Brihat Parashara Hora Shastra
चन्द्रेण सांख्ययोगज्ञः साहित्यज्ञश्च गायकः । केतुना गणितज्ञोऽसौ राहणाऽपि तथैव च ॥ ४४॥
that one is a musician, Candr denotes a follower of Sankhya philosophy (of Maharishi Kapila, who enumerated 25 true principles with emphasis on final bliss) and indicates, that one is versed in rhetorics and singing and Ketu, or Rahu denotes, that one is a Jyotishi.
english translation
candreNa sAMkhyayogajJaH sAhityajJazca gAyakaH । ketunA gaNitajJo'sau rAhaNA'pi tathaiva ca ॥ 44॥
hk transliteration by Sanscript