What is star clocks?

Star clocks are clocks that use the positions of stars to keep time. They were used by ancient civilizations, such as the Egyptians and Greeks, to measure the passing of hours, days, and years.

A star clock works by measuring the movement of stars across the sky. The stars appear to move across the sky because of the rotation of the Earth. By observing the positions of stars at particular times of the year, ancient astronomers were able to create a calendar that could predict the timing of the solstices and equinoxes.

Star clocks were typically made up of a circular clock face with markings indicating hours, days, and months. The clock face would have a stationary arrow pointing to the north star, and the observer would use this arrow to create a reference point for measuring the movement of other stars.

Today, star clocks are still used in some observatories to track the positions of stars. However, modern technology has largely replaced the need for star clocks in everyday life.