Any developments in orbit would have little effect on his end of operations, unless time or circumstances had necessitated a change in plans.

These arrangements were generally adhered to, unless circumstances necessitated a change, e.g. the death of the promised man.

Recently I have wondered what circumstance necessitated that you should become what you are.

My circumstances do not necessitate flight, unlike every generation of my family before me as well as everyone else in the waiting room.

The circumstances necessitated the holding of an inquest, the verdict being that of accidental death.

We do indeed have it that a causal circumstance necessitated its effect.

In believing this we believe that some causal circumstance necessitated the temperature of his knee.

On occasion, Jeeves has been known to take the place of his uncle when circumstances necessitate his absence.

"If circumstances necessitate being outdoors in unseemly heat, we will have staffers with large fans."

Some circumstances however necessitate a shift from superficial to extensive processing.