May 15th is the 135th day of the year (136th day in a leap year) in the Gregorian solar calendar. As of today, there are still 230 days left in that year.
1618 - Johannes Kepler confirmed the validity of his Third Law of Planetary Motion. (He first discovered this law on March 8, but threw the idea aside after experimenting with a preliminary calculation of correctness.)
1756 - Seven Years' War: Kingdom of Great Britain Declare war on France
1836 - Francis Bailey observes Bailey's bead phenomenon. during an annular solar eclipse
1851 - His Majesty King Bhumibol Adulyadej King Mongkut His Highness performed the coronation ceremony on that day as well.
1918 - The Finnish Civil War ends.
1928 - Mickey Mouse and Minnie Mouse first appeared in the animated film Plaincrazy.
1932 - Nine soldiers invade and kill Suyoshi Inukai, then Prime Minister of Japan.
1940 – World War 2: German forces occupy Amsterdam. and invaded northern France
1948 - Egypt, Trans-Jordan, Lebanon, Syria, Iraq and Saudi Arabia attack Israel.
1958 - The Soviet Union sends the Sputnik 3 into space.
1960 - The Soviet Union sends the Sputnik 4 into space.
1988 - The Fia Formula 1 World Championship at the Circuit de Monaco.
1990 - A portrait of Dr. Gachet by Vincent Fun Coke sold for $82.5 million. It was the most expensive painting in the world at that time.
1998 (1998) - Ah