The cold outside the window is pressing, and the temperature in the flower hall is warm with the heat emitted by the stove. However, after sitting for a long time, it will always make people feel a little cold legs, although his knees are covered with a fox fur quilt, but the cold of his feet still makes Zhu Mingzhong feel a little uncomfortable.

"Hurry up and order someone to make a charcoal box to warm your feet......"

Thinking so in his heart, Zhu Mingzhong once again crouched down on the desk and continued to draw drawings on the table, this is a drawing of a sail cruiser, for two months, whenever he has time, he will lie on the desk and draw this drawing, each time drawing until late at night.

With the light of a few candles on the candlestick, with the help of various drawing tools such as rulers, a drawing was quickly completed, and the number on the drawing was 95.

This is the 95th drawing!

After drawing this drawing, Zhu Mingzhong took out his mobile phone again, this is his Xiaomi Mi 5 mobile phone, the reason why he chose it at the beginning, not only because he has been using Xiaomi mobile phones, but also because the memory of the mobile phone is large enough.

Earlier, in addition to finding that the phone's battery was still full, more importantly, he accidentally found some files in the phone - it was only then that Zhu Mingzhong remembered that he had used his mobile phone to download e-books such as "Anatomy of the Constitution" and "Anatomy of Victory", of course, not for his own reading, but to pass on to his roommates in college for him to make models or as references. I never thought that the e-book I downloaded at the beginning was always saved in my mobile phone.

These e-books may have had no use in the past, but now, Zhu Mingzhong has been unable to calm down for a long time, because these e-books mean that China's shipbuilding technology, which is already lagging behind the West, can quickly surpass Europe and be more than a century ahead of them.

However, in addition to being excited, Zhu Mingzhong also knows very well that unless the drawings are drawn one by one before the battery is exhausted, everything is empty talk. For this reason, he will work day and night to draw the drawing, in order to complete it as soon as possible.

“99%……”

Again, looking at the battery level on the screen, Zhu Mingzhong's brows locked slightly.

"If it is turned off, it should still be recovering power......"

Muttering to himself, Zhu Mingzhong took this mobile phone and looked at it carefully again, this mobile phone brought him too many surprises, in addition to those e-books, the bigger surprise is that its power seems to be inexhaustible, and even after shutting down, the battery power will automatically recover to 100%.

"Maybe it's the effect of the crossing!"

Just as your strength has become greater and your body has become stronger, perhaps, crossing has also taken a toll on your phone.

"It seems that the yield of those potatoes has also changed, and it must be the impact of the crossing. If it were in the 21st century, maybe it would be developed with this battery! ”

Thinking to himself in his heart, Zhu Mingzhong once again looked at the files in his mobile phone, although he couldn't connect to the network, but the content stored in the mobile phone still brought him some surprises, such as in the chat history of the QQ group, he found a scale map of the front-loading gun, which was the scale map of the "twelve-pounder Napoleon gun" he had been longing for, and even a picture of the gun truck.

"It's a pity that there are no drawings of a steam engine or a train! Hey, sixth child, you said you, why are your hobbies so narrow? You should have a game of land, sea and air......"

When he complained so much in his heart, Zhu Mingzhong laughed at himself again.

"Come on, don't get cheap and sell well, even if these e-books can be copied down, it's enough to go against the sky!"

At least with these ships, whether it is the line of the hull or the proportional drawings of the steer, rigging and artillery, and of course, the simple flint engine that frees the warship's guns from the arquebus, it is guaranteed that the Chinese navy will become the hegemon of the ocean for at least the next century and a half.

And, of course......

looked at the chat history that a netizen once posted on his phone.

“…… After observing the trajectory of the moon for 3 years without success, scientists from the Royal French Academy of Sciences decided to try the Jupiter satellite positioning method proposed by Galileo. At this time, it happened that the Italian Cassini published an accurate catalog of Jupiter's moons in 1668, so the French invited him to be the director of the observatory, and under his auspices, he surveyed and mapped a new version of the European map with accurate longitude, and initially drew a new map of the world. ”

This seemingly simple sentence made Zhu Mingzhong's face filled with a certain smile, although he only knew a little about navigation, he knew very well the importance of longitude.

After Columbus arrived in the Americas in 1492, there was a seafaring fever among the Western seafaring powers. However, due to the fact that people could only measure the latitude according to the height of the sun, but could not locate the longitude, which meant that freedom of navigation was very risky, so a large number of ships got lost and ran aground, and Spain, a great seafaring country at that time, suffered particularly heavy losses.

And the solution to this problem is the "moon distance method" and the "clock method"!

