We did not want to take the chance of wide orbit.

Each form is associated with a specific type of orbit.

"I thought for a while you were going to knock us right out of orbit."

"Now, what kind of orbit do you want them to stay in?"

The problem was to guess the altitude of the orbit.

No information is available about the shape of the planet's orbit.

Analysis of its unusual orbit shows that it may come very close to Earth soon.

We can talk about how much of the orbit is in the horizontal plane.

At one end of the orbit, comets pass near the sun, perhaps only a few million miles away.

From this position change, and the known size of the Earth's orbit, the distance to the star could be estimated.