ghoornan kaal

apne ghoornan aksh par ghoornan karta hua ek gola

bhautiki mein, ghoornan kaal (rotation period) us samay ke avadhi ko kehte hain jismein koi ghoornan karti hui (yaani lattoo ki tarah ghoomti hui) vastu apne ghoornan aksh ke ird-gird ek chakkar poora kar leti hai. udaaharan ke liye, pruthvi apne aksh par lagbhag chaubees ghante (yaani lagbhag ek din) mein ek chakkar poora kar leti hai, isliye usaka ghoornan kaal lagbhag ek din hai.

hamaare saur mandal ka sooraj bhi ghoornan kar raha hai lekin chooainki vah poora gas ka bana hai aur usamein pruthvi jaisi sakhti naheen hai isliye usaka madhya hissa uske dhruvon ki apeksha jaldi ghoornan karta hai. sooraj ki madhya rekha par ghoornan kaal 25 din 9 ghante 7 minute hai, jabki uske dhruvon ka ghoornan kaal 35 din hai.

inhein bhi dekhein