For your kind information ... the star positions which are mentioned in Ramayana and Mahabharat ... it has been proved that there was a time when all the stars and planets were placed exacly the same way it has been mentioned in these scriptures ... in short ... that time ... those moments did exist ...
If you don't agree with it ...
Then can you tell me ... you read history books ... have you ever seen Nepolian??? ... I bet you never did! But you believe and you know he did exist ... why??? ... because he is mentioned in History books ... and people saw him ... even though those people are no more ... you still agree that Nepolian lived on this earth ... similarly ... Ramayana is written to tell the story of a king, re-incarnation of a GOD on earth.