Brihat Parashara Hora Shastra
चेष्टाकेन्द्राच्च तद्रश्मिं साधयेदुच्चरश्मिवत् । चेष्टाकेन्द्रं कुजादीनां पूर्वमुक्तं मया द्विज ॥ ३॥
Chesht Rasmi. Chesht Rasmis are to be calculated from Chesht Kendr similar to Uchch Rasmi computations. The Chesht Kendras of Grahas from Mangal to Śani have already been explained. Add 3 Rāśis to Sayan Sūrya (i.e. with Ayanāńś), which will be the Chesht Kendr for Sūrya.
english translation
ceSTAkendrAcca tadrazmiM sAdhayeduccarazmivat । ceSTAkendraM kujAdInAM pUrvamuktaM mayA dvija ॥ 3॥
hk transliteration by Sanscript