समकालिक रेखा
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chattanoan mean sthit prachin chumbakatv ke adhar par unake manachitran mean saman tithiyoan ki chattanoan ko rekhaankit karane ke liye jo rekhaean bhaumikiy manachitr par khianchi jati haian unhean samakalik rekha (aangrezi: Isochrones) kaha jata hai.
- samakalik rekhaean ek nishchit kalavadhi ke dauran bani chattanoan ko unake chumbakiy gunoan ke adhar par alag-alag darshati haian.
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