Historically, the trend of studying astrology was also caused by William.

In 1066 A.D., when William, Duke of Normandy, was preparing to cross the sea to conquer England, the appearance of Halley's Comet coincided with the appearance of Halley's Comet, which is believed to have led Duke William to victory.

William himself was a strong believer in astrology at the time, and when he crossed the sea, he took his court astrologer with him on his expedition to England.

Astrologers at the time divined good fortune for him, and chose Christmas noon in 1066 as the auspicious day for William to be crowned King of England.

At noon on Christmas Day in 1066, it was an extraordinary occasion, and William saw it as a crucial day for England to rebuild its fortune.

Since the establishment of the Norman Dynasty in history, the popular astrology on the European continent has flowed into Britain in large numbers, and astrology researchers can be seen in important cities such as London, York, Oxford, Cambridge, and Wessex.

The prosperity of astrology was inseparable from William's patronage, and some buildings at that time even painted astrological signs and frescoes such as the zodiac.

William, however, was different from his historical predecessors, and although astronomy flourished in England and France under his auspices, he did not like the militaristic astrology that predicted the general trend of the world, but rather admired natural astrology.

With the help of astrologers, William summarized the research results of his predecessors and wrote two astrological works, namely "The Celestial Sphere" and "On the Astrolabe" on constellations.

Most of the credit for the astronomical works "Treatise on the Celestial Spheres" and "On the Astrolabe" should be attributed to the astronomers who worked for him, but they preferred to give it to William, because without William's support, astronomy would not have been able to flourish as it is now.

In the dark Middle Ages, the right to interpret astronomy had always been forbidden by the Catholic Church, and without the protection and funding of a powerful monarch like William, perhaps those astronomers would have been condemned as heretics by the Church and burned at the stake, just like Copernicus, who proposed the heliocentric theory.

Another advantage of studying astronomy in France is that the Normans had the exclusive technology to make telescopes.

Some large astronomical telescopes may not be able to be successfully manufactured, but small telescopes are generally enough to facilitate the study of astronomy.

Not only astronomy, but also natural science studies such as hydrostatics, optics, dynamics, mathematics, etc., were also selflessly funded by William.

However, although William's England and France were more relaxed and tolerant in their attitude towards the natural sciences, professors and scholars from all over Europe still lectured at the Royal Paris University under the "guise of ballistic launches", navigation and other practical mathematical disciplines when they came to lecture at the Royal Paris University.

At that time, people were more willing to believe in their beliefs than reasonable natural sciences, and when natural sciences contradicted their beliefs, they were willing to choose their beliefs, even if natural sciences seemed more reasonable and convincing to them.

This has not changed even more than 600 years later.

Historically, in 1675, Barbey, a professor at the University of Paris, made it clear that although he believed that Copernicus's heliocentric theory was more correct, as a faithful Catholic, he had to reject Copernicus's doctrine.

"Although natural reason cannot convince us, in order to maintain the authority of Scripture we must place Tycho's system before the Copernican system, and our minds must be subordinated to the faith of Christ."

This was the general attitude of scholars at the time, and it was not something that William could change for a while.

Until the 40s of the 17th century, Aristotle's scholasticism still had a monopoly on European thought.

Scholasticism, like the philosophy of religion, is an idealist philosophy, both of which are usually used by the Catholic Church to train clergy, and it serves religious theology by arguing for the Christian faith in an abstract and cumbersome way, and is called scholasticism because the theories it teaches are often completed in the church's scholasticism.

Scholasticism was a school of thought that was used by the Church to strengthen its control over the beliefs of Europeans, and was therefore highly respected by the Church.

As opponents of the papacy, they admired what William opposed, and his support for the natural sciences was in fact an alternative counter-attack to the Church.

William's initiative, which was also supported by the Church of France and the Church of England, especially the Church of France, provided shelter for the flourishing natural science research at this time.

You may wonder why the French Church is working with William and the Holy See.

This is actually about the situation of Christianity in ancient Rome, when the Western Roman Empire collapsed, and there were two major Christian centers in the whole of Europe, one was Rome and the second was Paris.

The Church in Rome grew by gaining the support of the Lombards who believed in Catholicism, and the Church of France in Gaul was practically not inferior to the Church of Rome because of the ecclesiastical institutions of many Roman-era towns that remained at the time.

To sum up the relationship between the Church of Rome and the Church of France at that time, that is, the relationship between brothers and sisters, while the relationship between the Church of Germany, the Church of Spain and the Church of England, which is more like the relationship between parents and children, is more like the relationship between parents and children.

At that time, Germany was still an uncultivated and barren land compared to the developed Gallic France, so the monarchs here had to rely on the ancient Roman cultural heritage of the Roman Church, such as law, literature, and administration, to govern their country.

The Church of England and Spain, for example, was more dependent on the support of the Roman Church.

It was often said at the time that "once the bishop of France wears the hat of a bishop of the Red Machine, he becomes a true patriot, and the bishop of England, once he becomes the Archbishop of Canterbury, follows the pope and opposes his king." ”

Although the French Church is called the eldest son of Christianity by the Pope, it does not want to be subordinate to the Holy See, but at least to retain the second place of Christianity, so that the French Church will have to rely on the secular power of the French king.

Although William's side disposed of the Archbishop of Reims who opposed him and brought the French Church under his control, it did not harm the fundamental interests of the French Church, and the Bishops of France were never willing to submit to the Holy See, so they preferred William, who ruled France, to cooperate.