English

Prithvi ka Ghoornan

Class 7 Science · Chapter 12: Prithvi, Chaand aur Sooraj · NCERT Curiosity section 12.1

Seekho

Samudra kinaare school jaate Meher dekhti ki naariyal ke pedon ki chhaaya subah lambi aur dopahar chhoti. "Sooraj aasmaan mein chalta hoga," wo sochti. "Par humne padha Prithvi chalti hai. To sach kya?"

Vaamaavart ghoomte jhoole par Kabir dekhta ped aur imaaratein dakshinaavart, ulti disha mein, guzarte dikhte. Waise hi Prithvi apni dhuri par Pashchim se Poorab ghoomti (uttari dhruv ke upar se vaamaavart), to Sooraj sirf dikhta hai ki Poorab mein ugta, aasmaan paar karta aur Pashchim mein doobta. Ek ghoornan lagbhag 24 ghante.

Andhere kamre mein globe aur torch se dost dekhte aadha globe roshan (din) aur aadha andhera (raat). Globe Pashchim se Poorab ghumaane par Bharat ka sticker roshni mein (sooryoday) aur baad mein andhere mein (sooryaast). Poorvi Bharat mein sooryoday pehle. Bharat ki nayi Sansad imaarat mein 22 m lamba vishaal Foucault pendulum Prithvi ke ghoornan ka pradarshan hai.

Raat mein Saptarishi Dhruv taare ke chaaron or ghoomta dikhta, jo mushkil se hilta kyunki Prithvi ki dhuri lagbhag usi ki or. Lambe exposure photo mein taaron ki lakeerein chaap ki tarah. 1500 se zyaada saal pehle Aryabhata ne ise chalti naav mein baithe vyakti se milaaya jise kinaara peechhe jaata dikhta, aur ek ghoornan ka unka maan, lagbhag 23 h 56 min, aaj ke bahut paas.

Yaad rakho

  • Prithvi apni dhuri par lagbhag 24 ghante mein Pashchim se Poorab ghoomti, din-raat hote.
  • Isliye Sooraj, Chaand aur taare Poorab mein ugte, Pashchim mein doobte dikhte; Dhruv taara sthir dikhta.

Quick check

Sooraj Poorab mein ugta kyun dikhta?

  1. Prithvi Pashchim se Poorab ghoomti
  2. Sooraj roz Prithvi ka chakkar lagaata
  3. Poorab garam
  4. Chaand Sooraj ko upar dhakelta
Answer

Prithvi Pashchim se Poorab ghoomti. Hum Sooraj ko ghoomti Prithvi se dekhte.

Socho

Agar Prithvi Poorab se Pashchim ghoomti, Sooraj kahaan ugta?

Ek answer

Wo Pashchim mein ugta aur Poorab mein doobta dikhta, kyunki Sooraj ki aabhaasi gati hamesha Prithvi ke ghoomne ke ulat.

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.