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"   We often say that the mouth vastness of the universe, but you really can not understand how it is huge, vast, than you can imagine and then take on the biggest one are more than hundreds of millions of times. Ah, sometimes you feel so right up to the pharmacy Nima really very far, but compared to the boundaries of the universe, to be honest it can not match even drop in the ocean.
- Douglas Adams , galaxy ride off guide

NASA plans moon in the process, they soon realized that carry all the fuel return mission to the moon is completely impossible. The spacecraft will become very heavy, but the weight is actually a lot for a landing mission is useless, would greatly increase the difficulty of landing. To solve this problem, they decided to adopt this strategy: After reaching lunar orbit, lunar module will be separated from the command module, the former will independently moon mission, then return to orbit rendezvous with the command module docking. However, this requires in-orbit rendezvous and docking - this is a new attempt, has not previously been. No one knows that it is not feasible. If it fails, the players will be trapped in the moon on the moon, lost the opportunity to return to Earth.
So they decide is best in the relative safety of Earth orbit spacecraft rendezvous and docking exercises, and then in a similar lunar orbit flight. This is the "Gemini (Gemini)" program was born in mind.
In this tutorial, we will reproduce the "Gemini" 6A and flying on the 7th, which is the human space flight in the history of the first manned spacecraft orbit docking. We will conduct a EVA - a Kerbal extravehicular astronauts will use jetpack flying around in a spaceship, and then return to the ship.

"Gemini" spacecraft can carry two crew, so we use Mk2 type lander as the command module. And real "Gemini" program, our spacecraft in orbit flight will rely only monopropellant engines. This is why the spacecraft is loaded with great monopropellant fuel tanks.

Titan II GLV
This time we will join in the spacecraft SAS module , which can greatly reduce the difficulty of launching and docking. Note that here we did not use advanced SAS modules . Because it will make use of the ASAS module open roll thrust vector control, which will bring a small amount of lateral acceleration. This is our attempt to harm precision docking operation is great.
Here is the launch vehicle: Soviet rocket design ideas for the initial design of the R-7 launch vehicle and keep adding more stages to increase the payload capacity, while Americans believe in design philosophy is "bigger is better" They try to improve the quality of each stage rocket. Titan II GLV launch vehicle embodies this concept ( G Emini L aunch V ehicle). It is only two, but each one is very large. Accordingly, we will choose Rockomax fuel tanks, Rockomax "mainsail (mainsail)" engine and "Captain (skipper)" type engines.
Rockomax "mainsail (mainsail)" KSP engine is the largest engine thrust, up to seven LV-T30 engine thrust sum. Its fuel consumption is slightly larger than seven LV-T30 engine, but on the other hand the quality of its own much less. Both offset. The "captain (skipper)" engine thrust than the "mainsail (mainsail)" type lower (roughly equivalent to three LV-T30 engine), but it is lighter, less fuel consumption - as the Titan rocket secondary engine. So it is very suitable for secondary rockets. [1]
Task load level
1x Clamp-O-Tron Docking Port
1x SAS Module
4x RV-105 RCS Thruster Block (spaceship top)
1x Rockomax Brand Adapter
2x Mk2-R Radial-Mount Parachute
1x Mk2 Lander-can
1x FL-R1 RCS Fuel Tank
4x RV-105 RCS Thruster Block (spaceship at the bottom)
Secondary rocket
1x Rockomax Brand Decoupler
2x Rockomax X200-32 Fuel Tank
1x Rockomax "Skipper" Liquid Engine
The first stage rocket
1x Rockomax Brand Decoupler
3x Rockomax X200-32 Fuel Tank
1x Rockomax "Mainsail" Liquid Engine
You might ask why we do not have Jumbo-64 fuel tanks to replace the X200-32. One reason is that cabin Jumbo fuel rocket will bring some instability factors, we need to add support to improve stability. There is a strange reason: Jumbo fuel tanks installed in the bottom of the "mainsail (mainsail)" engine at full thrust will quickly overheat, but installed in the bottom two sections feature the same type of fuel tanks X200-32 is but did not This problem. I do not know what the reason is.
Task stage

