It depends on which hemisphere you live in. For instance, if you're in Australia it would need to point north, but in the US or Europe it should aim to the south because the sun will always be in the southern sky. But again, in the Southern hemisphere it will be opposite.
Then again, if you live right on the equator..it wouldn't make much difference. Either way, the sun rizes in the east and sets in the west, but typically for Americans the sun will always be in the southern sky 24/7/365