I have a little trouble with positional astronomy so I wanted to clarify a few things to get my understanding right. The imaginary celestial poles are located directly above (or below) the poles of the Earth, right? And the Zenith is the position in the sky that a person would look if one was looking straight up from local position. So, if a person were at either pole of the Earth and looking straight up, that would be a celestial pole? I have not clearly understood the concepts of azimuth, declination (what is declination?) and the zenith and how to use them to find the position of a star in the night sky at a given time of the year from a particular location on Earth. I know that sidereal time and local time are also used in this case. Could someone explain this?