As the sunlight cut through the atmospheric dust and ash, we read:

Genesis 1:3-5  "And God said, Let there be light, and there was light.  And God saw the light that it was good: and God divided the light from the darkness.  And God called the light Day and the darkness he called Night.  And the evening and morning were the first day."

Sunlight, and darkness.  That means there was rotation.  Did rotation begin before this moment?  Did the earth rotate in twenty-four hours?  The Bible doesn't say.  Don't get into an argument about how fast, or how slow rotation was.  It was simply rotation.  There was night, and there was day.

Catastrophic events on earth can change the rotation and tilt of the earth.  We have seen that happen a number of times when volcanos and earthquakes occur.  A recent earthquake in South America affected rotation and the "time" it takes for a rotation.

Think what an asteroid would do.

Where were the North and South poles?  There is adequate evidence that our even our North and South poles have shifted.

But rotation settled in, and earthquakes, tsunamis, and volcanos changed the topography of the world.