Sri Rama Birth Slo:ka from Valmiki Ramayana:

thathascha dwa:dase: ma:se: chaitre: na:vamike:thithau
nakshathrye: adithi daivathye: svo:chcha samasthe:shu panchashu
grahe:shu karkate: lagne: va:kpatha: vinduna:saha
pro:dyama:ne: jaganna:tham sarvalo:ka namaskrutham
kausalya: janayad ra:mam sarvalakshana samyutham
vishno:rartham maha:bha:gam puthram aikshva:ku vardhanam
lo:hitha:ksham maha:ba:hum raktha o:stham dundubhi svanam

The One does not have birth had to take birth. At the end of 12th month, during the month of Chaithra, on a navami day in the constellation of mesha, in karkataka lagnam during the noon, when 5 planets were in a prosperous state, He was born to Kausalya to set an example of righteous living to one and all.

Vijaya Na:ma Samvathsara Calendar & Pancha:ngam