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second unit of time 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. This led to proposals as early as 1950 to define the second as a fraction of a year. YP - The Real Yellow PagesSM - helps you find the right local businesses to meet your specific needs. Search results are sorted by a combination of factors to give you a set of choices in response to your search criteria. Team Second has been very flexible and unbelievably reactive to our changing needs and strict requirements. From the first days of the project, they became team members more than just an external service provider. Ensure that services booked by customers are indeed available at the time they selected. The hour had been defined by...