You’ve got a virgin universe, complete with all fields, but no matter at all except for one star and a clock that is running on the star’s surface. Of course that means that nowhere in your universe is space a flat, perfect, cubic coordinate system because the star is bending it somewhat, everywhere. Even very very far away from the star space is still curved by the star’s mass even though the distortion is so slight that only God can see it.

At time t=0, you will a planet into existence a distance d away from the star. It’s literal new mass in the universe that wasn’t there before, and you poofed it into existence. Due to gravity, that planet will be attracted to the star and they’ll move toward each other.

Question is: What time does the clock on the star’s surface read upon the very instant at which the planet begins to move?