In the face of this scholar's questioning, Zhang Yuan was not in a hurry, and turned out another paper below, which expounded the climate and environment on the far side of the planet from the aspect of ocean currents.

On the blackboard, he drew a map of the planet's ocean currents with chalk: "If you stand in the atmosphere above the North Pole and look down at the whole planet, you can see that the ocean currents of the whole planet rotate counterclockwise. Everyone should know that the warm current of our Boulder City flows from the west to the east. That is, from a warm place to a cold place. ”

"Under the influence of this warm current, the temperature here is a little warmer than the rest of the region."

Due to the uneven heating of the planet, energy will spontaneously transfer from hot areas to cold regions, which is the law of thermodynamics.

The planet is tidally locked by stars, and the rotation period is equal to the revolution period, not without rotation. The geostrophic deflection force generated by such a slight rotation leads to the general trend of ocean currents and air currents to be counterclockwise.

"And what does this lead to?"

Zhang Yuan drew a circle on the blackboard.

"On the other side of the planet, ocean currents flow from the east to the west. That is, from the cold zone to the warm zone. ”

"If a cold snap hits land, it will greatly reduce the temperature in this area."

"Therefore, the climate on the back side of the planet, theoretically, will be colder than this side, and the temperature of the same meridian, the same latitude, and the light zone is expected to be about ten degrees lower than this end, that is, the original 40 degrees Celsius, to 30 degrees Celsius."

"What if, we found a continent in the Belt?"

"There is light, there is a continent, the climate is right, and it will become a new paradise for mankind!"

"As long as it exists, and we can...... Discover it! ”

The ambitious third expedition has begun again.

This time, although it was justified, it still frightened many people. Some people began to mock Zhang Yuan's whimsy again, and even many of the sailors in the family showed hesitation and fear, and they were reluctant to participate in such activities.

Explore the globe!

A feat that has never been done before in the world!

The globe of this world is far more difficult than that of Earth. Because the earth has a large continent, there are many points that can be ashore for supply, but this world does not, the island distribution of the whole world is equivalent to only one Southeast Asian archipelago, what Eurasian continent, South America, North America, Australia, Antarctica, all of them!

Being away from land for a long time, not to mention the difficulty of supplying supplies, will cause a serious sense of panic in everyone's hearts after a long time.

Zhang Yuan also knew that this might be the last expedition in his life, he was in his 40s, and his body was starting to decline.

This may be the last chance for the whole world.

For the family, unwilling to participate in the expedition with sailors, he also did not force. The whole of Boulder City is full of young people who want to get rich and gain fame.

However, no one knows whether this expedition is a long march to victory or a road to death.

"If it fails this time, there will be no more places to explore, and honestly retire at home, haha!" Zhang Yuan turned his head and said with a smile at his sister Anna.

Yes, if it fails, the world can only be like this.

There is no way for man to fight against the whole world. It is also good to be honest and calm down, develop some science, and develop productive forces.

Of course, in the current environment, no matter how much it develops, Zhang Yuan thinks that it is impossible to break through the upper boundary, and will only die slowly...... But it's better than not developing at all.

"Goodbye to my uncle!"

Sister Anna is already a noblewoman, a mother of three children. "In the future, you will also be a great navigator. ”

Although she still can't understand her brother's choice, she can only support it in the end.

"Goodbye!" All family and friends are on shore to say goodbye.

Zhang Yuan embarked on a new steamer, the Victory, a faster, steam-powered, schooner with technological innovation.

In total, there were 8 similar large steamers in the entire fleet. Zhang Yuan once again lost all the property he had earned over the years, and started the third expedition in the midst of people's discussions, blessings, worship, ridicule, and expectations.

A historian wrote in his book: "Count Hoffmann, even if he did not discover any New World, even if the third voyage failed, is enough to be remembered by history......"

"World, we need a continent, a continent full of light!"

"Let's discover it, in our world, many suffering people are still hungry, they are homeless, and they have no clothes to wear, let's find it......"

Zhang Yuan took a deep breath and gave orders: "Yang Fan, set sail!" ”

The entire round-the-world expedition will go through the Arctic route to the other side of the planet. 5 ships loaded with 3000 people, if it goes well, it takes 300 days, if it goes well, it can take 400 or even 500 days.

It was bound to be a difficult trip.

A young sailor pulled the rope with both hands, hoisted the sails, and looked at the lights of Boulder City, and he suddenly had a feeling of reluctance.

He asked the first mate around him, "Locke, what would happen if we did discover a new continent on the far side of the planet?" Will we get rich? ”

"Stinky boy, it's whimsical to be here so early!" The first mate grinned and said, "Even the Earl is not so sure. But...... Do you know what a new continent means to us? ”

"What?"

He opened his hands as if embracing the future: "We will be the heroes of Boulder City!" We will be remembered by history! Our name, a thousand years from now, can still be mentioned by humans. ”

"Whether it's wealth or honor, the choice is yours, and if you want, you can even get a fief in the New World and become the master of the manor! Of course, only if we survive and see the sun in the New World...... If there is a sun! ”

"The sun, how beautiful. I don't know, have you ever seen the sun in the distance? ”

"What if, there is no New World?" The young sailor asked again.

"Isn't there a new continent...... his brows furrowed sharply, and he sighed: "Actually, it's nothing, it's equivalent to an ultra-long-distance voyage...... The Earl will naturally pay you a salary, and no one will be missing. ”

"However, there is no New World ......"

He turned his head to look at a lit room on the upper deck, "Lord Count may be going bankrupt again." I really can't imagine that there will be anyone else in the world willing to explore this dark and vast world. ”

"How I wish there was a new continent......"

At the thought of a long time at sea in the future, everyone lost interest in talking.

Everyone carries a hint of confusion, a hint of yearning, and ...... A hint of apprehension about the future.

The "Victory" whined, and with a little heaviness, left Boulder. Everyone doesn't know what their future looks like. The priest on board the ship performed a very traditional prayer ceremony.

"May we not regret our choice today."

……