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Not only keychain pocket watch models but other styles have evolved. Yet, all work thanks to the same kind of discoveries and measurements. As stated by experts "the first calendars back to civilization located in the valley of the Tigris and Euphrates, established through the observation of the moon, giving rise to the calendar based on cycles of 29.5, which was a new moon, thus dividing the year into twelve months, giving a total of 365 days. Hence, it ends up producing the division of the calendar in days, weeks and months. According to experts the "born of the calendar and moon phase is a time measurement system for civilian needs, divided into days, weeks and months." They also state that there are multiple calendars: • Babylon: Calendar with 12 months and 30 days each, which does not coincide with the seasons. This will introduce extra months to coincide with the seasons. • Egyptian: This calendar is based on replacing a lunar calendar based on the sun. They were based on the same distribution as the Babylonian, but added 5 months extra for matching with the seasons. • Greek: It was a calendar with 354 days, but was the first who had a scientific basis and interspersed extra months in specific cycles of solar years. • Roman: Contains 10 months with 304 days in a year starting in March and then added two more months in January and February. But as the months had only 29 or 30 days it was imperative to insert an extra month every two years. But this calendar brought much confusion and the time of Caesar introduced in Julian calendar, in which years consisted of 365 days and a leap year every four years, in 366 days. Our calendar is derived from the Roman calendar. However, it is strictly related to keychain pocket watch accurate precision. It is imperative to analyze its physics and science aspect. Experts claim that a clock is a device used to measure or indicate the passage of time and can be fixed or portable. There is a wide variety of models. To conclude, it is worth mentioning that keychain pocket watch came from ancient and traditional sundials and pendulums. These were one of the first that appeared in the eighteenth century. It is a time measuring instrument based on the situation of a plane of the shadow cast by a score exposed to sunlight. Each sundial was designed for specific latitude. To calculate the official time by sunlight had a draw, as this varies.
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