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

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Presentation transcript:

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

2 Acceleration relative to Earth:.

3 Perturbing equations.

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

5 Ocean tides.

6 Atmopheric drag, Seeber 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 Drag-equation.

8 Exercise.

9 Density.

10 Solar pressure (Seeber, ) 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 Solar pressure.

12 Relativistic effects.

13 Height and pertubation

14 GPS.

15 GPS.