madhyaahn rekha

madhyaahn rekha ya yaamyottar pruthvi ke uttari evam dakshini dhruv ke milaane waali aur uttar-dakshin disha mein kheenchi gayi kaalpanik rekhaaon ko kehte hain.

pradhaan madhyaahn rekha

madhyaahn rekha ki sthiti (lambavat)
greenavich shahar mein madhyaahn rekha

pruthvi ke beecho-beech 0° deshaantar par kheenchi gayi madhyaahn rekha pradhaan madhyaahn rekha, pradhaan yaamyottar, ya greenavich rekha kahalaati hai. duniya ka maanak samay isi rekha se nirdhaarit kiya jaata hain (koradinetid yunivrsal time -UTC). landan ke ek shahar greenavich isi rekha par sthit hain isaliya ise greenavich rekha bhi kehte hai. pradhaan madhyaahn rekha ke poorv ne sthit 180° tak ke deshaantar, poorvi deshaantar tatha pashchim ki or sthit deshaantar, pashchimi deshaantar kahalaate hain.