The former was proposed by the German astronomer Johannes Werner in 1514 as the "lunar distance method", that is, the moon passes through the sky at a steady speed, and the longitude can be determined according to its trajectory and the relative position of a star it passes by. Later, 16 years later, the Dutch scientist Gamma Friesis proposed the "clocking method", that is, to make an accurate clock, go according to the time of departure, and then use the sun to measure the local time after arriving at the new location, and determine the longitude with the time difference. Unfortunately, these two assumptions are difficult to realize due to poor basic monitoring and poor watchmaking technology, respectively.

"Longitude!"

muttering these two words softly, looking at the various materials of the "lunar distance method" in the chat content of netizens, from Werner's proposal in 1514 to 1766, when Mascalin published the first volume of "Nautical Almanac and Astronomical Ephemeris", it took European astronomers two and a half centuries to solve the many problems faced by the "lunar distance method". Since then, seafarers have been able to reduce the time to calculate longitude from four hours to 30 minutes as long as they have this yearbook.

Of course, at that time, the "clock method" was also a breakthrough because of Harrison's invention of the "marine clock", and the cross-use of the two methods greatly promoted the development of the navigation industry, and Britain also won the supreme honor. Before the birth of the international prime meridian, the maps of various countries used their capitals or observatories as the zero longitude point, and some navigators also preferred to use the starting point of a certain voyage as the zero longitude point, but with the development of British sea power and the wide circulation of the "Nautical Almanac" published by Greenwich, the Greenwich meridian was gradually accepted by most navigators.

Of course, more importantly, in the following decades, the British relied on longitude to re-measure the world, discovering uninhabited areas such as Australia, and it was precisely because of the measurement of longitude that the glorious Age of Discovery ended.

"Now, this honor will go to China!"

Look at the complex and beautiful set of equations in the chat log, which describes the relative motion between the Earth, the Sun, and the Moon, a problem that once plagued Newton and was the backbone of the "lunar distance method."

"It only takes 20 years at most to draw a catalog of the northern and southern hemispheres, and then the voyage on the sea will no longer be a dangerous road full of dangers! ”

When thinking about it in his heart, Zhu Mingzhong, who was beaming, looked at the complex and beautiful equations, and he was even a little grateful to the netizens in this group for their sincerity, if it weren't for their truthfulness, I'm afraid no one would have posted this formula that supported the "moon distance method".

"As long as the longitude is solved, it will be possible to migrate across the Pacific Ocean to the Americas, and there will be no need to worry about sepsis during ocean voyages, no!"

Suddenly, Zhu Mingzhong looked at his phone as if he remembered something, and his brows suddenly locked.

Sepsis was perhaps the deadliest disease of the Age of Discovery, as many sailors contracted sepsis and died due to the lack of fresh vegetables on board the ship for a long time, and the lack of vitamins in the body caused many sailors to suffer from sepsis. During the Age of Discovery, many sailors and immigrants were killed by scurvy. As for the so-called "Zheng He's fleet used bean sprouts to avoid sepsis", it is simply an ignorant joke.

"Not to mention that the vitamin C content of bean sprouts is only 8 mg per 100 grams, each person needs to eat one pound of bean sprouts per day to meet the needs, that is, the fresh water consumed by soaking bean sprouts every day cannot be provided for ocean voyages, not to mention that Zheng He's fleet is a nearshore voyage, which can replenish fresh vegetables and fruits itself......"

Looking at the content of the mobile phone chat log, Zhu Mingzhong's face showed a smile, even now, he can feel the sarcasm of this netizen who used a mocking tone to ridicule a certain pseudoscience.

"Tea? Tea may seem more suitable, but green tea contains 19 mg of vitamin C per 100 grams, how many taels of tea do you drink every day? Don't bitter you? ”

"Kimchi? I don't know the vitamin C content of kimchi, but the vitamin C content of sour cabbage is 2 mg per 100 grams, how much can I eat? ”

These chat records stored in the mobile phone make Zhu Mingzhong can't help but have a kind of longing for the future, maybe most of these netizens are unfamiliar, but now looking at this familiar text, it will always make people feel a little sad.

"These data are all from the so, to sum up, the bean sprouts that need to be changed every day to brew are by no means suitable for vitamin C supplements when sailing in the ocean, as for green tea can barely provide a little vitamin C, and brown rice does not contain vitamin C, but rich in vitamins such as imitation vitamin A, compared to polished rice and flour, brown rice is more suitable for the Age of Discovery, but considering that the ship is light, biscuits are undoubtedly more suitable for ......"

Of course, this is not the key to Zhu Mingzhong looking through the chat history for such a long time, knowing that this guy likes to sell him, and continued to look through it.

"In fact, the most suitable vitamin C supplement for the Age of Discovery is an inconspicuous thing, it is abundant in quantity, has a wide range of sources, and can be stored for a long time, even if it is stored for several years, there is no problem......