Thanks for all the replies everyone.
Just one question for DFSpilot, how do you know that london heathrow is in the northern hemisphere? how do you determine which one is northern and which one is in the southern hemisphere?...
I got the whole thing till the end... sorry, do you determine it by the equator?, as if its about the equator then it is in the northern hemisphere then when it is below then it would be in the southern hemisphere? or is it something else?.
Thanks
Brian304