In that case, it would show the Sun the same face all the time. In parts of the Earth it would be day all the time, in other parts it would be night all the time.
Once a day throughout its history.
The Earth's sidereal day.
The Earth takes 23h56m to rotate once around its axis.
The planet Earth rotates on its axis exactly once per day.
Mercury rotates once in about 58.6 Earth days.
24 hours
No, only once. Exactly.
It takes 24 hours (one tropical day) for the Earth to rotate once about its axis relative to the Sun. It takes about 23 hour and 56 minutes (one sidereal day) for the Earth to rotate once about its axis relative to distant stars.
50 Earth Years and 1059 alien years.
Earth's moon does rotate on it's axis but it does it once each orbit of the Earth: every 27.3 days .
The Earth rotating once on it's axis. It takes 24 hours to rotate once on Earth, but each planet varies in time.
A sidereal day.