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This figure is sometimes rounded to 3 x 108 m, or 300,000 kilometers . This is easy to derive from the fact that there are 60 seconds in a minute, 60 minutes in an hour and 24 hours in a mean solar day. Until modern times, degrees and hours were divided successively by 60 in pars minuta prima, pars minuta secunda, pars minuta tertia and so on. This evolved to the modern minute and second, but for smaller divisions we follow now the decimal division. In some languages, dictionaries still keep the word for third for 1/60 of a second, for example Polish and Arabic (ثالثة).

The duration of 9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium-133 atom.The ground state is defined at zero magnetic field. The factor of 60 comes from the Babylonians who used a sexagesimal (base-60) numeral system. However, the Babylonians did not subdivide their time units sexagesimally .

Sometimes in role-playing games a second is used to refer to a small period of time or a single turn of combat. It is used as a standard moment of time, and does not necessarily refer to a real second, and could be shorter or longer depending on the scenario. The road to success of a winning marketplace is to go with the right business model. Identifying how to pick the right model to generate revenues can be tricky because of all the possibilities in the market. Find out the business model that fits your growth strategy and have a look into some successful marketplaces’ examples.

The hour had been defined by the ancient Egyptians as either 1/12 of daytime or 1/12 of nighttime, hence both varied with the seasons. Greek astronomers, for example Hipparchus and Ptolemy, defined the hour as 1/24 of a mean solar day. Sexagesimally subdividing this mean solar hour made the second 1/86,400 of a mean solar day. This current definition was adopted in 1967 when it became feasible to define the second based on fundamental properties of nature with caesium clocks. Because the speed of Earth's rotation varies and is slowing ever so slightly, a leap second is added at irregular intervals to civil time to keep clocks in sync with Earth's rotation.

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Nevertheless, with the development of pendulum clocks keeping mean time , the second became measurable. The seconds pendulum was proposed as a unit of length as early as 1660 by the Royal Society of London. The duration of a beat or half period of a pendulum one metre in length on the Earth's surface is approximately one second.

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