To recap, time is the interval between two sequential moments, one of which is the beginning and the other the end. The connection between the beginning and the end is transchrony. Transchrony is the principle or the ability to connect the start and end of an interval. Transchrony can be objective (within the intervals) or subjective. Time is measured using periodic phenomena. These phenomena always repeat with the same period. The first measurements of time took into account the movements of the Earth and the Moon. Then the first clocks appeared: sundials, water clocks, and hourglasses. In the Middle Ages, mechanical and pendulum clocks emerged. In the 20th century, quartz and atomic clocks appeared.
Elvis Sibilia. Florida. United States
