In Working Model, the Sun, a
simple
circle, was placed at
the origin on the XY-graph. It was given
the proper mass. Then, the Earth was
created, as another circle, and also given the proper mass, and placed
on the
X-axis at the proper distance. Then,
the Earth was given the right
velocity, but only in the Y-direction, as this
is the tangential velocity of the Earth, and therefore
should be perpendicular to the force of gravity of the Sun. Then the simulation was run with the tracking
on in order to see the path. To see what
would happen if the Earth was closer to the Sun or further away, but
still with
the same velocity, the Earth was dragged around the X-axis. The simulation was run again, with tracking
so that the path would be visible.
