Ramayana
ततो यज्ञे समाप्ते तु ऋतूनां षट् समत्ययुः । ततश्च द्वादशे मासे चैत्रे नावमिके तिथौ ॥ १-१८-८
Six seasons (one year) passed after the completion of the sacrifice. In the twelfth month of Chaitra on the ninth day (of the bright fortnight), when it is punarvasu-nakshatrayukta-navamI tithi, i.e., when the ruling star of that ninth day is punarvasu - ॥ 1-18-8॥
english translation
tato yajJe samApte tu RtUnAM SaT samatyayuH । tatazca dvAdaze mAse caitre nAvamike tithau ॥ 1-18-8
hk transliteration by Sanscript