What is the relationship between people's daily living time in one day and the earth's rotation? Is it the accurate time for the earth to rotate for one cycle

The essence of the problem is the difference between sun day and star day. The rotation of the earth produces the alternation of day and night. People work at sunrise and rest at sunset. The rising and setting of the sun is our daily time standard. For example, the highest time of the sun in a day is called 12 o'clock. There are 24 hours in the whole day, which is called "sun day"

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11. The contradiction between the definition of time length and the rotation of celestial bodies The earth's rotation cycle is 24 hours, 24 hours = 86400 seconds, but the original definition of seconds is definitely not according to 1 / 86400 of the time required for the earth's rotation cycle, so there must be errors. According to this, the error is a little every day. It can be imagined that 12 o'clock is just the time when the sun rises! I want to know how to adjust this problem What's more, a year is 365 days now, and a cycle of the earth's revolution can't be a whole day, right? There must be a small change. Even if it is adjusted by four years plus one day, it will be adjusted according to the whole day. What about the remaining small change? You can imagine that in January, the northern hemisphere is summer! The answers on the second floor and the fifth floor are not satisfactory. The others are not so good. I know it's adjusted by leap year, but it's also adjusted by the whole day. Have you seen it all day? But the error is not 1 / 4 of the whole day. What about the rest? The second floor let me know that Beijing time is set artificially. I understand that every other time, not only Beijing time (because world time should be unified), but also time zones around the world should be adjusted.
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