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The waves crashed against the side of the ship, and from time to time there were waves crashing onto the deck, and the sea breeze blew through the sails and made a "hula" and "hula" sound from time to time, and a scolding came from the cabin, "Turtle son, don't let me laugh when you do it yourself." Zhan Wuya was so angry that he threw the pencil in his hand on the table with a "snap".

"Okay, let's see if I'm as wrong as you are." Ma Qianzhi sneered and looked at Zhan Wuya, the discord between the two had already existed, but since he was telegraphed by Chief Huang last time, Zhan Wuya even laughed at him when he found an opportunity, so the two of them can now be said to be on the same footing.

It's a pity that this time, because the other six classes are either taking "cultural classes", or it is their turn to participate in military training, or they are participating in camp labor, and the two classes with a bye had to be combined to escort Su Minyou back to Fuzhou Mansion.

"Okay, you two don't quarrel, this makes everyone outside laugh at you, let's say a word less." Jin Keshou saw that the two might quarrel, so he hurriedly stepped forward to be a peacemaker, and also pushed Qiu Shulei here, hoping that he would also help persuade him.

"Ah, yes, yes." Qiu Shulei hurriedly stood up from the table, he was lying on the table just now looking at the chart, to be honest, he really didn't have much concept of the sea, he just felt that the sea was really too big, and that Dongluo Island was only the size of a booger on the chart he just looked.

He was originally just a farmer in the mountains, after meeting Chief Huang, his fate changed dramatically, he walked out of the mountains to Fucheng, and then came to Dongluo Island by sea boat, and then followed Chief Huang to attack Jiangjiazhuang, this short period of two months made his life wonderful and exciting, although he still didn't know that there were these two words.

Zhan Wuya didn't say anything when he saw that the two of them said this, and handed over the "sextant" in his hand with a snort, Ma Qianyu took it and smiled and walked outside the cabin, obviously the quarrel inside was so loud, and the crew outside also heard it, and when he saw that the head had come out, he hurriedly pretended to be very busy.

Ma Qianzhi knows these things about them, but he doesn't have time to care about them now, what he has to do now is to prove that he is better than Lao Zhan, and he can let him shut his stinky mouth in the future.

So he stood in the middle of the deck of the ship, raised the "sextant" with his right hand, brought the small telescope on it to his eyes, squinted his left eye, and looked into the telescope with his right eye, when the sun was almost in the sky, so he looked at the horizon of the sea through the small telescope, and at the same time adjusted the movable arm of the "sextant" with his left hand.

Fortunately, although there are wind and waves on the sea now, it is not too big, Ma Qianyu subtly adjusted the movable arm, and finally let the light of the sun above his head just reflect on the small telescope, well, now the image of the sun has coincided with the horizontal line of the sea.

Ma Qianzhi pressed the movable arm, took the "sextant" in front of him, and checked the scale according to what Chief Huang had taught in the culture class a few weeks ago, and memorized it in his heart, so that he could be regarded as the angle of the distance of the sun from the horizon.

This "sextant" is really a good thing, Ma Qianzhi touched this "sextant" made of brass, and Chief Huang said that it was a "John" in the upper realm? Hadley" invented this thing, and the name of this sage sounded strange, like the natives of the overseas countries.

But he was able to measure the angle between the sun, the stars and the sea through two glass mirrors, one of which was transparent on one side and a fixed mirror for reflection on the other, and the other was mounted on a movable arm, so that he could accurately locate the sun, the stars, and the horizon of the sea.

It's ridiculous that the shopkeeper Chen still cherished his own star-pulling technique, but now this "sextant" is not much stronger than the star-holding board in his hand, and the star-holding board Ma Qianzhi has also seen it once, and it is just made of high-quality ebony.

It consists of twelve square planks, the largest of which is about seven inches and two on each side, and the smallest one is about half an inch long on each side. In addition, a small square made of ivory, with four corners missing, and the length of the four sides of the missing carving is one-quarter, one-half, three-quarter, and one-eighth of the length of the smallest piece above, which is what everyone heard when Mr. Su introduced it to Chief Huang later.

Mr. Su also said that when observing the North Star with the star drawing board, he should hold the center of one end of the board with his left hand, straighten his arm, and look at the sky, saying that the upper edge of the board is the North Star, and the lower edge is the horizontal line, so that the height of the North Star at that time can be measured.

It is also said that according to the height of the difference, twelve wooden planks and ivory blocks can be replaced and adjusted. After finding the altitude of the North Star, the geographical latitude of the location can be calculated.

This kind of cumbersome algorithm, which can be mastered by ordinary shipwrights, is in the hands of the shipowner or a certain master, so when the shopkeeper Chen was rescued and saw the "sextant" they used, the look on his face was really interesting.

……

Ma Qianyu walked into the cabin with the "sextant", and the other two immediately stood up and got out of the way, while Zhan Wuya was still sitting at the table, still thinking about how to calculate the latitude and longitude, without even raising his head.

