After dinner, Chen Huaixiu invited the girls to come out to see the stars together.

Although even in this era, even in big cities, there was no heavy light pollution, and girls were accustomed to the stars in the sky. However, the bright starry light shone on the sea, emitting boundless silver waves. This gorgeous and magnificent scene was the only one they saw in their lives.

In March, the night wind on the sea was just a little cool, and finally there was no need to worry about getting sunburned. Several girls wrapped in cloaks and enjoyed the beautiful scenery of the sea and sky on the deck while laughing and talking about their own words.

Even the eldest princess, who had not appeared after boarding the boat, came out of the cabin and leaned lazily on the lounge chair. While savoring the wine, she looked at the stars in the sky and blinked, just like Zhao Lang's big eyes.

It's the third day of separation, I miss him.

Zhao Hao is a smart person and knows that it is not a good idea to go to the girls or talk to the godmother at this time.

He would rather ask Zheng Ruozeng for advice on how to use the Star Board.

Seeing them on the top deck, holding wooden boards and making gestures, Zhang Xiaojing felt very itchy. But she kept pestering Zhao Hao in the afternoon, so how could she have the nerve to get in?

She had no choice but to withdraw her envious gaze and continue the girls' topic.

Xiao Zhuzi's eyes were looked at by Ma Xianglan beside him. Secretary Ma smiled in his heart. Just as he left Jiangnan, Miss Zhang's thoughts became alive again.

Sister Ma has been cheering her up for a while, but Xiao Zhuzi did not give up. Finally adjusted her strategy and ushered in a turning point.

In the eyes of the scheming sister Ma, the Romance of the Three Kingdoms is naturally longer than the struggle between Chu and Han. If you work harder and get the Seven Heroes of the Warring States Period, then you should not have a good life.

However, you have to consider the young master's ability to withstand it. It is enough to reduce it and create the Five Hegemons of the Spring and Autumn Period.

As for her, she naturally will never fight for hegemony and protect the country without harm.

~~

"Ah, Ah, Ah..." On the top deck, Mr. Zhao sneezed several times, and Gao Wu quickly put on his cloak.

Zheng Yiluan also put on a cloak on his father.

"It's not a big deal." Zheng Ruozeng waved his hand and told him not to disturb him. Then he continued to demonstrate to Zhao Hao the usage of "star-pulling board".

A set of star-pulling boards is composed of twelve square ebony boards, the largest piece has a length of about 24 cm, which is called the "twelve fingers". Each piece decreases by two centimeters to the smallest piece with a length of two centimeters, which is called the "one finger". The center of the wooden board is worn with a rope about 72 cm long, which is very simple to make. Zheng He used it to measure the height of the star and measure the direction.

Although this thing is not good-looking, there are very few people who can be used in the Ming Dynasty. Before, Zhao Hao asked Uncle Mi and Elder Niu and Ma before, and all three of them knew about the existence of this thing. But it is useless to have the star-scaling board, and it also needs to be used in conjunction with the star-scaling map. None of them has seen the star-scaling map, so naturally they will not know the star-scaling technique.

Zheng Ruozeng was also in Hu Zongxian's shogunate, and took the need for naval battles to fight against the Japanese, so he found several star maps from the Gaigut warehouse of the Southern War, including the route for the shipping of grain in the Yuan Dynasty.

It was precisely because of these star-leading maps that he drove his boats across the seas of the Ming Dynasty and wrote the immortal thirteen volumes of "Chuhai Chart" that have lasted forever.

~~

"The art of star-shaping is actually very simple." Zheng Ruozeng said, looking up at the starry sky in the north, and then picked up the "six-finger" board with his right hand and straightened his right arm.

Then, with your left hand, you will pick up the string worn in the center of the wooden board and put it in front of you.

"First look at the lower edge of the board, set the lower edge to level, and then see if the upper edge of the board is level with Beichen." He shook his head slightly and said, "It's wider, blocking Beichen. Change four fingers."

Zheng Yiluan quickly changed the 'Four Fingers' board. After repeating the above action, Zheng Ruo once saw the North Star appear on the edge of the board, and said in a deep voice: "The Four Fingers of Beichen."

His second son quickly wrote down the new boat lamp... After being able to blow the glass by himself, this kind of kerosene lamp that can be carried and weather-proof is not difficult to manufacture, but it is just that it still uses lamp oil as fuel. Especially in the wind and rainy weather at sea, it is really a powerful lighting tool for the crew!

Zheng Ruozeng used the same method to observe the locations of Vega and Northwest Buss Star. He put on reading glasses and searched for a booklet. This was the "Beiyang Star Chart Album" he copied from Fangsi, the Ministry of War.

Finally, he turned to the page he was looking for and slowly recited: "The black water ocean crosses the ocean, look at the four fingers of the North Star, the four fingers of the Vega star in the east, and the seven fingers of the Busi star in the northwest, the eleven and a half fingers of the northwest. Young Master, we have not deviated from the sail."

Everyone was relieved when they heard this. The sea was boundless and it was a long way to sail. Fifty boats were like a team of little ants. No one could help but feel worried, worried that they would go on a vast sea. That would be terrible.

Mr. Zhao was not too worried. Based on his shallow geographical knowledge, they had already entered the dark tide, which is the warm current in Japan.

Even if you are trekking, the most likely possibility is that you are sent to Nagasaki, Japan, like Wang Zhi.

After listening to Mr. Kaiyang's explanation, Zhao Hao basically understood the principle of star-length technique - in a word, the elevation angle of the North Star observed in a certain place on the earth is the latitude of the place... This is a very simple geometric proof question, no need to repeat it.

