Brihat Parashara Hora Shastra
भादिं खगं खगैः सूर्यैर्हत्वा तद्भगणादिकम् । कृत्वाऽर्क्रशेषितं ज्ञेयमब्दाद्यंशायुषः स्फुटम् ॥ १९॥
Multiply the longitude in question by 108. If the product exceeds 12, expunge multiples of 12 and consider the final product in Rāśis, degrees etc., as years, months etc.
english translation
bhAdiM khagaM khagaiH sUryairhatvA tadbhagaNAdikam । kRtvA'rkrazeSitaM jJeyamabdAdyaMzAyuSaH sphuTam ॥ 19॥
hk transliteration by Sanscript