Sym454 -9000 -8000 -7000 -6000 -5000 -4000 -3000 -2000 -1000 0 300 400 500 600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1610 1620 1630 1640 1650 1660 1670 1680 1690 1700 1710 1720 1730 1740 1750 1760 1770 1780 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1840 1850 1860 1870 1880 1890 1900 1910 1920 1930 2000 2024 2100 2200 2300 2400 2500 3000 January February March April May June July August September October November December -- starts at 1816-01-01