July 28

1858 – For the first time, fingerprints were used as a means of identification.
1867 – Astronomer Charles Dillon Perrine is born. He is the credited as discovering the sixth and seventh moons of Jupiter.
1914 – In the culmination of the "July Crisis," Austria-Hungary declares war on Serbia, igniting World War I.
1919 – The International Astronomical Union is founded in Paris, France.