txhais tau tias lub sijhawm.

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