The Earth as a Planet
I. Shape  and Size of the Earth
II. Diameter
III. Circumference
IV. Ancient Earth Measurements
V. Movements of the Earth
    A. Galactic
    B. Rotation
    C. Revolution
VI. The Tilt of the Earth
VII. Long Term Changes in Postion
    A. Changes in Axial Tilt
    B. Precession of the Equinoxes
    C. Eccentricity of Orbit