Zameen apne mehwar par ghoomti hai, is liye sooraj har jagah ek hi waqt par tulu nahi hota. Purane zamane mein har sheher apna waqt sooraj se tay karta tha — aur jab tak safar susat tha, is se koi mushkil nahi hoti thi.
Railway ne ye mushkil paida ki. Jab train ek sheher se doosre sheher chand ghanton mein pohanchne lagi to har sheher ka apna waqt time table banana namumkin bana deta tha. Isi wajah se muqarrara time zones ka nizaam qaim hua.
Aaj har waqt ko UTC (Coordinated Universal Time) se naapa jata hai. Har mulk apna waqt UTC se aage ya peeche batata hai — jaise Pakistan UTC+5. Kuch mulkon ne apni jugrafiyai zaroorat ke tehat aadha ghanta ya pauna ghanta ka farq ikhtiyar kiya hua hai, jaise India UTC+5:30 aur Nepal UTC+5:45.
Bunyadi baatein
- UTC duniya ka meyaari waqt hai
- Har mulk ka waqt UTC se aage ya peeche batata jata hai
- Kuch mulkon mein aadhe ya pauna ghante ka farq hai
- Bara mulk chahe to poore raqbe par ek hi zone rakh sakta hai