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Grahan

Class 7 Science · Chapter 12: Prithvi, Chaand aur Sooraj · NCERT Curiosity section 12.3

Seekho

Zoya haath bhar door angootha uthaakar ek aankh band karti: wo 5 m door Neel ka sir poora chhupa deta! Kisi cheez ka dikhne ka maap uske asli maap aur doori par. Chaand Sooraj se lagbhag 400 guna chhota par lagbhag 400 guna paas bhi, to dono aasmaan mein lagbhag barabar dikhte. Shukra, Chaand se bada hokar bhi, itna door ki Sooraj ke aage chhota bindu dikhta.

Jab Chaand Sooraj aur Prithvi ke beech aata, uski chhaaya Prithvi ke chhote hisse par: soorya grahan. Us hisse mein Sooraj kuch minute poora chhupa (poorna); aas-paas sirf kuch hissa (aanshik). Chaand aage badhne par chamakti "heere ki angoothi" dikh sakti. Sooraj ko kabhi seedhe mat dekho, grahan mein ya dhoop ke chashme ya doorbeen se bhi nahi: sahi filter wale planetarium ya khagol club ke kaaryakram mein jao, ya Sooraj ka pratibimb deewaar par daalo.

Jab Prithvi Sooraj aur Chaand ke beech aati, Prithvi ki chhaaya poore Chaand par: chandra grahan. Poorna chandra grahan mein Chaand gehra laal; aanshik mein kuch hissa chhaaya mein. Ise nangi aankh se dekhna surakshit. Grahan se kabhi log darte the, par Surya Siddhanta jaise granthon ke Bharatiya khagolvidon ne inhe pehle se ganana kiya; aaj vaigyaanik inhe padhne duniya bhar jaate. Bharat ki Kodaikanal Solar Observatory 1899 se Sooraj dekh rahi, aur M. K. Vainu Bappu aadhunik Bharatiya khagolshaastra ke pita kehlaate.

Explore: soorya ya chandra grahan?

  1. Har visheshta sort karo.

Yaad rakho

  • Soorya grahan: Sooraj aur Prithvi ke beech Chaand; Sooraj ko kabhi seedhe mat dekho.
  • Chandra grahan: Sooraj aur Chaand ke beech Prithvi; Chaand laal ho sakta aur dekhna surakshit.

Quick check

Kis grahan mein Chaand Sooraj aur Prithvi ke beech?

  1. solar eclipse
  2. lunar eclipse
  3. both
  4. neither
Answer

solar eclipse. Chandra grahan mein Prithvi beech mein.

Socho

Har amaavasya ko soorya grahan kyun nahi hota?

Ek answer

Chaand ki kaksha Prithvi ki kaksha se thodi jhuki, to zyaadatar mahinon Chaand Sooraj-Prithvi ki rekha se thoda upar ya neeche se guzarta.

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.