Talk:Three-dimensional rotation operator

Merge

It appears that most of the information from eigenvector slew has been copied to rotation operator (vector space). Perhaps the merge should be completed. — Arthur Rubin (talk) 13:37, 2 August 2008 (UTC)[reply]

Spacecraft engineers are in general no mathematicians and they do not want the terminology of linear algebra. Just the computations that should be made presented in the simplest and most direct way that is possible! Without unnecessary mathematical terms!

Stamcose (talk) 16:21, 2 August 2008 (UTC)[reply]

Personally, I'd rather that the the matrix conversion from a b c to d e f coordinate systems not be in any Wikipedia article as other than a reference to coordinate transformations. We can't always get what we want, and ignoring the fact that it is simple linear algebra should not be allowed. — Arthur Rubin (talk) 07:01, 3 August 2008 (UTC)[reply]

I'm curious what the "optimum" solution is for changing the attitude of a spin-stabilized spacecraft. The calculations you've so far presented don't approach an attack on that problem. I could write it up as a calculus of variations problem, but I don't know if I can solve it. — Arthur Rubin (talk) 07:06, 3 August 2008 (UTC)[reply]

That is in fact simple. For a spin stabilized spacecraft the precession is a continous change in angular momentum obtained by the application of a torque. The quickest and most economical is to move along a great circle. Similar to the travel on the surface of a sphere (for example the Earth)

Stamcose (talk) 20:10, 6 August 2008 (UTC)[reply]

Notation question

What does this notation mean? That is, what is the meaning of there being two elements separated by a vertical bar, inside angle brackets?

$\langle {\hat {e}}_{1}|\mathbf {A} {\hat {e}}_{1}\rangle$

Could there be a pointer to where the notation is explained? Gwideman (talk) 20:18, 11 March 2013 (UTC)[reply]