The sundial is an instrument used since ancient times to measure over time. It is known also as sundial . Uses the shadow cast by a gnomon or stilo on a surface with a scale to indicate the position of the Sun in the diurnal motion. 
responsible for developing science theories and gather knowledge about sundials is called gnomonic . The Sumerians were the first to divide the year into 12 units, but the division of day into 24 hours, and the year in 365 days, we owe to the ancient Egyptians. The orientation of the pyramids were made with reference to the movement of the stars and the ziggurats of the Mesopotamians were constructions staggered where they could see the hours by counting the steps.
civilizations in ancient buildings were erected with a clear intention to measure and time management. 
In this photo of the Iberian Illeta Campello (Alicante) V century before C found a quadrangular building dedicated to worship. Its diagonal mark clearly the four cardinal points, which can make us think that it was known at this time the shadowplay that made the building and may be used to calculate and time management.
In this photo of the Iberian Illeta Campello (Alicante) V century before C found a quadrangular building dedicated to worship. Its diagonal mark clearly the four cardinal points, which can make us think that it was known at this time the shadowplay that made the building and may be used to calculate and time management. The remains of the activity by the inhabitants of this region speak of a society with a cultural and productive well-structured, with activity in the three sectors of production. This leads to the assumption that the need to organize time so thorough was a priority.
Greeks and Romans also used sundials. Pliny the Elder in his Natural History tells the story of the clock was built by Emperor Augustus in the Campus Martius taking advantage of an Egyptian obelisk. To know the history of this impressive sundial click the link above or below there.
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