Guys, I have been looking for the boundary conditions for the problem of the three bodies applied to the system composed by the sun, the earth and the moon. I encountered a paper with the following figures, which refer to the so called Euler's solution:
For t=0
Xsun=0 Ysun=0
Xearth=1.0167122AMU Yearth=0 Uearth=0 Vearth=6.138542 AMU/year
Xmoon=1.019253AMU Ymoon=0 Umoon=0.002 AMU/year Vmoon=5.918001 AMU/year
Practically, the model assumes that the earth lies at the top of the major axis of its ecllipse, the sun lies at the distant focus of the ellipse and the moon lies 3.8x10^8 m away from earth on the exterior of its orbit.
Now, as I am totally unfamiliar with astronomy and the likes, can anyone tell me if these figures are accurate and by the way explain to me how can the velocity of the moon have a horizontal component at this point, even if it is that small? Isn't the moon supposed to be revolving in a circle around earth? Or is this motion apparent only on a micro-climax engulfing just the earth and the moon?




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