Lead
When we were learning mathematics, the teacher would tell us that there are seven days in the week, twenty-four hours in a day, and that an hour has sixty minutes, and one minute has sixty seconds.
This division is easy to understand for a day, but when did we start using this division?
And after mathematical calculations, there are seven days, twenty-four hours a day, and the result is that there are one hundred and sixty-eight hours in a week, so how many hours will a night pass?
And why do we have to use this number to calculate time?
Is there a division that is the same as time?
Yes, that is, the degree we use to calculate the angle of the circle, also called pi, this number will not only be used in our daily calculations, but also often appear in our lives, so where does this division come from?
It has been used for a long time.
In ancient times, we had already begun to calculate the division of angles, and at that time we had already begun to classify and divide angles.
In ancient times, we used the same way to calculate the angle of a circle as we use today, that is, to divide the angle on a circle into three hundred and sixty angles, such an angle is called one degree, and the whole circle composed of three hundred and sixty angles is called a circumference.
In ancient times, the pi we use is different from the pi we use now, that is, in the fourth century B.C., there was a mathematician in ancient Greece, he was called Nicosed, he was highly accomplished in mathematics, and his knowledge spanned many fields such as physics and mathematics.
At that time, Nicosed derived pi from a new method of calculation, and the data derived from this derivation was much more accurate.
This value was in the fourth century B.C., with the value of 36 angles and 360 degrees, and all this is because he used a method of calculating the hexagesim system, and for the convenience of memory at that time, Nicosed deduced the same value as the number of degrees used at that time, so the same data was used.
This value was also a common way of using it in ancient Greece, and there was also a mathematician in ancient Greece at that time to verify this value, and the result of his calculation was that this value was 34.28, and this means that this value is an approximate value, not an exact value.
This value of 34.28 is approximately calculated, and our later mathematician did an accurate numerical calculation of this value, and he found that this value is 3.1418, and there is actually some difference between such a value and Nicosed's value, although there is a difference.
But the derivation of this value is also correct, and it has been proven correct in later times.
It was not until the 10th century that Galileo Galilei proved that Nicosed's calculation was correct, so this value was also confirmed to be accurate, so this value was later preserved, until now, the angle calculation method we use is the value of 360 degrees.
And this value is also called pi, which is why we must use 360 degrees to calculate.
The way of division is exquisite.
In the early ancient period of the continent, when we divided the angles, we were divided by the wind, and at that time, the strength of the wind was also divided, so we began to divide the degree according to the strength of the wind, and also corresponded to some directions.
In ancient times, the continent was also divided into 360 directions, such as southeast, northwest, and northwest, and these directions were divided according to the direction of the wind.
At that time, the ancients also discovered an interesting phenomenon, that is, the rivers in the north of the continent all flow to the south, and the rivers in the south of the continent all flow to the north, and at the same time, the rivers in some places flow to the east or west.
So the ministers made a proposal to the emperor that the whole river should be divided into two hundred and ten degrees, and that the northern rivers should occupy an angle of one hundred and twenty degrees, the south should occupy one hundred and twenty degrees, and the east and west should each occupy sixty degrees.
At that time, the ancient kings were also named according to the words of the ministers, and they also had a deep knowledge of astronomy, but also had different opinions, they called each direction a room, and the north was called the Xuanfang, the east was called the green room, the west was called the white room, and the south was called the red room.
For the ancient scholars of the mainland, they knew a total of 32 kinds of winds, and for the wind direction we know today, they also have 16 kinds.
At the same time, when they divide the direction of the wind, they also cooperate according to the stars of the North Dipper and the South Dipper, and the ancient people also pay attention to the division of directions.
The east is called the green house, the west is called the white house, and the green and white in the eyes of the ancients, are cold, and the north has a strong cold current blowing to the south, so it plays a warming role, and at the same time, there will be a relatively high temperature fight, and the south is a waterside area, so it plays a role in cooling.
Similarly, the temperature in the south of Baifang is also the same, so this can also ensure that the temperature of each room is relatively average, which is reflected in today's temperature in Tangshan.
At the same time, in ancient times, people called this division Bagua, and at the same time, the Bagua was also divided into four main directions, and at the same time, these four directions corresponded to some major substances, and these substances are water, fire, earth, and metal, and the ancients placed these substances with a deep meaning.
At the same time, there is a reason for this division, people not only use it in astronomy, but also in daily life, for example, the ancients used this method to judge the time, the ancients divided the east into twelve scales at sunrise, and at the same time divided each hour into twenty-one minutes, each minute is ten minutes.
epilogue
Therefore, this division is derived from life, from human habits, and this division also divides each moment of the day clearly, and the ancients embodied this method in daily life.
At the same time, this has been used in ancient times on the mainland, and at the same time, a circle is divided into 360 degrees according to the angle, which is also the attainment of human mathematics in mathematics.