Humanity has been trying to measure time since ancient times. Before the advent of modern clocks, man tried to orient himself with the help of the sun. The first sundials appeared in Ancient Egypt, their descriptions are also contained in the Bible.
The clocks consist of a rod or plate casting a shadow and a dial on which the shadow falls, showing the true solar time.
The beginning of the solar day is at noon when the sun is at its zenith. This time is local because it is different for different latitudes.
The solar day is not of constant duration. It varies throughout the year because of the elliptical orbit of the Earth around the Sun and the tilt of the Earth's axis relative to the plane of the orbit. This causes the days in March and September to be later, and in July and December to be longer. For this reason, sundials show differences from normal time of up to a quarter of an hour throughout the year. | BGNES
