1. 1 Pertubations by the Sun + Moon (Seeber, 3.2.3) Earth, Sun, Moon regarded as point-masses.

2. 2 Acceleration relative to Earth:.

3. 3 Perturbing equations.

4. 4 Solid Earth + Ocean Tides(Seeber, 3.2.3.2).Satellite (LAGEOS) used to determine Earth Tides

5. 5 Ocean tides.

6. 6 Atmopheric drag, Seeber 3.2.3.3. Satellite “geometry” (box or sphere …) Satellite velocity, energy loss per s is dot-product of velocity vector and external forces. Direction of forces Air temperature and density, composition.

7. 7 Drag-equation.

8. 8 Exercise.

9. 9 Density.

10. 10 Solar pressure (Seeber, 3.2.3.4) Direct Indirect (albedo) Force proportional to O (Area), C r reflectivity Inversely proportional to velocity of light, mass and square of distance (AU) to Sun:

11. 11 Solar pressure.

12. 12 Relativistic effects.

13. 13 Height and pertubation

14. 14 GPS.

15. 15 GPS.