Subject: Is their any way to tell time using the stars?

I just started working in a planetarium and a lady asked me if I knew 
how to tell time using the stars. She said that she used to know how 
to do it but forgot.  She remembered that it had something to so with 
angle of displacement of an imaginary line that went through Duhbe and 
Merak (The Big Dipper stars that point to polaris) and the line of the 
meridian.  Do you know what she was talking about, or any other ways 
to tell time with the stars.  Thanks in advance
Jacob
jtindall@wvi.com

Re: Is their any way to tell time using the stars?