But no one can be sure until the rock is watched a bit longer, allowing more precise calculations of its path.

"I haven't done any precise calculations yet, naturally," the chief scientist said.

But many scientists and engineers who depend on precise calculations are concerned.

That allows more precise calculations but, again, costs heavily in computer time.

A precise calculation of the conversion cost is a demanding task.

The statements are not specific enough to permit precise calculations.

Without any precise calculations let us assume this is £8 a week.

He waited until the creature was nearly on him, a precise calculation.

This is the most precise calculation produced so far.

If so, a far more precise orbital calculation can then be made.