Wikipedia:Selected anniversaries/April 23

April 23: World Book Day; Yom Hazikaron in Israel (2007); National Sovereignty and Children's Day in Turkey; St George's Day in various countries.

Hall of the Grand National Assembly of Turkey

• 1014 - Irish forces led by Brian Boru clashed with the Vikings in the Battle of Clontarf.

• 1827 - Irish mathematician and physicist Rowan Hamilton presented his Theory of Systems of Rays.

• 1920 - The Grand National Assembly of Turkey (modern hall pictured) was founded in Ankara in the midst of the Turkish War of Independence.

• 1923 - Gdynia was inaugurated as a Polish seaport on the south coast of the Baltic Sea.

• 1954 - Batting against Vic Raschi of the St. Louis Cardinals, Hank Aaron of the Milwaukee Braves hit the first of his 755 home runs in Major League Baseball.

Recent days: April 22 – April 21 – April 20

More anniversaries:

• March 31
• April 1
• April 2