Prior to launch, the two spacecraft were to give the best name for easy identification. If you like to reproduce the history, you can put first spacecraft called "Gemini" on the 7th, the second ship called the "Gemini" 6A No. (Why backwards ID? That is a long story ......).
Launch - "Gemini" on the 7th
The first carrier rocket will "Gemini" 7 launch to 100 km high orbit. At this stage you should have this very much at home.
Try to adjust the orbit to nearly perfect circle. Track every meter distance point difference will increase the difficulty of rendezvous, so here it made the greatest efforts possible. After completing the turn off the engine, press Esc to return to the first launch Space Center in preparation for the next.
Launch - "Gemini" 6A No.
Adjustments to the track near point near point coincides with the orbit of another spacecraft
Now we are the same rocket launch second gold.
Our goal is to get as close as the two spacecraft, so before ignition, attention should first spacecraft is best to way to the launch point within two minutes of launch time.
Then follow the same steps launch. And the first spacecraft to ensure the same track near point height. And then, like a spaceship, try to adjust perfectly circular orbit.
Align orbital correction
Tilt correction
Now two spacecraft are separated and secondary rockets. After all of the orbital maneuvering should only use monopropellant thrusters to proceed. Press H and N keys can accelerate and decelerate, rather than resizing thrust with shift and ctrl key. This way you can be more precise thrust vector control - For this task, the accuracy will undoubtedly be ranked first.
Currently, you are in a circular orbit spacecraft should be the same height, but the orbital inclination may have some differences. To correct the inclination of the difference, the spacecraft is set to target. Track Perspective accordingly marked two points on the track: "ascending node (ascending node)" and "descending node (descending node)". It is the intersection point of the two spacecraft their orbits. In advance of these points north or south, you can reduce the difference between the target orbit with inclination, and eventually the two tracks completely overlap, as orbital flight 101 as described in the tutorial.
Conduct EVA
In orbit extravehicular space walk
Before starting the docking, we want to try to drill spacewalk mission in space, a Kerbal astronauts will use jet propulsion backpack extravehicular space walk.
First, make sure the spacecraft is not in the rotation state. If spacewalk in this state is tantamount to suicide.
Click on an astronaut's picture, select "EVA", and immediately press the F key to grab the hatch near the gangway. Your Kerbal astronauts in the spacecraft will remain close to the surface. After a few moments peace of mind you can let go. Kerbal astronauts will slowly drifting away from the spacecraft. If you want to return, press the R key to activate the spacewalk jetpack. You can use the A, W, S, D, Q, E, Ctrl, and Shift to control the direction and speed of flying astronauts. Use it to return to the door and press the F key to grab the ramp. After practice almost, you can do some more exciting action, such as around a week and then return to the spacecraft.
But remember, jetpack fuel is limited! Click astronauts can determine the amount of fuel remaining.
If you're not careful unable to return the spacecraft ran out of fuel, you can also switch to the control of the spacecraft, and try to close the astronaut rescue. If this really sacrificed astronaut, this is a tragedy, but it does not mean the end of the task - in fact, you only need each spacecraft astronauts to complete a task.
Rendezvous with another spacecraft
After completing the exercises spacewalk, now with another spacecraft rendezvous time.
Click another spacecraft orbit, the target set for the spacecraft. Be careful not to mistakenly chosen the wreckage of the spacecraft launch vehicles, spacecraft because of the track and it runs very similar.
Two identical spacecraft's orbit, but the distance of about a few hundred kilometers away. How to solve this problem? You should remember this rule right, low orbital altitude of an object above the high running speed to orbital altitude of the object. This means that if your ship forward position, you can increase the orbital altitude. If the spacecraft behind, you will need to enter a low orbit. After the two spacecraft close to each other, then back to the original track, while ensuring that overlap between the two tracks. Your goal is to distance the two spacecraft to within 5 km of adjustment. This operation skill full, you will most likely need to go through several attempts to achieve.
