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Parikrama aur Mausam

Class 7 Science · Chapter 12: Prithvi, Chaand aur Sooraj · NCERT Curiosity section 12.2

Seekho

Ghoomte hue Prithvi Sooraj ka chakkar bhi lagaati: parikrama. Uska raasta, kaksha, upar se lagbhag vritt, aur ek chakkar lagbhag 365 din 6 ghante. Saal bhar raat mein antariksh ka alag hissa saamne aata, isliye alag mahinon mein sooryaast par alag taare ugte. Tapi ghaati ke kuch samudaay monsoon aane ka pata kuch taara-pattern dekhkar lagaate.

Prithvi ki dhuri jhuki hai, aur poori kaksha mein ye jhukaav banaaye rakhti. June mein uttari golaardh Sooraj ki or jhuka: dhoop chhote kshetra par, to zyaada tez, aur din 12 ghante se lambe: garmi. December mein door jhuka: kamzor dhoop aur chhote din: sardi. Dakshini golaardh mein ulte mausam.

Mausam Prithvi ke Sooraj ke paas hone se nahi hote: asal mein wo January mein sabse paas. Uttar mein sabse lamba din lagbhag 21 June (greeshm sankraanti) aur sabse chhota 22 December (sheet sankraanti); lagbhag 21 March aur 23 September ko din-raat barabar (vishuv). Dhruvon par chhah mahine din aur chhah mahine raat, jabki bhoomadhya rekha par saal bhar lagbhag 12-12 ghante, isliye dakshin Bharat mein mausam halke.

Explore: garmi ya sardi?

  1. Har ek sort karo.

Yaad rakho

  • Prithvi lagbhag 365¼ din mein Sooraj ki parikrama karti; raat ka aasmaan saal bhar badalta.
  • Jhuki dhuri Sooraj ki or jhuke golaardh ko tez dhoop aur lambe din deti: garmi.

Quick check

June mein Bharat mein garmi. Tab Australia mein kaunsa mausam?

  1. winter
  2. summer
  3. spring
  4. the same as India
Answer

winter. Australia dakshini golaardh mein, June mein Sooraj se door jhuka.

Socho

Dilli mein garmi ke din sardi se lambe kyun?

Ek answer

Garmi mein uttari golaardh Sooraj ki or jhuka, to Dilli har ghoornan ka aadhe se zyaada hissa dhoop mein bitaati.

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.