I have started watching the anime "Inuyasha". and now I have finished watching till the episode "Return to the place we first met" (Season 2, episode 21). In this episode, Kagome says to herself, on seeing the sacred tree that she met Inuyasha at the same place, 500 years ago in the past (ie: Kikyo reincarnates as Kagome, 500 years after her death).

But, so far the story has been travelling in a way that Kagome goes to the feudal era and gets introduced to Inuyasha who had been put to sleep by Kikyo's Arrow for about "50 years".

Can't understand the flow/link between this "500 years" and "5o years" thing. someone please clarify me.