Surya Siddhanta

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लम्बज्याघ्नस् त्रिजीवाप्तः स्फुटो भूपरिधिः स्वकः। १-६०ख तेन देशान्तराभ्यस्ता ग्रहभुक्तिर् विभाजिता ॥

The Earth's circumference multiplied by the sine of co-latitude (of the given place) and divided by the radius is the Sphuṭa or rectified circumference (i. e. the parallel of latitude), at that place. Multiply the daily motion (in minutes) by the distance of the given place from the Middle Line of the Earth, and divide the product by the rectified circumference of the Earth.

english translation

lambajyAghnas trijIvAptaH sphuTo bhUparidhiH svakaH। 1-60kha tena dezAntarAbhyastA grahabhuktir vibhAjitA ॥

hk transliteration by Sanscript