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    Re: Spacecraft Attitude Determination and Control
    From: Robert Eno
    Date: 2003 Feb 13, 20:20 -0500

    Ok, I have to ask (maybe I will regret it but I have to ask):
    What is a quaternion?
    ----- Original Message -----
    From: Dan Allen 
    Sent: Thursday, February 13, 2003 5:54 PM
    Subject: Spacecraft Attitude Determination and Control
    > On Wednesday, February 12, 2003, at 06:16 PM, Robert Eno wrote:
    > > The United States Naval Academy produced a book called: "Space
    > > Navigation
    > > Handbook" in about 1961.
    > There is a more modern treatment done in a work called "Spacecraft
    > Attitude Determination and Control", edited by James R. Wertz,
    > published by Reidel.  Mine is a 1978 edition; a new edition came out
    > last month - for $152!  Ouch.  I am not sure how revised the new 2003
    > edition is.
    > This work goes off more into Euler angles and using quaternions and
    > such, so it is more mechanics than navigation, but there is good
    > material on sun sensors, gyroscopes and spherical geometry.  Lots of
    > mathematical equations, good technical drawings.
    > If you can find a used copy of an older paperback version it may be
    > work picking up.  Wertz has written several other space/math/physics
    > books as well.  Search Amazon for details...
    > Dan

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