1817 1818 1819 1820 1821 1822 1823
1790 1800 1810 1820 1830 1840 1850
16 17 18 19 20 21 22
-1 0 1 2 3 4 5
1820 se 1820m ane nan almanak gregoryen.
Gade osi nonm 1820.