Surya Siddhanta
तिथ्यर्धभोगम् सर्वेषाम् करणानाम् प्रकल्पयेत् । एषा स्फुतगतिः प्रोक्ता सूर्यादीनाम् खचारिणाम् ॥
It is to be known that all the Karaṇas answer successively to half of a tithi. (O Maya,) thus I have explained to you the Rules for finding the true places of the heavenly bodies, the Sun &c.
english translation
tithyardhabhogam sarveSAm karaNAnAm prakalpayet । eSA sphutagatiH proktA sUryAdInAm khacAriNAm ॥
hk transliteration by Sanscript