In order to increase accuracy, observations of other constellations must be supplemented. The voyager records the data observed during the voyage and can obtain the star-striking map. In this way, later generations can use the data of their predecessors to determine their position.

This is the same principle as the octagonal and sextant that were born nearly two hundred years later in Europe. However, the latter is more accurate.

Zhao Hao asked Bei Peijia to test the eight-point instrument first, and ordered him to use the data from the Nanjing Imperial Academy to try to compile the original "Astronomy Calendar". However, now, even the basic map mapping is not standardized, and even the concept of latitude and longitude has not been introduced, so he naturally cannot count on it in a short period of time.

There is no way, there are too many classes to take. You have to eat one bite at a time.

However, when Zheng He went to the West seven times, he followed the star-letting technique and the compass, and the total voyage was not trekking for hundreds of thousands of miles. So for a long time, the star-letting technique was completely trustworthy.

Mr. Kaiyang also told Zhao Hao that the Danyou needle can reach Danluo at the third update.

"At about dawn, you can see the mountains on Danluo Island." Zheng Ruozeng introduced: "Danluo Island is also the most important reference on this route. Once you see it, you can use the single Gui needle to turn northwest, and you can see the Chengshantou of Weihaiwei after 30 o'clock."

~~

The next morning, Zhao Hao had something to do and did not stay in bed for the first time. It was still dawn, and under the service of Secretary Ma, he washed and dressed neatly. He ran to the deck and set up a telescope towards the bow of the ship.

After enjoying the magnificent sea sunrise, he found a black spot on the sea level.

When I looked through the telescope, I saw that the island looked like a tomb with a raised bulge in the middle. Mr. Zhao had read "My Name is Jin Sanshun" and recognized it at a glance that it was Danluo. As for the protrusion in the middle, it was the legendary barbecue mountain... Oh no, Hanna Mountain is here.

The North Koreans believe that standing on this mountain can get the Milky Way, so they gave such an exaggerated name.

Danluo is the Jeju Island in later generations. However, the name "Jeju Island" was privately changed by Emperor Gaozong of the Goryeo Dynasty. However, whether in the Yuan Dynasty or the Ming Dynasty, fathers thought it was too troublesome to change the name, and still used the original name.

Although the North Korean, the first Korean lickering dog in the Ming Dynasty, wanted to change the name several times, but his father was unhappy and disagreed. So the name of Jeju Island was so irrelevant that the Lee Dynasty could only call him behind closed doors and call him. When communicating with his father's country, he still had to use "Tanluo" obediently.

This is the same as ‘Okay, Vinci’.

Zheng Ruozeng also appeared beside Zhao Hao, looking at Danluo Island that is visible to the naked eye, and said gloomy: "This island is not big in the distance. But in fact, it is 150 miles from east to west and 60 miles from north to south, and is as big as two Kunshan counties. And it has been a good place to raise horses since ancient times."

Zhao Hao nodded to express his understanding.

"Originally, Tanluo was an independent country. He paid tribute to me since the Tang Dynasty, and was later annexed by the King of Goryeo." Zheng Ruozeng looked at the green island and said quietly: "Later, he was occupied by the Mongol Yuan as a place to raise horses and exiled prisoners. When my Emperor Taizu expelled the Tartars, Goryeo took the opportunity to go to the "Tanluo Profile" and asked to hand over the Tanluo to them, promising to still pay horses to the Ming Dynasty according to the management model of horse herding in the Yuan Dynasty."

"In order to get Emperor Taizu to agree, they used a trick to reduce the circumference of Danluo by ten times and the population by ten times in the memorial. Emperor Taizu thought this was just a small place hanging alone overseas, and the island was still under the control of the Mongol Yuan at that time, so he generously gave it to them."

"My vassal is not my vassal." Mr. Zhao muttered. In addition to its superior natural conditions, Jeju Island also has an excellent geographical location. It is located at the sea junction between the Ming Dynasty, North Korea and Japan. It is an excellent transit station for Sino-Korean-Japanese trade.

Emperor Taizu was so smart, how could he let Jianzi fool here?

Oh, by the way, the old Zhuziban is not allowed to go into the sea, so why do you want a broken island?

"But fortunately, the Li North Korea is ten times more respectful than Goryeo back then. It is just a person who licks the butts for the Ming Dynasty. We can go to this island as we want, and do whatever we like. We have no laws of the Ming Dynasty to restrain us." Zheng Ruozeng, who left the land, showed his wild side.

He is the number one supporter and advocate of Zhao Hao's maritime strategy. He believes that only by defeating the enemy at sea can the security of the Ming Dynasty be completely guaranteed. Only by crossing the sea and teaching Japan a lesson, knocking them down, and making them like North Korea, calling the Ming Dynasty a father every day can the glory of the Celestial Kingdom be restored!

Danluo is the advance base planned by Zheng Ruo for Zhao Hao. Whether it is used as a commercial base to earn endless silver from the Japanese, or as a future military base, it is excellent to consolidate the army and raise horses here and invade Japan.

"When we return to the voyage, let's go to the island to take a look, and then we will beg you for a long time." Mr. Zhao smiled and comforted him, Zheng Ruozeng, who was in a hurry.

"There is nothing to worry about, it's Heng! The more you are, the more comfortable they will be." Zheng Ruozeng stretched out his hand and clenched his fists, saying as if he was holding Danluo in his hand: "What kind of bird do they do with such a good place? Let's give it to us obediently!"
Chapter completed!