1- In reality we find events with variable or irregular rhythm, such as the current of a river, the flight of birds or listen to a song.
2- Mathematical time is a uniform and periodic rhythm, and is taken as a reference to measure the events duration. Clocks are an example of mathematical time. Clocks and calendars are based on periodic phenomena, such as the movements of the Earth.
3- Relative time is affected by speed or gravity. According to the Theory of relativity, in a ship traveling at a speed close to c, time dilates in relation to an observer who remains on Earth.
4- In psychological time each person has a different idea of the events duration. Psychological time is influenced by people's emotions and beliefs. It is the subjective time.
Elvis Sibilia
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