My two tricks: satellite dishes point south†, more or less, and Christian churches are usually built with the altar pointing east.

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†In the northern hemisphere.

Satellite dishes point south in the northern hemisphere, right? Since they orbit over the equator.

I've never found this practically useful, because the one city where I've wandered a lot and saw a lot of satellite dishes is Philadelphia, which has a grid layout. But I do recall noticing it.

Yes, of course! Sorry for that. Being European I sometimes envy not only those neat grid layouts, but also the numbered streets, because from the numbering you can infer the position of the target. But "Saint Joseph's street" could be at the next corner or on the other side of town, you cannot know...

Moss grows on the north side of satellite dishes. In the northern hemisphere.

Remember, you can also go into the nearest pub and flush a toilet to determine which hemisphere you're in.