Matimu ya ku hlera nkarhi i matimu ya vanhu hi voxe — ku lava ka hina loku ku nga heli ku pima na ku avelana nkarhi ku susumetile tithekinoloji leti cinceke misava. Sweswi, loko hi languta eka xivandla xa n'weti, hi engeta xiyenge xintshwa eka matimu lawa ya khale.
Ku Hlera Nkarhi ka Khale (3500 BCE – 1500 CE)
Switirhisiwa swo sungula swa ku hlera nkarhi swi tirhise swikombiso swa ntumbuluko:
• Tiwachi ta dyambu (kwalomu ka 3500 BCE): Va-Egypt na va-Babiloni va tirhise ndzhuti wa dyambu ku avelana siku eka tiawara • Tiwachi ta mati (kwalomu ka 1500 BCE): Ti pfumelelile ku hlera nkarhi hi vusiku naswona ti tirhisiwile hi va-Egypt, va-Greece, na va-China • Tiwachi ta xixe: Ti tirhisiwile eka makereke ya le Yurobha ku hlera tiawara ta xikhongelo • Tikhalendara ta n'weti: Mintlawa yo tala yi seketele tikhalendara ta yona eka swiyenge swa n'weti — xiyenge xa masiku ya ~29.5 xi endlile masungulo ya "n'hweti"
Ku hlera nkarhi ka khale a ku ri ka kwalaho na ka xibalo — ku hleha ka "awara" ku cinca hi xiseziní na ku ya hi ndhawu.
Xithekinoloji xa Mechanical (1300 – 1800)
Ku endliwa ka tiwachi ta mechanical ku cince hinkwaswo:
• Tiwachi to sungula ta mechanical (kwalomu ka 1300): Ti vonakile eka makereke ya le Yurobha, loku ku katsa ku pima tiawara • Wachi ya pendulum ya Huygens (1656): Ku kongomeka eka timinete ti nga ri tingani hi siku — ku antswisa swinene ku suka eka tiawara hi siku • Tiwachi ta le lwandle (1761): H4 ya John Harrison yi lulamise xiphiqo xa longitude, yi pfumelela ku famba hi lwandle loku kongomekaka • Ku vekiwa ka nkarhi wo sungula: Tindlela ta le nkurhwini ti lavile nkarhi lowu hlanganisiweke exikarhi ka madoroba — masungulo ya timezone ta sweswi
Nkarhi wa Athomu na UTC (1955 – Sweswi)
Lembe ra 20 ri tisile ku kongomeka loku nga ha tiviwiki:
• Wachi yo sungula ya athomu ya cesium (1955): NPL eka UK yi endlile wachi leyi tirhisaka ku shiveringa ka athomu ya cesium-133 • Ku hlamuseriwa ka sekonde (1967): Sekonde yi hlamuseriwe tanihi 9,192,631,770 ya tixiyenge ta ku rherhanya ka cesium-133 • UTC yi vekiwe (1972): Nkarhi wa Misava Hinkwayo lowu Hlanganisiweke wu ve nkarhi wo sungula wa misava, wu tirhisa leap seconds ku sinkhronayzwa na ku birihela ka Misava • GPS (1978+): Tisatelayiti ta GPS ti lava nkarhi lowu kongomekaka eka nanosecond, ku tiyisisa ku biha ka ku hlera nkarhi loku kongomekaka eka vutomi bya siku na siku
Ku Nonoha ka Nkarhi Hikwa Ndhavuko: Einstein Wu Cinca Hinkwaswo
General Relativity ya Einstein (1915) yi kombisile leswaku nkarhi a hi wo tiyiseka — wu khumbhiwa hi ndhavuko na rivilo:
• Ndhavuko ya ku kukerisa leyi tiyeke = nkarhi lowu fambaka wu nonoka: Tiwachi eka ndhawu laha ndhavuko ya ku kukerisa yi tiyeke kona ti nonoka ku ri na leti nga eka ndhawu laha yi nga yitsongo kona • Ku tiyisiswa ko sungula (1959): Ku ringanyeta ka Pound-Rebka ku pimile ku hambana ka nkarhi hikwa ndhavuko eka xivandla xa Misava • Matirhiselo ya siku na siku: Tisatelayiti ta GPS ti lulamisa ku nonoha ka nkarhi hikwa ndhavuko siku na siku — handle ka sweswo, tindhawu ta tindhawu ti ta va ti pimisiwile hi tikhilomitara
Xikombiso lexi xi biha swinene eka N'weti, laha ndhavuko ya ku kukerisa leyi ntsongo yi endla tiwachi ti hatla hi ~56µs hi siku.
Nkarhi wa N'weti: Xiyenge Xo Landzela
Sweswi hi yimile eka masungulo ya era yintshwa ya ku hlera nkarhi:
• 2024: White House yi lerisa NASA ku vumba Nkarhi wa N'weti lowu Hlanganisiweke (LTC) • 2024: NIST yi tiyisisa mpimo wa ku hambana ka microseconds ta ~56 hi siku • 2025-2026: Ku tirhisana ka matiko ya misava ku vumba nkarhi lowu • Vulavula: Tiwachi ta athomu eka xivandla xa N'weti ti ta nyika nhlavutelo ya nkarhi ya xiviri ya kwalaho
Ku suka eka tiwachi ta dyambu ta khale ku ya eka tiwachi ta athomu eka N'weti — nandzu wa vanhu wo hlera nkarhi wu ya emahlweni. LTC yi kombela goza ro landzela ra ndlela leyi — ku yisa ku hlera nkarhi loku kongomekaka ku tlula Misava ro sungula eka matimu.
Ku Hlanganisa: Ku suka eka Tindzhuti ku ya eka Tinyeleti
Matimu ya ku hlera nkarhi ya kombisa ndlela leyi xithekinoloji yi susumetiwaka hi ku lava:
• Vurimi byi susumetile tikhalendara ta n'weti na ta dyambu • Ku famba hi lwandle ku susumetile tiwachi to kongomeka ta le lwandle • Tindlela ta le nkurhwini ti susumetile timezone ta nkarhi wo sungula • Thekinoloji ya athomu yi susumetile UTC na nkarhi lowu kongomekaka swinene • Vulavisisi bya xivandla sweswi byi susumetela LTC — nkarhi wo sungula lowu tikaka eka xivandla xin'wana
Nkarhi wun'wana na wun'wana loko vanhu va fikela eka ndhawu yintshwa kumbe va sungula thekinoloji yintshwa, ndlela ya hina ya ku hlera nkarhi yi cinca. Nkarhi wa N'weti lowu Hlanganisiweke i xikombiso xa sweswi xa matimu lawa — ku yisa nkarhi wa vanhu eka N'weti.