
Gunter quadrant
1650-1725
1650-1725
2000-100 BCE
1696-1700
1671-1730
1668-1672 Probable
1750
1720
1701-1730
1701-1750
1742
1701-1750
1685-1724
circa 1711
1665-1670
1700-1720
1650-1725
circa 1750
1708
1675-1700
1680
1695-1702
1671-1730
1685-1695
1673
1663
1660-1665
1660-1665
1660-1665
1660-1665
1697
1663
1717-1725
1690-1710
Made late 1700s, modified 1800s
1725
1725
1666
1680-1700
1730
4000-2001 BCE
1990-96
1701-1730
1701-1730
1701-1723
1701-1750
1704-1728
1717
1650-1700
1730-1750
1681