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I would like to see the resemblance between planet Earth and a spherical top. I draw here the x-convention Euler angles as I know them: 24 hours to complete one complete one revolution around it's ownz'axes. And the 23.5° Earth axes revolves around the "sun'szaxes" - the line perpendicular to the plane where the Earth orbit's the sun.

So where is the nutation? does the 23.5° ever change?

Thanks.

http://img214.imageshack.us/img214/5059/earthorbit3nb.png [Broken]

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# Homework Help: Earth's Euler angles - nutation?

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