When did Isaac Newton publish his Comprehensive Theory of Gravity?
1687
1687
1687
1687
1687
1687
1687
1687
1687
1687
1687
1687
1687
1687
1687
1687
1687
1681
1687
1676
1681
1687
1676
1681
1687
1676
1681
1687
1643
1688
1676
1681
1669
1678
1683
1682
1643
1688
1676
1666
1681
1669
1678
1683
1682
1643
1688
1676
1666
1681
1669
1678
1684
1683
1682
1643
1688
1676
1681
1679
1669
1673
1678
1666
1643
1688
1676
1684
1683
1687.
1681
1682
1679
1669
1673
1678
1643
1688
1676
1665
1666
1684
1681
1683
1667
1682
1679
1669
1673
1664
1676
1681
1678
1643
1688
1665
1666
1684
1683
1676
1681
1667
1682
1679
1669
1673
1664
1678
1687.
1643
1688
1676
1665
1666
1684
1683
1681
1668
1667
1677
1682
1679
1669
1673
1664
1676
1681
1678
1643
1688
1665
1666
1684
1683
1676
1687.
1681
1668
1667
1677
1682
1679
1669
1673
1664
1678
1643
1688
1676
1665
1666
1684
1681
1683
1668
1667
1677
1682
1679
1669
1676
1687.
1681
1673
1664
1678
1643
1688
1642
1665
1676
1666
1684
1683
1687,
1681
1668
1667
1677
1682
1679
1669
1673
1664
1687.
1678
1674
1643
1688
1681
1687,
1676
1642
1665
1666
1684
1683
1668
1667
1681.
1681