During this maneuver, to observe the remaining amount of monopropellant. If the amount of fuel less than 100, double-click in the perspective of the target track to switch to another ship, and then make the appropriate maneuver. If the amount of fuel two spacecraft are below 100, you can basically think this mission ended in failure. Your next task is to return with the remaining propellant into orbit, at least allow the safe return of the astronauts.
Docking maneuver
Once the target distance is less than 10 km, the ball will automatically switch from navigation "track" mode to the "target" mode. The following information is the actual meaning of the display in this mode:
Velocity (speed) indicates the target's relative speed - what kind of speed toward and away from the target ;
Yellow flag indicates the relative speed increase and decrease the acceleration direction;
Purple flag indicates close and off target acceleration direction;
Killing speed
First on the yellow sign, turn thrust adjusting the relative speed of 0.0 m / s. At this point you are in parallel with the target spacecraft flying status. Then turn to align purple logo, thrust slowly open and close to the target spacecraft. Do not accelerate too fast - please be patient. Before the collision with the target occurs on the yellow flag reverse thrust spacecraft reduce the relative velocity is zero. Repeat this process until the relative distance is reduced to a few meters to tens of meters, while the relative velocity is zero.
Just around the corner
But now you are separated from one arm of the target, but it's probably not appropriate docking hatch position. You can fly around and close to the motor from another point of view, but there is an easier way. Take your spaceship on the interface at the target, activate SAS, and then track the map angle switching control another spacecraft.
Facing the target
Now you just need to turn to the second spacecraft aligned first spacecraft, slightly accelerated close, so close to the docking hatch gradually until they complete the interconnection locked.
Congratulations, docking mission fulfilled!
Butt flight
Exchanging fluids
Well, the spacecraft has docked. What does this mean? Even as one of the two spacecraft together in flight. The direction of rotation of the spacecraft, you notice two spacecraft attitude adjustment engine will work simultaneously on a common maneuver the spacecraft to make corresponding adjustments, rather than their own ways. If the spacecraft is mounted rocket engine, the effect is the same.
Another interesting thing is that you can now exchange of fuel and other resources. Right-click on a fuel tank, hold down Alt, then right-click on another. You can put fuel from a fuel tank transported to another go. If a spacecraft's monopropellant margin is relatively low, you can be certain to add.
As 0.19.1.54, astronauts can not be transferred through the docking hatch. Currently the only viable approach is to allow the transfer of astronauts to perform EVA, spacewalk by another spacecraft arrives (technically, as long as you get close enough by the relative velocity is zero on it, no need to butt can also EVA crew transfer).
Return Kerbin
Right-click on a docking ring hatch, select the "separation (undock)", two independent spacecraft re-flight. First spacecraft with the remaining monopropellant return (remember, when the yellow flag indicates or relative speed, not track speed!), And complete the re-entry and landing.
Then, let the second spacecraft landed at.
Perhaps you can try to make the two spacecraft docked state to decelerate reentry flight, separated before entering the atmosphere, and their parachute landing.
Remain docked with the landing seemed full of temptation, but I tried again later abandoned, spacecraft disintegrated in the fall, the crew were all killed. If you want to try, then you hope for the best of it.
The next step?

Now you have mastered an important capability - how to get two in-orbit spacecraft rendezvous and docking. This capability is very important for landing missions to other planets. Every launch into orbit payload weight is limited. But with docking, you can build a large spaceship, launched just need parts individually and then assembled in orbit docking can. Many people say it is impossible astronaut from Eve lifted off the surface of return? Prove them wrong, right - as long as there is sufficient hardware, nothing is impossible!
But now that there is a certain distance from the target. We first focus on the simpler tasks: lunar !
Notes

↑ 0.20.2 build a rocket in accordance with the program, there will be a significant jitter found between primary and secondary rocket has been rocking the flight anomaly unstable. Each level requires two Rockomax X200-32 Fuel Tank ribs join the EAS-4_Strut_Connector .