640px? So small.. like this? Northern horizon in Paris, 10:00 pm, October 12.
http://commons.wikimedia.org/wiki/Fi...king_North.jpg
This is just a small map, I hope this is good for you. If you need more details, please tell me. Use the stars Merach and Dubhe and prolungate the line that they draw for about 5 time, you will easy find Polaris, it's a lone star.