Zhu Jingyuan and Qi Yanhuai discussed Ningbo, because there was a missile test base belonging to the Ordnance Department.

The missile test base was placed here because Zhoushan County, which is subordinate to Ningbo Prefecture, has the largest naval port in the Ming Dynasty.

Due to the direct attention of Zhu Jingyuan and Zhu Zhongliang, Daming's missile research was aimed at the navy from the very beginning.

After the military missile is tested on the ground, it will be loaded into the warship for testing immediately.

Therefore, the specifications of the missiles designed by the Daming Ordnance Department are still focused on the scale that the ship can carry.

For the time being, there is no special effort to design an extraordinarily large transcontinental strategic missile.

Because the territorial scope of the Ming Dynasty is much larger than that of any nuclear power in the previous life.

Two-thirds of the world's land is already under the rule of the Ming Dynasty.

The remaining one-third of the land, part of which is in the western part of Mozhou, is directly adjacent to the land of Mozhou in the Ming Dynasty.

The other part is the mainland of the Tessie countries.

The Ming Dynasty owned the islands of Crete and Tunisia in North Mexico, as well as lands on the northwestern shores of the Caspian Sea.

In these places, the range of Daming's missiles only needs to reach 3,000 kilometers to cover the entire mainland of the Taixi country.

This later fell under the category of medium-range ballistic missiles.

Zhu Jingyuan was ready to design directly from the beginning to a scale that could be mounted on a battleship.

Although it is a level below the scale of the space launch vehicle, the technology of the two sides is still the same.

In the process of designing large launch vehicles, small and medium-sized rockets for verification purposes are enough for this task.

The missile test base and some facilities can be directly used as an experimental base for rocket launches.

In the past, Cape Canaveral, the largest space launch center in the United States, was next to Patrick Air Force Base.

If the construction of a new launch base is not specifically discussed, Daming's follow-up rocket experiments will be in Ningbo-Zhoushan.

Qi Yanhuai raised the issue of selecting a site for the construction of the launch base, obviously hoping very much to build a special rocket launch base.

And the goal is very clear, that is, I want to build it next to the equator as much as possible.

Zhu Jingyuan understood his thoughts, and it was indeed more labor-saving to launch most satellites on the equator.

However, Zhu Jingyuan did not make a decision immediately, and first asked someone to bring a world map.

Recall the locations of several important launch bases in previous lives, and compare their locations and latitudes against the map.

Prepare to refer to the direct experience of the major powers in previous lives.

The most important rocket launch base in the United States is Cape Canaveral in Florida.

It was the southernmost point of the American mainland.

If my memory is correct, the latitude should be between 28 and 29 degrees.

Zhu Jingyuan glanced at the North Yinzhou region on the world map, and confirmed that his memory was correct according to the 30th parallel of north latitude that he crossed on the Florida Peninsula.

Then there is the Xichang Satellite Launch Base in China, which is very close to Cape Canaveral, also around 28 degrees.

The Wenchang Satellite Base at the southern tip of Shenzhou is between 19 and 20 degrees latitude.

Ningbo, Zhejiang, which I have considered, is probably on the 30th parallel north latitude, which is a little higher than Cape Canaveral and Xichang.

If you insist on placing the space base in Ningbo-Zhoushan, it will be close to Cape Canaveral in latitude.

Already much better than the Baikonur launch site at 45 degrees north latitude in Lucia.

And now and in the future, the capital of the Ming Dynasty is Yingtianfu, and Ningbo can be said to be under the nose of Yingtianfu.

It's easy and straightforward enough to manage.

In this way, the comprehensive conditions of Ningbo are better than those of Cape Canaveral.

It's just that Zhu Jingyuan also wants to evaluate how much better the more idealized equator can be compared to Ningbo.

So Zhu Jingyuan picked up a pen and paper and briefly calculated the linear speed of the earth's rotation in several alternative places.

