It wasn't discovered it was invented in Alexandria.
Margaret W. Mayall and Annie Cannon discovered the Hourglass Nebula while compiling the Draper Catalog in the early 1900's. Improved technology led to Raghvendra Sahai and John Trauger identifying the actual hourglass shape in 1996.
The hourglass dolphin is called an hourglass dolphin because its black and white markings resemble an hourglass!
An hourglass was used as a timer, with the size of the hourglass determining the length of time it measured.
How many seconds are in a hourglass
glass+sand=hourglass
glass+sand=hourglass
phantom hourglass is released in 2007.
sand + glass = hourglass
you get the little ball thing tap on the hourglass and draw a hourglass
People in the beginning used the stars, and the seasons to keep track of time. So there is no one person that discovered time. The first time devices were the sundial, hourglass, and the water clock. In the 1300's is when the first mechanical clock was invented.
glass+sand=hourglass
Hourglass triplefin was created in 1876.