Chronology is the study of the passage of time. Time itself is a concept difficult to understand and that only since the advent of Einstein is that we have begun to understand exactly what it means. Instead of being constant throughout the universe, time is relative which means that it can vary to different observers according to speed and location. For the purposes of chronology time is no more than the distance between two events but as we all live in the same environment that changes very rarely, although outside the Earth’s gravity time runs a little faster which should be taken into account when it’s navigation by satellite, but this more later. The timeline started in time similar to the human development of civilization. It was due to agriculture, religion and other factors of civilization we know that time became important at the beginning of humanity.
Indicate the time in the old world methods ranged from sundials and water clocks to elaborate structures like Stonehenge, that could predict solstices. It was understood principles in chronology that cycles of the Earth, the Moon and the Sun could all be used as a way to tell you at the time it seemed that the Celestial movements were precise. It was not until the middle ages that humanity developed technology that could accurately measure time. Mechanical clocks used a gear and a leak of foliot were the first clocks of this type and these became even more accurate when the pendulum was added. Mechanical watches intended first for people could make their lives work in sync, attend meetings or festivals at the same time. The next major step came with the chronology in the development of the electronic clocks. These worked running an electric charge through a glass (as quartz) and the use of vibration (or resonance) as a measure of time.