1. AstronomyTop100.com Ancient Artifacts Category

Here's your chance to speak out. What do you consider the top five greatest ancient artifacts in astronomy and space exploration?

* 1. Please rank order your top five choices from 1 (your top choice) to 5 (your fifth choice)

  1 2 3 4 5
Nasca Lines
Mayan Calendar
Nebra Sky Disk
Babylonian Astronomy Records
Chinese Astronomy Records
Antikythera mechanism
Dropa Stones
The Number Zero
The Roman Calendar