The formula is very simple, take the cosine of the local latitude, multiply it by the circumference of the Earth's equator, and divide it by the time of day.

The linear speed of Ningbo, Xichang and Cape Canavenal is about 408 meters per second.

The local speed of the Earth's rotation in Wenchang is 438 meters per second.

The linear velocity at the equator is 465 meters per second.

The linear velocity of the Earth's rotation can be considered as the initial acceleration of the rocket launch.

The greater the initial acceleration provided by the Earth, the less fuel the rocket consumes to send the satellite to the same speed and altitude.

The launch site in Wenchang can save 30 meters per second in acceleration compared with Xichang.

The equator saves 60 meters per second of acceleration than Ningbo.

Zhu Jingyuan vaguely remembered that he had mentioned it in some news he had seen in his previous life.

It is said that the payload of the rocket launched by Wenchang can be increased by more than 7% compared with the Xichang launch.

The Long March 5 rocket's geosynchronous transfer orbit payload is 14 tons, and 7 percent of the weight is close to one ton.

According to the unit price of 150,000 yuan for one kilogram of geosynchronous transfer orbit load, the income of one ton of load is 150 million.

If the data in such news reports are true, then the difference between the payload of the same rocket and the launch site in the equator or Ningbo may be more than 15 percent.

If the 14-ton payload of the Long March 5 is still calculated, the income gap of the Long March 5 will widen to 300 million.

The total cost of a long five is about 700 million.

Although Zhu Jingyuan has become an emperor, he does not know how many resources and money he manages.

But I'm still a little concerned about the proportion of this data.

At the same time, Zhu Jingyuan also knows that if he wants to send satellites to geosynchronous orbit, the advantages of the equatorial region will be even greater.

Not only is it labor-saving, but it also saves time, and the process is simpler.

There are two most important basic parameters for the orbital data of artificial satellites orbiting the Earth.

One is the angle between the orbit of the satellite and the equator, also known as the orbital inclination.

One is the distance of the satellite's orbit from the ground, also known as the orbital altitude.

If the satellite's predetermined orbital inclination is greater than or equal to the latitude where the rocket launch site is located, the rocket can be launched directly.

If the orbital inclination is less than the latitude, the rocket or satellite will have to change the orbit to reduce the inclination.

There will be one more control and adjustment link in the entire satellite launch process.

The lower the latitude of the launch site, the greater the range of orbital inclination that can be directly delivered.

The latitude of the equator is zero, less than all inclinations......

Therefore, if the launch site is built exactly on the equator, it can theoretically reduce the overall operation link.

In the previous life, the French Guiana Space Center in South Yinzhou had only five degrees of latitude.

Geosynchronous transfer orbits with an inclination of more than five degrees to the equator can be delivered directly at a very reasonable cost.

And the whole journey takes less than half an hour.

The Baikonur launch site in Lucia, located at the forty-fifth parallel north latitude.

For most of the satellites, Lucia is sent to a synchronous transfer orbit with an inclination greater than 45 degrees.

Then the inclination angle was reduced with the engine, and the transfer to the synchronous transfer orbit of the target.

If you want to send to an orbit parallel to the equator, the whole process takes almost seven hours......

Most of the time the rocket is flamed off, and the power is mainly used to fly out of the atmosphere and adjust the orbit.

The purpose of such multiple ignitions is, of course, to save fuel, but the pressure on the communication and control systems is also higher.

In comparison, one is a single line and the other requires four stops......

Of course, Baikonur can also be forcibly sent directly.

That is, it is continuously turning on the engine, adjusting the orbit angle while flying out, and the effect is similar to drifting.

The result is reduced capacity, soaring shipping costs, and more difficult to control.

If the main launch base of Daming's rocket is placed in Ningbo, the conditions will definitely be much better than Baikonur.

The lowest inclination angle of 30 degrees can also meet the needs of most satellites.

But compared to the idealized equatorial region, there will certainly still be a significant gap.

But how much is it worse?

Qin Tianjian may have done research before, but it was not officially conducted.

