Surya Siddhanta
स्वमन्दभुक्तिसम्शुद्धा मध्यभुक्तिर् निशापतेः।दोर्ज्यान्तरादिकम् कृत्वा भुक्ताव् ऋणधनम् भवेत् ॥
Subtract the diurnal motion of the Apogee of the Moon from her mean diurnal motion; (the remainder will be the Moon's motion from her apogee;) from this remainder find the 1st equation of her motion (by the rule which will be explained further on). This equation is to be subtractive or additive to her mean motion (for finding the true motion of the moon).
english translation
svamandabhuktisamzuddhA madhyabhuktir nizApateH।dorjyAntarAdikam kRtvA bhuktAv RNadhanam bhavet ॥
hk transliteration by Sanscript