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You can easily understand how to develop a watch. You can start with a basic sundial. This model lead to a pocket watch. You can get in touch with your ability to perform construction. Consider learning by construction. Types of time measurement You might want to try to differentiate the various types of measurements of time. An example is the beloved pocket watch. The time is a dimension created to measure the interval in which case an ordered series of events. Various historical documents and artifacts show that all cultures have been concerned with measuring and recording the passage of time. The sun, moon and stars have provided a reference for measurement. Ancient civilizations relied on the apparent motion of these celestial bodies to determine seasons, months and years. The Mayan and Central America people, whose culture flourished between 2000 and 1500 BC, relied on the Sun, Moon and Venus elusive to establish schedules of 260 and 365 days, which later were an important part in the large stones of the Aztec calendar. Modern Western civilization in 1582 adopted the Gregorian calendar. Solar has 365 days, but not the fraction of 0.2425 days needed to complete one year. To avoid gaps, uses the leap year every four years. Thus, every pocket watch is accurate due to physics and astronomy matters. Since time immemorial, have been known to the changing shadow of an object indicates the time of day, as it shortens around noon and extends into the sunset. Initially, the day was divided into 12 parts or hours. Of course, these varied in length, being longer in summer and shorter in winter, especially in regions such as the British Isles. In the thirteenth century, the Arab Abul-Hassan introduced the idea of making all hours of the same length and up to the fifteenth century was adopted for general use. The time is the twenty-fourth part of a day and includes 60 minutes or 3.600 seconds. When the time was tied to Earth's rotation period, the second was defined as 1 / 86, meant a solar day. However, the rotation of the Earth is not uniform. Gravitational interactions with the Sun and Moon, atmospheric disturbances, ocean currents and other phenomena cause significant variations. The first pocket watch was built in France. In 1840, we established the time of the Greenwich Royal Observatory in England, Scotland and Wales, replacing local systems. Then there was the reference for the world time. Note that high-precision times are UTC certain reconciling the differences between various atomic clocks in over 25 countries, supervised by the International Bureau of Weights and Measures, based in Paris, France. The Earth's rotation period was much shorter in its infancy and will become longer. The speed is reduced imperceptibly, but steadily. The day has become longer, about 1.7 milliseconds every century.
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