How does one observe the Nakshatra Year since it is based on the revolution of the earth on its axis one time to make one Nakshatra day? Does one simply observe the stars from one point to the next point to calculate its day?
Or, does one observe a star (nakshatra) to rise on the horizon?
The other years are observational, except for the sidereal solar year of course.
you can observe it below the polar circles by watching the rising of a star on the horizon. Beyond the polar circles you need to watch an object, such as the big dipper, revolve once around the pole, which is easy to do in the north as we have a pole star in the north.
Yes, its true, those stars can't have anything to do with the Sun from a visual observational point of view.