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Tilt Model of the Earth

  1. Sep 26, 2009 #1
    Earth has a tilt to it about 23.439281° to -23.439281° from the Tropic of Cancer to the Tropic of Capricorn. The tilt faces the sun at differrent points from 23.439281° to -23.439281° creating the seasons etc. I have written a preliminary MatLab program showing the 3D Earth Equitorial Model plus some rings at the equator and at the tilt maxima and minima. What I need is some help with the trigonomic equation of the 3D loop ring that connects the two tilt maxima and minima thru the origin. Here is an example of what I have. Center loop:

    x = r * cos(theta) * sin(phi)
    y = r * sin(theta) * sin(phi)
    z = r * cos(phi)

    where r = 6378100, phi = 90 and theta = 0 - 360

    Attached Files:

    Last edited: Sep 26, 2009
  2. jcsd
  3. Oct 3, 2009 #2
    I have had nothing but trouble finding a set of equations to calculate the Tilt of the Earth trigonometrically for a theta (0 to 2pi) and a given Obliquity = 23.439281° (for Earth). Please disregard the MatLab program above. Any suggestions would be much appreciated.
    Last edited: Oct 3, 2009
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