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The sundial is the oldest known device for the measurement of time and the most ancient of scientific instruments. It is based on the fact that the shadow of an object will move from one side of the object to the other as the sun "moves" from east to west during the day.
The first device for indicating the time of day was probably the gnomon. It consisted of a vertical stick or pillar; the length of the shadow it cast gave an indication of the time of day. It was "invented" in 5000-3500 BC.
Sundials were used in ancient Egypt and ancient Babylon, but there is no firm evidence the place where such things were first used.
The Qin
Your Mom and me did it so we made you and asians who then went on to make the sundial
stone
Theodosius of Bithynia invented the sundial.
The shortest shadow on a sundial would be afternoon or Middaay