The 24-hour clock and the ordinary clock time corresponds to the chart and the conversion method

The 24-hour timekeeping method is from 12 o'clock at night (0 o'clock) to 12 o'clock at noon, the hour hand walks a circle is 12 hours; from 12 o'clock at noon (0 o'clock) the hour hand walks a circle is also 12 hours, a **** 24 hours, that is, a day = 24 hours, this timekeeping method is called 24-hour timekeeping method.

Ordinary timekeeping is generally used "early morning", "morning", "morning", etc. to describe the day from 0:00 to 12:00 noon, the moment of time. The time period is described by "afternoon", "evening", "night", etc. to describe the day from 12:00 noon to 12:00 pm, the time period.

Timing Methods:

The Spring and Autumn Period had already used timepieces such as the Gui Watch~Leak Scale to make a more accurate division and record of the time of the day.

Guiwu, or sundial, has a sundial needle disk composition. Sundial needle inserted in the center of the plate, the sundial plate is engraved to indicate the division of time. The shadow of the needle from the sun is projected on the divisions of the sundial plate, which indicates the time.

The rainy day and night with a leaky carving. Funnel carving, also known as the funnel pot, including a small hole in the bottom of the copper pot and with the scale of the carve arrow two parts. The water flowed down at a constant speed, and the moment could be determined by observing the change of water level through the scale.

Tang Dynasty, a line of monks invented the earliest self-tuning bell, with the leakage of water to stimulate the wheel, a day and a night to turn a week, 29 turns more than a month 365 turns for a year. At the same time equipped with 2 wooden people, every moment a drum, an hour (equivalent to a 2 hours) a bell. Yuan dynasty Guo Shoujing had also invented a different sound mechanical chime. Folk use more incense, candles and other timekeeping methods.

Modern mechanical clocks, electronic clocks, quartz clocks and other clocks are imported from the West.