Suppose youa re somewhere in the Atlantic ocean. YOu see Polaris at 52 degrees above the horizon. You were told that a certain star is on the Prime Medidian at midnight Greenwich mean time. The star is on your meridian at 4 am greenwich mean time. What is the latitude and longitude?

This sounds like a homework problem to me, so please don't just type the question in and expect someone to do your homework for you. You should make an attempt and solving it yourself, and then if you have difficulty show us how far you got.

I will give you one hint: given that Polaris is commonly known as the North Star, and is positioned almost exactly above the north pole, you can probably imagine that if you were standing at the north pole (+90 degrees latitude) it would appear directly overhead - that is, at 90 degrees altitude in the sky. And if you are standing at the equator (0 degrees latitude), Polaris would be precisely at the horizon (0 degrees altitude). Do you see the relationship between your latitude and how far above the horizon Polaris appears?