Their life cycles are bound to the planetary rotation.

I recommend we do half a planetary rotation.

Such masers would be highly variable due to planetary rotation (10-hour period for Jovian planets).

It was as good a choice as any, since planetary rotation didn't affect the bright skies and me personnel weren't expected to go outside often anyway.

Quite likely it was in motion to remain ahead of planetary rotation.

Considering the planetary rotation and the current angle of the sun, we have approximately 5.62 hours, standard, of usable light remaining.

"Completion of the shield is estimated in point zero six five planetary rotations."

The masculine voice said, "Not quite a planetary rotation.

A settlement, thirty planetary rotations in residence, the formal claims-all done.

At the equator winds are retrograde, which means that they blow in the reverse direction to the planetary rotation.