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 1680 1690 1700 1710 1720 1730 1740 1750 1760 1770 1780 1790 1800 1810 1820 1830 1840 1850 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1910 1920 1930 1940 1950 1960 1970 1980 1990 2000 2024 2100 2200 2300 2400 2500 3000 January February March April May June July August September October November December -- starts at 1882-01-02