That’s a tough question to answer. A number of devices have been invented and used by mankind for thousands of years to measure and keep track of time. The sexagesimal system of time currently being used dates back to 2000BC.  The Egyptians developed water clocks and divided the day into two 12-hour periods using large obelisks to track the time along the movement of the sun. A few many timekeeping devices that were invented in ancient times includes, candle clock used in Ancient China, Japan, England and Mesopotamia; Timestick was used in India, Tibet and Persia and a few countries in Europe; Hourglass ; Sundial, which worked on shadows to provide local solar times on sunny days. The earliest clock with a water-powered escapement mechanism used rotational energy to convert into intermittent motions. Its use dates back to 3^rd Century BC in Greece. The mercury powered escapement mechanisms were used in the 10^th century by Chinese engineers. Iranian engineers on the other hand in 11^th Century invented water clocks driven by gears and weights. That’s a tough question to answer. A number of devices have been invented and used by mankind for thousands of years to measure and keep track of time. The sexagesimal system of time currently being used dates back to 2000BC.  The Egyptians developed water clocks and divided the day into two 12-hour periods using large obelisks to track the time along the movement of the sun. A few many timekeeping devices that were invented in ancient times includes, candle clock used in Ancient China, Japan, England and Mesopotamia; Timestick was used in India, Tibet and Persia and a few countries in Europe; Hourglass ; Sundial, which worked on shadows to provide local solar times on sunny days. The earliest clock with a water-powered escapement mechanism used rotational energy to convert into intermittent motions. Its use dates back to 3^rd Century BC in Greece. The mercury powered escapement mechanisms were used in the 10^th century by Chinese engineers. Iranian engineers on the other hand in 11^th Century invented water clocks driven by gears and weights.

That’s a tough question to answer. A number of devices have been invented and used by mankind for thousands of years to measure and keep track of time. The sexagesimal system of time currently being used dates back to 2000BC.  The Egyptians developed water clocks and divided the day into two 12-hour periods using large obelisks to track the time along the movement of the sun. A few many timekeeping devices that were invented in ancient times includes, candle clock used in Ancient China, Japan, England and Mesopotamia; Timestick was used in India, Tibet and Persia and a few countries in Europe; Hourglass ; Sundial, which worked on shadows to provide local solar times on sunny days. The earliest clock with a water-powered escapement mechanism used rotational energy to convert into intermittent motions. Its use dates back to 3^rd Century BC in Greece. The mercury powered escapement mechanisms were used in the 10^th century by Chinese engineers. Iranian engineers on the other hand in 11^th Century invented water clocks driven by gears and weights. That’s a tough question to answer. A number of devices have been invented and used by mankind for thousands of years to measure and keep track of time. The sexagesimal system of time currently being used dates back to 2000BC.  The Egyptians developed water clocks and divided the day into two 12-hour periods using large obelisks to track the time along the movement of the sun. A few many timekeeping devices that were invented in ancient times includes, candle clock used in Ancient China, Japan, England and Mesopotamia; Timestick was used in India, Tibet and Persia and a few countries in Europe; Hourglass ; Sundial, which worked on shadows to provide local solar times on sunny days. The earliest clock with a water-powered escapement mechanism used rotational energy to convert into intermittent motions. Its use dates back to 3^rd Century BC in Greece. The mercury powered escapement mechanisms were used in the 10^th century by Chinese engineers. Iranian engineers on the other hand in 11^th Century invented water clocks driven by gears and weights.

                        That’s a tough question to answer. A number of devices have been invented and used by mankind for thousands of years to measure and keep track of time. The sexagesimal system of time currently being used dates back to 2000BC.  The Egyptians developed water clocks and divided the day into two 12-hour periods using large obelisks to track the time along the movement of the sun. A few many timekeeping devices that were invented in ancient times includes, candle clock used in Ancient China, Japan, England and Mesopotamia; Timestick was used in India, Tibet and Persia and a few countries in Europe; Hourglass ; Sundial, which worked on shadows to provide local solar times on sunny days. The earliest clock with a water-powered escapement mechanism used rotational energy to convert into intermittent motions. Its use dates back to 3^rd Century BC in Greece. The mercury powered escapement mechanisms were used in the 10^th century by Chinese engineers. Iranian engineers on the other hand in 11^th Century invented water clocks driven by gears and weights. That’s a tough question to answer. A number of devices have been invented and used by mankind for thousands of years to measure and keep track of time. The sexagesimal system of time currently being used dates back to 2000BC.  The Egyptians developed water clocks and divided the day into two 12-hour periods using large obelisks to track the time along the movement of the sun. A few many timekeeping devices that were invented in ancient times includes, candle clock used in Ancient China, Japan, England and Mesopotamia; Timestick was used in India, Tibet and Persia and a few countries in Europe; Hourglass ; Sundial, which worked on shadows to provide local solar times on sunny days. The earliest clock with a water-powered escapement mechanism used rotational energy to convert into intermittent motions. Its use dates back to 3^rd Century BC in Greece. The mercury powered escapement mechanisms were used in the 10^th century by Chinese engineers. Iranian engineers on the other hand in 11^th Century invented water clocks driven by gears and weights.