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Hello everyone! Kya aapne kabhi socha hai ki din aur raat kaise hote hain? Ya fir mausam (seasons) kyun badalte hain? Aaj hum Geography ke Chapter 3: Motion of the Earth ko bahut simple language mein samjhenge. Chaliye shuru karte hain!" 1. Earth ki Do Tarah ki Movements "Earth do tarah se move karti hai: Rotation aur Revolution. Rotation: Jab Earth apni hi jagah par, yaani apni Axis par ghoomti hai, use Rotation kehte hain. Isme lagbhag 24 hours lagte hain, jise hum 'Earth Day' kehte hain. Revolution: Jab Earth Sun ke charon taraf ek fixed raste (orbit) mein ghoomti hai, use Revolution kehte hain. Isme 365 ¼ days lagte hain." 2. Earth ka Tilt aur Orbital Plane "Ab ek interesting baat! Earth ekdum seedhi nahi khadi hai. Earth ki axis 23.5° tilted (jhuki hui) hai. Agar hum orbital plane se dekhein, toh ye angle 66.5° banta hai. Aur yaad rakhna, Earth hamesha West to East ghoomti hai!" 3. Circle of Illumination (Din aur Raat) "Earth spherical hai, toh Sun ki light ek waqt par sirf aadhi Earth par padti hai. Wo line jo globe par 'Day' aur 'Night' ko divide karti hai, use hum Circle of Illumination kehte hain. Dhyan rahe, ye line Earth ki axis se match nahi karti kyunki Earth tilted hai." 4. Leap Year ka Logic "Hum maante hain ki ek saal mein 365 days hote hain. Par wo extra 6 hours kahan gaye? Har saal ke ye 6 ghante 4 saal tak jode jaate hain (6 \times 4 = 24 hours), jo banta hai ek poora din!