1201 - The city of Riga is established.
1686 - A satellite is observed that orbits around Venus.
1834 - The volcano Vesuvius erupts.
1868 - French astronomer Pierre Janssen reveals a helium in the solar spectrum during the eclipse of the Sun.
1926 - The first map of the weather forecast is presented.
DAY OF THE ARMY OF THE REPUBLIC OF MACEDONIA (ARM)
