Ciro Santilli
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中国独裁统治 China Dictatorship 新疆改造中心、六四事件、法轮功、郝海东、709大抓捕、2015巴拿马文件 邓家贵、低端人口、西藏骚乱
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Time
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⇓ toc
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Wikipedia
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Table of contents
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1. Frequency
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1.1. Period (physics)
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1.2. Hertz (1857-1894, Hz)
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1.2.1. Megahertz (MHz)
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2. Clock
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2.1. Quartz clock
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2.2. Atomic clock
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2.2.1. Caesium standard (1967)
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3. Unit of time
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3.1. Second (s)
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3.2. Day (d)
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3.2.1. Calendar
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3.3. Year (y)
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Ancestors
International System of Units
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768
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System of units
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768
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Physics
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Natural science
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Science
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Ciro Santilli's Homepage
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Incoming links
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