Although I don't technically place the concrete, I am usually involved as the Owner's rep to make sure that the right, in-spec concrete is placed - and placed correctly. Having early morning pours helps with weather (not too hot, windy) and with supply (no one else is pouring, so there is not a competition for concrete).
Beginning of the pour - Concrete Pump Boom from the right hand side.
Striking off the concrete.
Sun is coming up.
Nearing the end - sun up higher.
Bull Floating to make the floor very smooth.