It's all informal, and no large-scale experiments have been done, and there may not even be large-scale checks.

It's better to let them study it formally, and it's not too late to make a decision.

Zhu Jingyuan had this idea in his heart, so he raised his head and instructed Niu Jian beside him:

"Call and call a few people from the Ministry of Construction, people from the Royal Engineering Company."

The administrative area of Yingtianfu New Town is specially planned, and the distance between the main departments is not too far.

Zhu Jingyuan's original request was to arrive within three minutes of each other.

Of course, three minutes refers to the time on the road.

It also takes time for the parties to prepare things to go up and down the stairs.

So about five minutes later, the people from the Ministry of Construction and the Royal Works arrived.

Several courtiers and stewards saluted Zhu Jingyuan together with a rather curious attitude:

"Your Majesty, Ministers."

Zhu Jingyuan waved his hand very casually:

"Sit down, you guys stop for a while, and when the meeting is almost over, there will be a job for you."

Then Zhu Jingyuan looked at Qi Yanhuai:

"This is the most suitable base site for launching geostationary orbit satellites.

"Regarding the false moon for longitudinal orbit, it should be said that it is a false moon in a polar orbit, and a false moon in a reverse orbit.

"The most suitable location for the base should be the opposite of the synchronous orbit.

"So it's as low latitude as possible, right?

"Mr. Qi has also considered this aspect, right?"

Qi Yanhuai immediately arched his hand and said:

"Your Majesty, the ministers and colleagues have indeed discussed it.

"Let the false moon pass through the same point on the earth every day, so that it is convenient to continuously observe the situation in the same place.

"It is necessary to make the false moon pass at the same height of the sun at any place, so that it is convenient to continuously observe the situation on the ground and form a picture of the ground with the same illumination.

"It is necessary to let the false moon pass over the poles, and the angle between the orbit and the equator is slightly more than the right angle.

"In this way, when observing from the ground, every day when the false moon appears, it will retrograde from east to west at a certain angle.

"The whole year is exactly 360 degrees retrograde for one week.

"Since the false moon is going retrograde, you can't let the false moon follow the earth from west to east.

"In the process of false moon deployment, the power provided by the rocket should be used to offset the eastward bias force brought from the ground.

"The higher the latitude, the slower the earth moves, and the less speed the rocket needs to counteract.

"So from this point of view, the ideal launch point is the pole, which can be considered relatively stationary.

"However, compared to the equatorial region, the polar environment is even harsher and it is almost impossible for humans to survive.

"So we had to settle for the next best thing, and choose a place that is as close to the pole as possible and the climate is as warm as possible.

"The most suitable places for the minister are the islands in the southern part of the province of Laga (Alaska), the northwestern part of North Yinzhou.

"Due to the influence of the tributaries of the warm current of the Beida Ming Ocean, there are still islands with an average low temperature of minus two or three degrees in the coldest month in winter and an average high temperature of minus two or three degrees in the day at a local latitude of nearly 60 degrees.

"The southern part of the region is also a vast ocean, which is equally convenient for observation and rocket falls.

"The downside is that it's still very far from home.

"It's nearly 5,000 kilometers from Hokkaido, and it's nearly 8,000 kilometers from Yingtianfu.

"If you want to consider launching locally, at the same time you need the surrounding environment to be suitable.

"You can only choose between the vicinity of Nuergandusi and Kuwu Island, where there is a train in the northern part of the Xianbei Wasteland, and the southern part of the Kuril Islands in northeastern Hokkaido.

"Both Nuergandusi and Kuwu Island are close to the sea, but the local seaports are frozen for a long time in winter.

"The northern part of the Xianbei Wasteland is closer to the North Pole and more inhospitable and inhospitable, but the local environment is also very harsh, and rail transportation will limit the size of the rockets.

"The Kuril Islands are oceanic to the north and south, but the local latitude is only forty degrees.

