Greetings. I have a little question. Today my teacher was trying to explain what a meridian circle is. Anyway ... i asked him "What if the observer is on one of the poles, his Nezir will be the same as the Celestial pole, so, he will not have any Meridian Circle at that point". He answered "No, he will still have a meridian circle" His explaination says that a person always have four direction; north, south, east and west even if that person is standing exactly on the north pole, and therefore the meridian circle for such a person can be defined using the north point of his horizon circle. I tried to tell him that a person standing on the north pole won't have those four directions, since he will be moving towards south no matter what direction he takes, but he disagreed. So, can anyone help me out ? Thanks in advance.