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发表于2024-11-11
On Time pdf epub mobi txt 电子书 下载 2024
Award-winning science writer Gloria Skurzynski takes young readers on a fascinating tour through the history of time measurement. She shows how humans learned to recognize time and measure it in smaller and smaller units from Stonehenge, which marked the equinoxes; to Egyptian obelisks, which measured the hours; to modern-day atomic clocks, which split seconds into minuscule fractions.
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On Time pdf epub mobi txt 电子书 下载 2024