Mr. Hajo Alo Arab, you are wrong !
And Newroz Festival is more older than 620 b.c. as you suggested.
Too simply, human’s observation about sun and seasons and months, is much more older than your suggest 620 b.c., because it backs to era of agriculture revolution in human history. So we are speaking about 10,000 b.c. years ago.

Thank you so much Dr. Taysir Alousi for your noble feeling to share happiness and good wishing for better future to all of us, even next generations. Which I hope too.

I hope that Newroz’s sun light erases dark and obscurity, to shine a new path forward to best future.