Another year is here

Happy New Year everyone!
But have you asked yourself what's so special about new year? Why is everyone celebrating it? What is everyone actually celebrating? The end of the previous year and the start of the next one you say? So why is this particular point in the Earth' path along the Sun so special? Because that's just what it is, an artificially decided, more or less fixed point in the Earth's orbit. It's impossible to decide where an ellipse starts.