With the Huaiguo Office making the Zhuzi Ceremony, the scholars of various schools were rejoicing. Many people came to the Huaiguo Palace with their books.

But anyone with some vision knows that as long as he is selected into the 100 schools of thought this time, his books are included in them, and he will be famous for eternity, how can he miss such an opportunity.

At the same time, the Bangzhou states also received the news that the Huai State was going to repair the hundred classics of the princes, and as the kings, they quickly thought of the benefits of this matter, which could greatly improve the status of the Huai State and help the Huai State obtain the status of orthodoxy.

They were very reluctant in their hearts, but the Huai State was strong, and the countries did not dare to oppose it at all. And what surprised them even more was that the original scholars in the country rushed to Huai State.

In Zhuxia, there are many people who are academic, but there are not many who can be famous all over the world, and except for those who have made great achievements, others only have some fables and allusions, and there are few records in the official history.

Now there is Huai Guo who has come forward to record the hundred schools of thought, which will not be missed if you want to leave your name in history and want to make your doctrine popular in the world.

There are many schools of thought, which are all-encompassing, and Huai Guo came forward to compile them, giving these people the opportunity to write books and pass them on.

Huai mobilized a large number of manpower and material resources to begin to compile the doctrine of the hundred schools of thought.

At the same time, after developing in the Huai Kingdom for a while, the Mohists began to study astronomy. Huaiguo has a vast territory, from north to south, thousands of miles, and the climate varies greatly from place to place. Growing a variety of food crops is also very different, and even the time of year is different.

For an agricultural country, food is crucial, so you must be careful when to plant and what crops to plant.

At first, there was only one area in the Huai River Basin, and there was little difference in the cultivation of grain here, but later it seized the land of Wuyue and the land of Jingchu, and the climate and environment changed greatly.

Therefore, there is a need for more accurate cultivation times, as well as food cultivation techniques. At this time, Huai Guo brought the scholars of the Mo family and the peasant family to prepare to compile a calendar.

How important is the calendar? It is closely related to agriculture, represents the foundation of the country, and influences the course of the entire history.

From ancient times to the present, human beings like to look up at the starry sky, and the sun and the moon are also the two closest to human beings and have the greatest influence.

And from ancient times to the present, human beings have worshiped the sun and the moon. Deify the sun and moon. And given a special meaning.

The advent of the calendar was first summarized according to the changes in the position and shape of the sun and moon.

Ancient ancestors discovered that the position of the sun had a huge impact on the change in temperature. The appearance of the four seasons of the year is closely related to the position of the sun.

So people recorded the changes in the four seasons of the year, the alternation of day and night.

The four seasons change throughout the year, the sun is far away, the shadows of the stone pillars on the ground are longer, and winter is coming. The distance of the sun is nearer, and the shadow of the stone pillars on the ground is shorter, and it is summer. After winter, everything is full of vitality and vitality, this is spring, the grass and trees are sluggish, the fruits are ripe, and the crops are abundant, this is autumn.

At the beginning of the year, the sages recorded the time of the four seasons of the sun, and each time the four seasons of the sun changed to complete a round, this is called a 'year'.

So mankind has the concept of years.

The change of the moon is more obvious, and the moon is cloudy and sunny. The moon starts from the crescent moon at the beginning, then grows little by little, becomes a crescent moon, a half moon, and finally becomes a full moon, and this pattern is also repeated. In ancient times, the ancestors recorded this law and called it 'moon'.

As a result, the earliest calendars, the solar calendar and the lunar calendar, appeared.

But the people who just came out didn't know what that meant.

When mankind entered the age of agriculture, the role of the calendar appeared. Cultivation, the cultivation of grain requires accurate time, once the time is not accurate, a few days earlier or a few days late, will affect the harvest of grain.

So for the first time, the rulers began to calibrate the calendar to find the most accurate day to cultivate.

Later, in order to establish their own legitimacy, rulers began to emphasize the 'first month'.

Since the beginning of the Xia Dynasty, the Xia Dynasty has revised its own calendar to confirm its own New Year's Month. After Yin Shang defeated the Xia Dynasty and established it, he also established his own calendar to confirm his first lunar month.

However, due to the limited knowledge of these calendars at that time, the calendars established were not accurate, there were many errors and omissions, and more importantly, after hundreds of years, the errors of the calendars have reached an unbearable level.

After King Wu conquered Shang, Bang Zhou also established his own calendar, but this set of calendars also faced the problem of inaccuracy. The Huai Kingdom originally used the Bang Zhou calendar, but after the Huai State continued to grow, the errors and omissions of the Bang Zhou calendar became bigger and bigger.

Therefore, the calendar had been recalibrated as early as the time of Huaiwen Xianggong, but this set of calendars was only a correction based on the Zhou Dynasty calendar. Now that the Huai State has occupied the Chu State, two thousand miles away, Wang Pu is ready to revise his calendar.

Like the revision of the Hundred Schools of Thought, the revision of the calendar was also to determine the orthodoxy of the Huai Kingdom.

The lunar calendar and the solar calendar are closely related, but there are several days between them, which can cause the seasons of the first month to change.

The beginning of the year must be in the spring, and the harvest must be in the fall.

Errors in the solar calendar can lead to errors in farming, and in an agrarian society, there is nothing more important than gravity.

Huaiguo originally had a stargazing platform, and Wang Pu ordered the Huaiguo clan personnel to study the celestial phenomena together with the disciples of the Mo family and the peasant family, and then determine the agricultural time according to the changes in time over the years, the cultivation time, and the harvest time.

The position of the sun, moon and stars is used to calculate an accurate calendar. This project requires a lot of time, but fortunately, the Mo family and the peasant family have also conducted detailed research on time, climate, and astronomy, which is good news for Huaiguo.

According to the suggestions of the people, Wang Pu began to set up stargazing platforms in various parts of Huaiguo, so that people from all over the country could study the celestial phenomena and then summarize and calculate.

It takes a lot of time to study the celestial phenomena and compile the calendar. At the same time, Huaiguo found that the time of climate change and the time of cultivation were also different in different places, so the positions of the sun and stars in different places were observed and recorded at the same time.

A large amount of data is aggregated and calculated, and the whole process becomes extremely complex. Even when studying these astronomys, the best astronomers and mathematicians in Huai discovered a problem that made people stunned. They found that the altitude of the star changes from north to south.

The further south, the lower the North Star, and the further north, the higher the North Star, which led them to the conclusion that the earth was round.

——

In the history of the development of science in ancient times, the development of astronomy is also amazing, and the accuracy of the calendar in ancient China is breathtaking, among which the achievements of the ancient Huai Kingdom have made the world look sideways.

The birth of the Huaiwang calendar is epoch-making, it is the world's first calendar that combines the Gregorian calendar and the lunar calendar, and the world's second calendar that combines the Gregorian calendar and the lunar calendar actually appeared more than 1,500 years later.

And the error of this calendar is surprisingly small, thanks to Wang's adjustment of this calendar, we still use this calendar more than 2,000 years ago.

What's even more incredible is that as early as more than 2,000 years ago, ancient China discovered that the earth was round. It's all unbelievable, but when you think of the country he was born into, and the family that is full of legends and even myths, it all seems to make sense. ——History of Ancient Astronomy

(End of chapter)