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First, ignore what Wikipedia claims about attitude indicators. It shows a diagram of the inside of an airplane attitude indicator. I am not inlining this image because -- although some airplanes may use such an indicator -- it is completely wrong about spacecraft attitude indicators. Let's look at what is displayed on a spacecraft attitude indicator. The ...


Ok so to answer my own question (turns out I just needed to do a little more reading up): The reference plane for the Azimuth is based on True North with its 0 degree starting at the Meridian line and increasing clockwise 360 degrees until once again reaching the meridian. It is also possible to use True South to orientate, but then the Azimuth increases ...


Most small pressure-fed engines have some sort of positive expulsion device, it most frequently takes the form of a very flexible diaphragm, or bellow, or plastic bladder trapping the entirety of the propellant that's still in the tank, completely separating them from the pressurizing gas.


You are describing the Local Vertical Local Horizontal (LVLH) frame of reference. It is used to describe the orientation of the spacecraft in relation to the Earth's surface. For example, if you wished to point an instrument at the point on the Earth directly below the spacecraft, the craft would fly in a constant LVLH attitude. But its inertial attitude ...

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