अयनांत
ayanaant (aangrezi: Solstice) soory ki parikrama karane ke dauran prithvi ki vah sthiti jisamean usaki dhuri ka jhukav, usaki parikrama ke tal par adhikatam 23½° hota hai. aisi sthiti varsh mean do bar 21 joon/22 joon aur 22 disanbar/23 disanbar ko hoti hai. joon ki sthiti mean uttari golarddh soory ki or jhuka hua hota hai. isalie us samay us golarddh mean sabase adhik garmi hoti hai tatha din sabase b da hota hai. is sthiti ko “grishm ayanaant” kahate haian. 22/23 disanbar ko dakshini golarddh ka jhukav soory ki or hota hai. isalie us samay us golarddh mean sabase adhik garmi hoti hai. is sthiti ko “shit ayanaant” kahate haian kyoanki us samay uttari golarddh mean shit rritu hoti hai.
amataur par yah samajha jata hai ki garmi (uttari garmi) mean prithvi ka uttari golarddh soory ke nikatatam hota aur sardi (uttari sardi) mean vah bhag soory se adhikatam doori par rahata hai. par vastavikata aisi nahian hai. 1 janavari ke asapas prithvi ka uttari golarddh soory ke nikatatam hota hai aur 1 julaee ke asapas sabase door. in donoan sthitiyoan mean lagabhag 40 lakh ki.mi. ka aantar hota hai parantu isake karan prithvi ko soory se prapt hone vali oorja ki matra mean keval 7 pratishat ki hi kami hoti hai. vah samay jab soory bhoomadhy rekha ke uttar athava dakshin apane adhikatam ooanchaee par hota hai aur donoan ayan vritoan mean se kisi ek (kark rekha athava makar rekha) par lambavath chamakata hai. is sthiti mean bhoomadhy rekha se soory ka jhukav adhikatam ( 230 -30`) hota hai.
lagabhag 21 joon ko dopahar ko jab soory kark rekha par sir ke thik oopar rahata hai, ise uttar ayanaant ya kark sankraanti kahate haian. is samay uttari golarddh mean sarvadhik lambe din hote haian aur grishm rritu hoti hai jabaki dakshini golarddh mean isake viparit sarvadhik chhote din hote haian aur shit rritu ka samay hota hai. atah kark sankraanti ko uttari golarddh mean grishm sankraanti aur dakshini golarddh mean shit sankraanti bhi kahate haian. lagabhag 22 disambar ko jab soory dopahar ko makar rekha par sir ke thik oopar hota hai, isaka dakshini jhukav adhikatam (230 30`) hota hai. ise dakshini ayanaant ya makar sankraanti kahate haian. is samay dakshini golarddh mean din ki lambaee adhikatam tatha uttari golarddh mean nyoonatam hoti hai. makar sankraanti ko vahaan vidyaman rritu ke anusar uttari golarddh mean shit sankraanti aur dakshini golarddh mean grishm sankraanti ke nam se bhi jana jata hai.
|
|
|
|
|
|