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![11 Plus: Key Stage 2 Maths: Measurement: Time, The SI unit for measuring Time is the second, s. 11 P](https://www.iarticlesnet.com/pub/img/site/s_12.jpeg)
11 Plus: Key Stage 2 Maths: Measurement: Time, The SI unit for measuring Time is the second, s. 11 P
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日期:2024-07-05
Measurement: Time The SI unit for measuring Time is the second, s. A second was originally calculated as 1/86400 th of a day, but this was not very accurate as the rotation of the Earth can be irregular. Nowadays, the second is derived from energy levels ...看更多