Surya Siddhanta
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चतुर्भिर् व्यवहारो +अत्र सौरचान्द्रार्क्षसावनैः। बार्हस्पत्येन षष्ट्यब्दम् ज्ञेयम् नान्यैस् तु नित्यशः॥
Four amongst these have been used, soura (solar), cändra (lunar), näkshtrika (sidereal) and sävana (civil). The Jupiter-measure has to be known in order to know about the cycle of sixty years. The rest are not needed for everyday use.
english translation
Chapter 14
Verse 1
Verse 3