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Outside the camp.

The sun is falling, Wang Erniu, Tie Jian Jun, Ha Laocai, Jia Daoshi, and Yang Milk Wa saw off Lord Lidel.

The purpose of Sun Yi's trip was to explore other possible settlements, and the destination was the Shennong River, which was located twenty or thirty miles north of the Red Willow Forest.

It is said that this kind of miscellaneous matter does not need to be personally involved in the battle, but this time he will also test several kinds of military equipment newly developed by Sun Yi.

Sun Yi himself also wanted to participate in what the march of this era was like.

Accompanying Sun Yi out were a team of soldiers led by Yang Liu, two auxiliary soldiers drawn from various production teams, five robe brothers led by a dragon, and stuffy eggs and four orphans.

The lineup can already be said to be more luxurious.

Unexpectedly, as soon as the team assembled, infighting began.

The reason is that Yang Liu's team has unfurled a flag.

It is a small triangular flag, with blue edges on a red background, and a cluster of ponytails tied to the top of the flagpole, which swings in the morning breeze like a bunch of Buddha dust.

In the center of the pennant is a pentagram cut out of cloth, and inside the pentagram is a black and white yin-yang fish.

As soon as Yilong and Wang Erniu saw the flag, they immediately quit!

Plagiarism! This is blatant plagiarism!

The pentagram was painted by the master to the wolf mountain robe brother, and the yin and yang fish was painted by the master to the Shennong altar, Yang Liu, what does it mean that you kid sew the two together on the flag?

Yang Liu didn't mean to give in at all, Xiao Qi deliberately waved it, and said: "This is called mutual assistance from within, and the outward edge will be exposed, which is the mission of our soldiers!" The Taiji diagram and pentagram drawn by the master, why can't I use it when I wait! The guise that your robe brother hung out is so big, you can catch up with the flag, didn't we say anything! ”

Wang Erniu immediately supported a dragon, "Your banner, not embroidered with fierce beasts, sewn on the two rituals of our mutual assistance, can it still be called a battle flag?" ”

According to the rules of the Ming Dynasty, only the army can use the flag. The curtains made of cloth are called banners, and the signs made of wood are called signboards.

The flag has been used exclusively in the army since ancient times. The pole is a flag on the side, and the horsetail, feathers or streamers on the top of the flagpole are the flag. The shape of the flag is mostly triangular, vertical rectangle or square, like the national flag of later generations of horizontal large rectangle called "flag". The pattern of the flag is often a fierce beast such as a bear and a tiger

Seeing that he hadn't set off yet, he made a mess of these little things, and Sun Yi hurriedly came out and made a mess.

Sun Yi snatched Yang Liu's flag and said: "In this way, this kind of Taiji diagram and pentagram symbol will be used by the headquarters in the future, and the pentagram soldiers can also use it, and the people can also play their own flags." ”

Jia Daoshi hurriedly helped: "This is very good! Everyone's happy! Tai Chi negative yin and embrace yang, is my first picture in China, the pentagram and the five elements are born and restrained, and it is the first of the five stars, the heavenly traces of Venus. ”

Sun Yi took the opportunity to order to set off quickly.

As soon as he left the camp, Sun Yi found that the speed of the march at this time was incomparable to that of later generations.

Brother Pao and the soldiers said that when they encounter small rivers and swamps, just be careful and go straight over. The auxiliaries drove their cattle and camelled supplies, and had to make a detour when they encountered soft mud. The materials on the backs of the cattle include dry food, iron pots, shields and armor, especially tents, and a camp tent requires one livestock, and Sun Yi felt that there was no way to streamline it.

In the area of "Shulinzi Township", it can be said that there are no roads at all, and there are no people who are familiar with the terrain as guides, so it is difficult to walk in and out, no wonder the camp is hidden here when the sun falls.

The sun was almost noon, and the team slowly walked out of the "Forest Township", and the landscape in front of them gradually opened up, Sun Yi hurriedly ordered a dragon to stop the team from advancing.

Each member of the team took out an iron needle and put it in the water with straw sticks or small leaves. The iron needles were dyed red, and the tips of the needles were pointing south.

These iron needles were the first batch of finished products of Niu and Xue, and they were strengthened by Sun Yi with electromagnets to form a guide and a dual-purpose needle for sewing and sent to the team members this time.

It is said that in the Hetao Plain, there is no disorientation at all. At any time, as long as you look up, the towering Wolf Mountain is in the north, the low and neat Shaanba is in the south, and the east is the lonely Yinshan Mouth, and between Yinshan Mountain and Wolf Mountain, there is a large Osaka slope that gradually becomes higher. However, Sun Yi demanded that all soldiers and robes must be able to use a compass and know the local magnetic declination.

The so-called magnetic declination angle is the declination angle between the north and south of the compass and the geographical north and south poles. Since the geomagnetic north and south poles do not coincide with the geographical north and south poles, the magnetic declination angle is different in all parts of the earth. Sun Yi's mobile phone has a map of the magnetic declination of the Hetao area in 2016, but the magnetic poles of the earth are moving slowly every year, and the magnetic declination may be tens of degrees worse in hundreds of years! The excavation of magnetic materials and minerals by human beings in the past few hundred years, especially the mining of Baiyun Obo iron ore 100 kilometers away from the Hetao Plain, will also cause the drift of the unknown magnetic declination.

Similarly, over the past few hundred years, the rivers and landforms have changed so much that the maps in Sun Yi's mobile phone are basically useless. The only ones that can be used as a reference are Wolf Mountain and Yin Mountain.

Sun Yi chose a few obvious peaks, assuming that their height and position had changed negligible over the centuries, and began to survey.

Sun Yi first measured the elevation angle between himself and several peaks.

The "protractor" was made with the help of the baby, which was a thin wooden board, on which a quarter circle was drawn, and the arc was full of scales.

Sun Yi tied a needle to the center of the circle and a right-angled edge of the "protractor", tied a small stone with a string to the needle in the center of the circle, and then erected a wooden plank to make his eyes, the needle on the right-angled side, the needle in the center of the circle, and the mountain peak into a straight line, and then the angle between the perpendicular line of the stone and the other right-angled side is the elevation angle of the peak.

Obtaining these elevation angles, using the height of the mountain peaks in later generations, you can calculate your distance from the peaks.

On a piece of "coordinate paper" that had already indicated the location of these peaks, Sun Yi used a simple compass to quickly determine his current position.

Compared with the administrative map of later generations, it is not bad as Sun Yi expected, he is in the eastern part of the Hetao Plain, somewhere in Wuyuan County in later generations. It is more than 40 kilometers away from the peak where he jumped off the cliff and flew.

Sun Yi was not at ease with a single method to measure Sun Yi, so he collected the horizontal angle between himself and the mountain peaks, used the distance between the peaks in later generations to calculate several sets of results again, and averaged the results to the minimum variance to obtain his own precise position.

Using the location coordinates just made and the electronic compass in Sun Yi's mobile phone, Sun Yi concluded that the local magnetic declination angle was 11 degrees to the east, while the magnetic declination angle of the Hetao Plain in later generations was 4 degrees to the west!

What a sea of vicissitudes!

Sun Yi put away the "measuring instrument" and looked at the time on his mobile phone, and it was already the time of radio contact agreed upon by the collapse of the sky on the same day.