Looking at the watch on his wrist, it was already 11:35 noon, Ma Qianzhi dragged the perpetual calendar over, which Huangshi specially found someone to compile for them, and there were daily equatorial coordinates of the sun on it, so he took the black "calculator" beside Zhan Wuya and put it in front of him.

Then I wrote down the formula taught by Chief Huang on the paper first, and then filled in those angles and other parameters one by one, and used the "calculator" to crackle and calculate, and soon after, the longitude and latitude were obtained.

"We should have arrived near Dalun Island, and we should have returned to Dongluo Island after walking thirty miles to the southwest." Ma Qianzhi used two long transparent rulers, one horizontal and one firm, to compare and draw on the chart, and soon found their current location, the positioning of the "sextant" is very accurate, and the general error will not exceed two miles.

Zhan Wuya was about to speak, when he heard someone shouting outside the cabin, "Report sir, there are three ships heading towards my ship ahead. ”

"Three ships." Everyone was taken aback when they heard this, especially Ma Qian's three of them, because there are very few ships passing by in the area of Dalun Island, not to mention that there are three ships here, and they don't know what they are from.

So everyone ran out of the cabin, and when they saw that the people on the boat were shouting because of the lookout on the fight, they all ran to the side of the ship, but no matter how much they stretched their necks to look ahead, they were too far away to see what was in front of them.

"Give me all back, what should I do, don't pile it all up here for me." Zhan Wuya shouted loudly.

After everyone dispersed, Zhan Wuya said to the other three, "I'll go up and take a look." ”

"Okay, then you go, I'll let them turn the rudder first." Ma Qianzhi and Jin Keshou are a little older, and Qiu Shulei said that although he studied seriously, he couldn't help much now, and this mast climbing work was indeed only suitable for Zhan Wuyi.

"You come down first, I'll take a look." Zhan Wuya ran under the mast and let the young man who was in charge of the lookout come down, this young man was a member of the original Jiang family, but unfortunately he didn't have long been in contact with this piece for a long time, and it was estimated that he didn't know what to say about more things, so it was better to come in person.

But this young man has good courage, because some timid people do not dare to climb it at all, and such a high mast sometimes shakes so badly when the wind and waves are a little stronger, let alone look around on it.

Seeing that the young man slid down neatly, Zhan Wuya smiled and patted him on the shoulder, "Very good, give me that clairvoyance." ”

Hanging the clairvoyant mirror around his neck, Zhan Wuya took off his socks, stuffed them into his liberation shoes, and then spat and rubbed them hot with both hands, and as soon as he held the mast with both hands, he quickly climbed up in the eyes of the young man.

The young man stood under the mast and looked at the above, and then at the sea beyond the ship, and now in that direction except for the vast waves, the shadow of the sails of the blessed ship, which could be clearly seen in the clairvoyant mirror, was now standing on the deck but could not see clearly at all.

No wonder I heard them say yesterday that Chief Huang once said that this ground is actually round, or like a ball, exactly like the "globe" in the cabin now, but if that is the case, the people who live below will not all fall, thinking about this scene, their legs and feet are weak.

"Old horse, there are three lucky boats, but ......" Zhan Wuya sat cross-legged in the fight, hugged the mast, and put down the clairvoyant mirror, the boat is now jolting in the waves, and in this mirror, I only have time to see what kind of ship it is, but I don't have time to see what people on the boat are.

Since these people engaged in maritime commerce are generally both merchants and thieves, especially now that the other party still has three ships, this is too much of a threat to their own ship, so Jin Keshou and Ma Qianshou ran to their respective responsible positions, with Ma Qianzhi in charge of the helm and Jin Keshou in charge of adjusting the sails.

"Everyone, all work hard, and give me the sails full, in the southeast direction." Ma Qianzhi shouted at the helm while he was at the helm.

Hearing this, Qiu Shulei also hurriedly ran under the mast, there was a wooden wheel specially used for raising sails, he felt that his palms were sweaty, and his heart was beating so nervously that the soft feeling on his hands was very weak.

But seeing that Jin Keshou was also here, he felt that his heart seemed to be a little more settled, so he shook his hand like others, and felt better, and then in the sound of Jin Keshou's horn, he and the surrounding hands pulled the wooden handle of the wooden wheel hard, and slowly pulled up all the hard sails that were half-hung just now.

Before the sail was full, I heard Diao Dou's endless exclamation, "It's a real widow." "Because when he picked up the clairvoyant mirror again and looked at several ships in the distance, the figures who appeared in the clairvoyance mirror were actually short, but the hair on their heads was shaved into a half-moon shape, and in this autumn sea breeze, the upper body was only wearing single clothes, and the lower body was almost naked only wearing crotch cloth, and when he looked at their feet, he found that they were not wearing shoes but were barefoot, and they were holding spears and knives in their hands, which was not what the real widow was.