Udayo yo lankaayaam soasthamayo: savithureva siddhapure madhyahno yavakotyaam romake vishaye ardharaathramsyaath When it is Sunrise in Lanka, the same Sun sets in Siddhapura. (Gautimaala). It is noon in Yavakoti (Korea) and midnight in Romaka (Rome) [Aryabhateeyam 4-13] MERIDIAN AND TIME: Desaanthara ghatee kshunnah madhyaa bhukthir dyuchaarinaam shashtyaa bhaktham runam praachyaam rekhaayaa: paschime dhanam. The time is calculated based on the meridian. Divide the time by 60... and the longitude is calculated. Towards the east subtract and towards the west add the number (Laghubhaskareeyam 1-31) BHASKARA I LAGHUBHASKAREEYA (628 AD) MERIDIAN AND TIME: 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) VARAHAMIHIRA - PANCHASIDDHANTIKA (605 AD)