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No. A day is our word for a rotation. The rotation exists, it's effects are manifested on the planet, whether we call it a day or not. 'A day' is our description of the observation of the sun rising and setting. There are seasons, whether we measure them or not, the Earth moves, both on its axis...

Sorry, don't agree. You are constructing artificial constructs (100 revolutions) into other artificial units (1 day). Our understanding of days and years isn't based on a artificial construct - it's based on the movement of celestial bodies. If you stood on Mars, there would be what we call...

Nibs, he's got you bang to rights, I really can't see what you're getting at. This is wrong. There is no other way to describe it. For as long as humans have been on this earth there have been 365 complete revolutions of the Earth in the time it takes the Earth to travel around the sun. We did...

Or alternatively 365.24 appearances of the sun, or revolutions of the earth on its axis. As Triggaaar pointed out, there are definite celestial forces which determine the length of some events, and we can use one set of events (e.g. one revolution of the earth on its axis) to define others...