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## Main Question or Discussion Point

Hi,

If at a particular time, I have the r distance from the Sun to Earth, the value of the velocity of Earth, and the angle between the velocity vector and the r vector, how can I calculate the force that Earth has regarding the tangent? Suppose I wanted to go againts the movement of the Earth. Which force should I go against and how do I calculate it?

Kind regards,

Kepler

If at a particular time, I have the r distance from the Sun to Earth, the value of the velocity of Earth, and the angle between the velocity vector and the r vector, how can I calculate the force that Earth has regarding the tangent? Suppose I wanted to go againts the movement of the Earth. Which force should I go against and how do I calculate it?

Kind regards,

Kepler