Panchaasathaa thribhisthryamsaamyuthairyojanaischa

naaddyekaa samapoorva paschimasthairnithyam sodhyaa cha deyaa cha

  One nadi for every 53 1/3yojanas has to be deducted or added (to Ujjaini) by the people in places east and west, respectively of the Ujjaini meridian. (Panchasiddhantika 9-10)]]>