How to visualize the rotation of the Earth around the Sun?

Question

C++ / C#

I don't understand how can I find direction F2?
Further vectors can be added.
F2 > 0.
Take random? Or directed against the force of gravity (then F3 = 0)?

Answer 1

1) Draw a point (Earth) that rotates in a circle around another point (Sun).
2) Use an ellipse instead of a circle.
3) Find a mathematical model of the earth on the Internet and draw an orbit.
ps
According to your drawing, only F1 acts on the Earth. The rest of the forces are not clear where.