Babylonian were great astronomers , and as I know they knew 7 planets so they divide the week into 7 days , for example : a great Chaldean astronomer called ( Kidinnu ) 4th century BC. , who said that the moon turning in 29 days , 12 hours , 44 minutes , 3 seconds and 3/10 of a second by using simple instruments , while the new computerized instruments said that it is 29 days , 12 hours , 44 minutes , 2 seconds and 8/10 of a second , so his mistake is less than a second , the Babylonian ( Chaldean ) discover the calender used nowadays by Hebrew , but the Babylonian year begins in the 1st of April ( Akito , still celebrate it in the north of Iraq , the Assyrian ) and as they were who invent the horoscopes , so they begin from Aries ( April ) .
If you like to see a lot of photos on Iraq / Mesopotamia , you can see this group on facebook Mesopotamia civilization :
http://www.facebook.com/home.php#/group.php?gid=22812141379
I hope you will find this helpful
bye
