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Sthaaniya Samay aur Maanak Samay

Class 6 Social Science · Chapter 1: Dharti par Jagah Dhoondhna · NCERT Exploring Society: India and Beyond section 1.3

Seekho

Meher ka cousin Farhan London mein rehta hai. Jab Meher school ke baad shaam 6 baje video call karti hai, Farhan abhi lunch kha raha hota hai! Suraj pehle poorv mein ugta hai, isliye poorv ki jagahon par suryoday, dopahar aur suryaast pehle hote hain.

Dharti 24 ghante mein poora chakkar (360°) ghoomti hai. To ye har ghante 15°, ya har 4 minute mein 1° ghoomti hai. Har 15° poorv jaane par sthaaniya samay 1 ghanta aage; har 15° paschim par 1 ghanta peeche.

Sthaaniya samay usi jagah ke Suraj par aadhaarit hai: jab Suraj sabse ooncha ho to dopahar. Par agar har shehar apna samay rakhe to rail aur daftar ulajh jaayenge! Isliye desh maanak samay ke liye ek meridian chunta hai. Bhaarat 82.5°E (Uttar Pradesh ke Mirzapur ke paas) use karta hai: Bhaarateeya Maanak Samay (IST) 82.5 × 4 = 330 minute, yaani Greenwich se 5 ghante 30 minute aage.

Russia ya USA jaise bade desh kai meridians tak faile hain, isliye kai time zones use karte hain. Bhaarat ke poorvi aur paschimi sire sthaaniya samay mein lagbhag 2 ghante alag hain, phir bhi poora desh ek IST maanta hai.

Explore: poorv aur paschim yaatra karo.

  1. Greenwich par dopahar 12 baje hain. Aisi jagah dhoondo jahan 3:00 PM ho.
  2. Ab aisi jagah dhoondo jahan 8:00 AM ho.
  3. 7.5° ke kadam se IST ke meridian (82.5°E) par jaao. Wahan kya samay hai?

Yaad rakho

  • Dharti har ghante 15° ghoomti hai: poorv mein samay aage, paschim mein peeche.
  • Bhaarateeya Maanak Samay 82.5°E par aadhaarit hai aur Greenwich se 5 ghante 30 minute aage hai.

Quick check

Dharti ek ghante mein kitne degree ghoomti hai?

  1. 15°
  2. 24°
  3. 1°
  4. 60°
Answer

15°. 360° ÷ 24 ghante = 15° prati ghanta.

Socho

Arunachal Pradesh mein suryoday Gujarat se lagbhag 2 ghante pehle hota hai. Kuch log uttar-poorv Bhaarat ke liye alag time zone kyun chaahte honge?

Ek answer

IST se wahan Suraj bahut jaldi ugta aur dhalta hai, to daftar aur school khulne se pehle kaafi din ki roshni nikal jaati hai. Alag time zone ghadi ko roshni se behtar milaa sakta hai, par ek IST poore desh ke liye cheezein saral rakhta hai.

Practice

Teen levels (easy, medium, hard) ke naye sawaalon se practice karo, kuch hands-on, hints aur hal ke saath. Topic poora karne ke liye pichhle 5 mein se 4 sahi karo.