Zitukuko zambiri zakale zinali ndi lingaliro la nthawi, ngakhale zinali zosamveka. Mwachidziwikire, ankadziwa kuti tsiku limayamba dzuwa litatuluka komanso usiku pomwe dzuwa limasowekera. Koma Asumeri akale, poyang'ana kuthambo, adapanga dongosolo lovuta kwambiri. Anazindikira kuti zinali zotheka kugawa maolawo mu mphindi 60 ndipo masikuwo kukhala maola 24, ndikupanga njira zoyezera nthawi zomwe zikugwiritsidwa ntchito masiku ano.
Luntha la lingaliro la nthawi yopangidwa ndi Asumeriya
Sumer, kapena "dziko la mafumu otukuka", adakula ku Mesopotamia, komwe lero kuli Iraq amakono, pafupifupi 4,500 BCE. Anthu a ku Sumeri adapanga chitukuko chotsogola chokhala ndi chilankhulo ndi kulemba, zomangamanga ndi zaluso, zakuthambo ndi masamu. Ufumu wa Sumerian sunakhalitse. Komabe, kwa zaka zoposa 5,000, dziko lapansi lidakhalabe lodzipereka kumatanthauzidwe ake anthawi.
Anthu a ku Sumeri poyamba ankakonda nambala 60, chifukwa inali yogawanika mosavuta. Chiwerengero cha 60 chitha kugawidwa ndi 1, 2, 3, 4, 5, 6, 10, 12, 15, 20 ndi 30 magawo ofanana. Kuphatikiza apo, akatswiri azakuthambo akale amakhulupirira kuti pamakhala masiku 360 pachaka, nambala yomwe 60 imakwanira bwino kasanu ndi kamodzi.
Anthu akale ndi kupita kwa nthawi
Zotukuka zambiri zamakedzana zinali ndi lingaliro la kupita kwa nthawi. monga kupita kwa masiku, masabata, miyezi ndi zaka. Mwezi unali kutalika kwa mwezi wathunthu, pomwe sabata inali nthawi yayitali yoyendera mwezi. Chaka chitha kuyerekezedwa potengera kusintha kwa nyengo komanso malo omwe dzuwa limalowera. Anthu akale anazindikira kuti kuyang'ana m'mlengalenga kumatha kuyankha mayankho ambiri pamafunso omwe anali ovuta m'masiku awo.
Pamene chitukuko cha Asumeri chidayamba kuwonongeka, pogonjetsedwa ndi Akkadiya mu 2400 BCE ndipo pambuyo pake ndi Ababulo ku 1800 BCE, chitukuko chilichonse chatsopano chimayamika njira zachiwerewere zopangidwa ndi Asumeri ndikuziphatikiza ndi masamu awo. Mwanjira imeneyi, lingaliro logawa nthawi mu 60 mayunitsi lidapitilira ndikufalikira padziko lonse lapansi.
Ola limodzi ndi tsiku la maola 24
Pamene ma geometry adavumbulutsidwa ndi Agiriki ndi Asilamu, akale adazindikira kuti nambala ya 360 sinali nthawi yokhayo yomwe dziko lapansi limazungulira, komanso muyeso woyenera wa bwalo, wopanga madigiri 360. Njira zogonana zinayamba kulimbitsa malo ake m'mbiri, kukhala zofunikira pamasamu ndi kuyenda (Dziko lapansi ligawika m'madigiri a kutalika ndi kutalika). Pambuyo pake, nkhope ya wotchi yozungulira idagawika kukhala yoyera, yopanda malire yomwe imapatsa maola 24, ola lililonse ndi mphindi 60, mphindi iliyonse yokhala ndi masekondi 60.
