The eagle's eyesight is good because its optic cells have more of a thing called "macula" in object imaging.

The macular of an eagle has 5 times more cells than a human, so it can see 4~8 times farther than a human.

So, you may want to ask, how far can the human eye see at its best?

Scientists have calculated that the farthest distance S (unit: km) that a person can see at sea level on a clear day can be estimated using the formula S squared = 16.88h. The answer is 25 km!

Of course, it refers to vague vision, if you can still see the target at 25 kilometers like a magnifying glass, then you must be a fairy in the sky, a big cousin with a thousand miles of eyes!

When a person climbs an observation deck, how far can they see when the eye is 35m above sea level. A: 590.80KM!

Of course, observing the sea level is somewhat open, just according to normal people in the city.

When people's eyesight is greater than 500 meters in the city, there is a blurred image of the scene. When the distance is shortened to 250~270m, the outline of the scenery can be seen clearly, and if you want to identify the type of flowers and trees, it must be shortened to within a few tens of meters.

However, if you are nearsighted, I didn't say anything above.

Everyone's eyesight varies greatly, with some pilots being able to see an airplane from up to 20 kilometers away and others not being able to see as close as 8 kilometers.

In addition, the human eye has another characteristic: if you have seen an airplane or a ship, you can not see it until more than 10 kilometers if you keep staring at it and let the airplane and ship gradually move away. On the contrary, looking for planes out of thin air in the sky or ships on the surface of the sea, sometimes they have not been found at a distance of 5 kilometers.

A pair of normal human eyes can see at infinity distance. At night, you can see the moon 380,000 kilometers away from the Earth, and even the stars hundreds of millions of light-years away.

Here's the difference between humans and other animals, as well as eagle eyes.

Seeing and seeing clearly are completely different things, and a nearsighted eye can see people in the distance, but can he see clearly whether it is his friend or a street sweeper?

At this moment!

Also under the night vision binoculars, Zhu Zilong's younger brothers could only roughly find that there were two big ships in the distance of NNNN.

But Zhu Zilong can clearly see that there is a big boat, and he can also see how many people are on the ship, and even how many men and women there are, this is the difference between heaven and earth. (The half-dragon eagle eye, sure enough, it has a huge advantage to peek at the girl's bath.) ）

Just when the little brothers were still confused, Zhu Zilong had already seen what he should know with the help of the night vision half-dragon man's eye of heaven.

Immediately, his brow furrowed.

The race ahead is not a Chinese ship, nor a Japanese, but a Westerner.

That's right, the two big ships far away from the NNN in front of them should look like merchant ships like the Portuguese.

For the Portuguese and the like, Zhu Zilong also did not have much affection. In the original history, the Portuguese obtained the right of residence on the southern coast of the Ming Dynasty in 1557. Then they regarded Macau as the pearl of their East Asian trade, and on December 1, 1887, the Portuguese directly occupied Macau, and Macau began to be forcibly leased by Portugal!

At this time, in 1626, these foreign devils should have set up a trading house in Macao, so that they could export directly overseas without passing through Guangzhou.

Why did two of their big ships suddenly appear not far from Japan?

Zhu Zilong, who couldn't figure it out, decided not to think about it anymore, and it seemed that the one behind it was a pirate ship, which was attacking the merchant ship in front. They are all foreigners, that is, they are dog-eat-dog!

It's natural to sit on the mountain and watch the tiger fight, but do you want to go over and eat black afterwards?

After thinking for less than ten seconds, Zhu Zilong's heart was horizontal, it was too normal to sink a few big ships on the sea, let alone hundreds of years ago.

If they die, they will die, and no one will help them avenge them, and no one will know.

Brother finally bumped into a foreigner who could be used as a test subject for naval warfare, and they are almost no longer threatening in the internal fighting, so if you don't do it at this time, when will you stay?

"It's a Portuguese pirate, all ready to fight, the first column follows Zheng He's treasure ship, the second column breaks the back road on the flank, and the third column stays behind."

After Zhu Zilong's order was issued, all the staff immediately took action.

Subsequently, Zhu Zilong went to the bow of the ship again, got on the foremast Wangdou, and issued orders from Wangdou from time to time to adjust the direction so that the distance between the two sides was quickly approaching.

On the ship, the golden dragon five-star national flag symbolizing the new Ming Dynasty China is hoisted and fluttering in the wind. Well, however, it didn't work, and no one could see it at night.

There was no national flag in the Ming Dynasty, and this golden dragon five-star was purely Zhu Zilong's personal hobby.

Needless to say, the five stars represent his identity as Zhu Zilong as a new China traverser, and the golden dragon represents Daming and the Chinese as the descendants of the dragon. It's just that outsiders don't know!

In Zhu Zilong's heart, safeguarding the interests of himself and the country is paramount.

Soon, the tricolor flag above the main mast in front proved that they were Dutch battleships. It's not far away!

It was only at this time that the foreign devils of civil strife discovered that a third foreign enemy suddenly came over in the night. Before, because Zhu Zilong's fleet was parked on the edge of the island, it would only make people think that it was an island at night, so they couldn't find that there were other ships here.

Zhu Zilong waved his hand and ordered: "The first level of the battle is ready to begin!" ”

"Combat Level 2 Preparation!" "Combat Level 3 Preparation!"

"The human cannon is released (of course it's impossible, I'm just spoofing)!"

Soon, on the battle group of Zhu Zilong's fleet, everyone put away all the tables, chairs, benches, pots and pans, and all kinds of sundries to prevent damage during the battle or injury to their own people.

In the first and second layers of the gun deck, the commander and the gunners loosened the gun cables, the gun doors were raised, and the muzzles of a thousand pounds of imitation guns stretched out of the gun doors.

There were not many guns on the 400-500 material ship, with two gun decks, ten on the left and right sides, and five on the upper and lower sides. Each gun deck has a squad leader commander, each gun has an armor commander, and each gun has two or three gunners. Two reserve personnel!

Wang Binghe came over and reported to Zhu Zilong: "Big brother, these hairy devils' warships seem to want to run. ”

Want to run, is it possible?

The corners of Zhu Zilong's mouth smiled, and he said: "You see that the draft of those ships is very deep, and they must have looted a lot of good things nearby, or there are a lot of goods on them. So much so that the hull was too heavy and the speed decreased. Although it is upwind, it can't improve much speed for a while! ”

Wang Binghe touched his head and said, "But big brother, we are downwind, and the speed is slower than them, and we won't be able to keep up for a while." ”

"The other party is already a paper tiger, let the people behind follow at the current speed, open the lock of the treasure ship's diesel engine room, preheat, and I will personally go out to open it. Get ready for battle, let's have a single treasure ship, one against two, go up to fight him first! ”

Zhu Zilong's eyes burst with a fine light, and he shouted confidently.