
Valmiki in his Sanskrit text Ramayan describes the natal or birth chart of young Rama [13], and this day is celebrated as Ramanavami festival throughout India and amongst Indian diaspora [14].:
“ “On completion of the ritual six seasons have passed by and then in the twelfth month, on the ninth day of Chaitra month [March-April], when the presiding deity of ruling star of the day is Aditi, where the ruling star of day is Punarvasu (Nakshatra), the asterism is in the ascendant, and when five of the nine planets viz., Sun, Mars, Jupiter, Saturn, and Venus are at their highest position, when Jupiter with Moon is ascendant in Cancer, and when day is advancing, then Queen Kausalya gave birth to a son with all the divine attributes like lotus-red eyes, lengthy arms, roseate lips, voice like drumbeat, and who took birth to delight the Ikshwaku dynasty, who is adored by all the worlds, and who is the greatly blessed epitome of Vishnu, namely Rama.”
- Book I : Bala Kanda, Ramayana by Valmiki, Chapter (Sarga) 18, Verse 8, 9, 10 and 11 [15] ”
...happens to be the day i was born too! :)