The earliest timekeeping instrument used by humans was to use the length and direction of the sun to determine the time. The former is called a watch, which is used to measure the time of day, set the seasons, and identify directions. The latter is called the sundial and is used to measure time. Both are collectively referred to as the sun clock.
From 1300 BC to 1027 BC, the Oracle of the Shang Dynasty in China had already used the records of the guilty. In the book "The Book of Songs and the Wind of the Country", "In the setting of the square, it was made in the palace of Chu. The day of the day was made in the Chu chamber...". Accurately record the time of use of the watch as 659 BC.
Sun clocks, such as tables, lose their usefulness on cloudy days or at night. For this reason, people invented time-lapse instruments such as leaking pots and hourglasses, oil lamp clocks, and candle candles.
Because it is easy to freeze the winter water, it has been driven by quicksand. "A History of Astronomy" contains the beginning of the Ming Zhan Xiyuan created "five rounds of hourglass." Later, Zhou Xuexue added quicksand holes to prevent clogging and switched to six wheels. Song Yu (1310~1381) wrote the "Song Scholar Collection" which described the hourglass structure, with the parts size and the number of gear teeth of the reduction gear, and said that the shaft of the fifth round had no teeth and was equipped with a time-measurement observation panel.
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- Western Hourglass History
- Hourglass Influencing Factors
- Hourglass Symbol
- Homemade Simple Hourglass Steps
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- Paperweight Production Materials
- Historical Records Of Paperweight
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