Xia Dynasty took 250 meters as the lining, Shang Dynasty took 400 meters as the lining, and Wang Ji was thousands of miles long, with a side length of 400 kilometers. Because Polaris is the north, the kings of Xia, Shang and Zhou dynasties are all diamonds.

Kate Spencer, an Egyptian archaeologist at Cambridge University in England, put forward a new viewpoint, which makes the estimation error of the construction age of Egyptian pyramids only plus or minus 10 year. In the latest issue of Nature (200 1 or 2004 10). When a star named "Kaiyang" on the handle of the Big Dipper and a star named "Kochabu" on the spoon of the Little Dipper are vertically connected into a line, their connection line points to the North Pole. Therefore, Spencer believed that the ancient Egyptians used this astronomical phenomenon to determine the north-south direction. However, due to the periodic deviation of the axis formed by the connection between the north and south poles of the earth, it was not until 2467 BC that the connection between the two stars accurately pointed to the north pole, and there was a deviation before and after, and the farther away from this era, the greater the deviation. According to astronomical theory, the magnitude of the deviation can be calculated. Therefore, according to the deviation of the actual north-south direction of the Egyptian pyramids, the construction age of the Egyptian pyramids can be determined more accurately. According to Spencer's theory, the largest pyramid in Egypt, the Pyramid of Giza, was built 4467 years ago with an error of 10 years.

Therefore, Luoyang in the Western Zhou Dynasty and Luoyang in the Western Han Dynasty are not due north, but each has its own angle. The same is true of the direction of the tomb of Yin Ruins. Judging from the skew and overlap of tombs, 100 1 should be Wuding tomb. 1004 is the tomb of his son Xia Dynasty, and Polaris is in the northeast rather than the north.

According to a paper published in the British magazine Nature on June 16, a female Egyptian scientist at Cambridge University in England said that according to her research, the largest pyramid of khufu in Egypt was built between 2485 and 2474 BC. If this statement is confirmed, many important events in ancient Egyptian history will have a more accurate date. Therefore, this article has attracted great attention from the media. The pyramids are the tombs of ancient Egyptian pharaohs (kings). So far, dozens of pyramids have been found in Egypt, the largest of which is the pyramid of khufu near Cairo. This pyramid is about 14 ... 5 meters high and has a square side 230 meters long at the bottom. The tower is made of more than 2 million large stones. It was built in 20 years by Pharaoh Khufu, the fourth dynasty of ancient Egypt, who used 654.38+million laborers. The exact date of the construction of this pyramid is still unknown, and there are several speculations in archaeology, but the time difference is over 100 years. British Egyptian female scholars were inspired by a magical phenomenon in pyramid of khufu, because the four sides of the square at the bottom of the pyramid basically face east, south, west and north, with only a small deviation. However, the included angle between the straight line of the two stars Ursa major and Ursa minor and the earth axis changes slowly with time, just intersecting vertically in 2467 BC. She believes that the ancient Egyptians with rich astronomical knowledge relied on the positions of these two stars to determine the direction of the four sides at the bottom of the pyramid; The reason why the directions of these four sides deviate slightly is because the angle between the two stars and the earth axis is not really 90 degrees. According to this deviation, female scholars calculated that the pyramids were built between 2485 and 2474 before 2467 BC. Some Egyptian antiquarians believe that the above reasoning is reasonable. Because historical records show that the ancient Egyptians did have a wealth of astronomical knowledge, they have been able to set the number of days in a year as 365 days. Of course, some Egyptian antiquities scholars do not agree with this, because the ancient Egyptians knew how to use astronomical phenomena many years before building the pyramids, so they could not determine the construction age of the pyramids themselves through the astronomical knowledge embodied in the pyramid architecture.