"The minister's suggestion is either to choose the province of Latin America, or to be in the Kuril Islands."

Zhu Jingyuan listened to Qi Yanhuai's analysis, and many things in his mind came out.

To the north of Lucia proper, there is a very famous rocket launch site, the Plesetsk Cosmodrome.

It is located in the northernmost province of the core of Lucia proper, Arkhangelsk Oblast, and was originally under the jurisdiction of Novaya Zemlya of Great Ivan.

The launch base has reached the sixty-third parallel north latitude.

It was a secret launch base, which was built in 1957, but its existence was not officially recognized until 1983.

The reason is that the rocket and satellite orbit data of Red Lucia do not match the calculations of Europeans and Americans.

It is the most important experimental and launch base in Lucia itself.

The province of Lajia suggested by Qi Yanhuai is also the Alaska of Zhu Jingyuan's previous life.

The Americans built a launch base in Alaska.

Located on the eastern part of the Aleutian Peninsula, in the southern part of the Alaska landmass, on an island called Kodiak.

The name of the launch center seems to be "Pacific Space Center".

It's just that Zhu Jingyuan doesn't seem to have used it a few times in his memory, and it is completely different from Lucia's Plesetsk base status.

Probably because Alaska is close to their longtime nemesis, Lucy Asia.

The place where the United States launched its sun-synchronous satellite was Vandenberg Air Force Base on the west coast at the southern tip of California.

The status of Vandenberg airbase corresponds to Plesetsk in Lucia.

Originally it was the place where the United States tested ballistic missiles.

And the latitude of Vandenberg seems to have reached thirty-four degrees north latitude.

It is only six degrees away from Cape Canaveral in the southeast.

The reason why the Americans chose this place may simply be that its south is the ocean.

While Zhu Jingyuan was thinking about it in his heart, he also followed the direction proposed by Qi Yanhuai and made a tour on the map.

According to the standard of latitude as high as possible, the climate is also as warm as possible.

The place with the best conditions seems to be Iceland.

The latitude here is seven or eight degrees higher than that of Kodiak, and the Arctic Circle is already attached to the north.

But the temperature should be a little better on Kodiak Island.

Because the North Atlantic Warm Current is a bit stronger than the Alaskan Warm Current.

Moreover, Iceland is surrounded by oceans in both north and south, which is convenient for the deployment of ships to observe and the fall of rockets.

Although the climate in northern Norway is similar to Iceland's, it is deeper into the Arctic Circle, with latitudes close to 70 degrees, and the average winter temperature in coastal areas is not particularly low.

However, Norway is inland to the south and the Arctic Ocean to the north, which is inconvenient to observe on either side.

It's just that neither Norway nor Iceland is too far away from the Ming Dynasty and is not under the jurisdiction of the Ming court.

However, Kodiak Island is not much worse than Iceland.

As for those places in the northern part of the Xianbei Wasteland, just think about it to know how terrible the winter is.

Zhu Jingyuan thought about it for a while, and looked at the people from the Ministry of Construction and the Royal Engineering Company next to him:

"You probably know what's going on, I'll tell you what you're going to do.

"The Ministry of Construction and the Royal Engineering Company respectively cooperated with Qin Tianjian to make a relatively formal project site selection plan.

"In accordance with the requirements of the Qintian Supervision Column, several groups of people were arranged to go to the Ningbo-Zhoushan area, the vicinity of the mouth around the Lion City, the eastern area of Medan, the eastern area of Mozhou, the southern islands of Latin America Province, and the southern area of the Kuril Islands to conduct on-the-spot exploration and summarize the situation.

"Qin Tianjian will organize people to sort out your current theories about false moons, and work with the Ministry of Industry and the Ministry of Ordnance to make a formal and complete comparison and calculation.

"The differences in geographical environment between different regions, the advantages and disadvantages of rocket launches, and the benefits that latitude differences can bring are all studied as much as possible.

"Then we'll meet again and decide where to build the launch site based on the results of your exploration and calculations."