International Day of Human Space Flight: This day celebrates the anniversary of the first human space flight made by Yuri Gagarin on April 12, 1961.
National Grilled Cheese Sandwich Day: This day celebrates the cheesy, comforting goodness of grilled cheese sandwiches, a classic comfort food enjoyed by many around the world.
International Day for Street Children: This day is observed to raise awareness about the plight of street children around the world and to promote their rights and well-being.
International Day of Pink: This day is aimed at promoting diversity, inclusion, and respect for all individuals, regardless of their gender identity, sexual orientation, or other factors.
Cosmonautics Day: This day is celebrated in Russia and other former Soviet republics to commemorate the first manned space flight made by Yuri Gagarin on April 12, 1961.
1204: The Fourth Crusade captures and sacks Constantinople, the capital of the Byzantine Empire.
1606: The Union Flag, also known as the Union Jack, is adopted as the flag of England and Scotland.
1776: The North Carolina Provincial Congress authorizes the creation of the Continental Navy, which later becomes the United States Navy.
1861: The American Civil War begins as Confederate forces attack Union troops at Fort Sumter in South Carolina.
1945: U.S. President Franklin D. Roosevelt dies in office, and is succeeded by Vice President Harry S. Truman.
1961: Soviet cosmonaut Yuri Gagarin becomes the first human to travel into space, aboard the Vostok 1 spacecraft.
1981: The first launch of the Space Shuttle program, with the mission STS-1 aboard the spacecraft Columbia.
