Surya Siddhanta
परमापक्रमज्या तु सप्तरन्ध्रगुणेन्दवः । (१३९७) तद्गुणा ज्या त्रिजीवाप्ता तच्चापम् क्रान्तिर् उच्यते ॥ (C इष्यते)
The sine of the (mean) greatest declination, (of each of the planets)=1307 (the sine of 24°). The Rule for finding the planet's (mean) declination from its longitude.Multiply the sine (of the longitude of a planet) by the said sine 1307; divide product by the radius 3438; find the arc whose sine is equal to the quotient. This arc is the (mean[1]) declination (of the planet required). [1.The mean declination of a planet is the declination of its corresponding point in the ecliptic: but the Sun's mean declination is the same as his true declination. B. D.]
english translation
paramApakramajyA tu saptarandhraguNendavaH । (1397) tadguNA jyA trijIvAptA taccApam krAntir ucyate ॥ (C iSyate)
hk transliteration by Sanscript