If the sky is relatively clear tonight, consider going out and watching the ISS fly by at 6:23 PM. 6 Minute Window.

If you have never watched the ISS fly over, you've been missing an awe-inspiring experience!

Get somewhere with a clear view of the sky, especially toward the northwest. At 6:23 PM, watch the horizon, facing northwest, and you'll see a what looks like a very bright star appear, climbing rapidly. It'll cross near the middle of the sky and disappear 6 minutes later, in the southeast sky.

Keep in mind that there are SEVEN humans on that thing. They're flying around planet earth at 17,130 MPH! Four of the astronauts are from the USA, and one is from HOUSTON.

Another fun thing to do is to get someone on the phone that's far away, and watch the ISS together. It brings a connection that's hard to describe.

Edit/Update: By far the coolest thing I've seen in comments so far (thanks, /u/mahalob1tches) : Go to this link and be sure to allow it to get your location – you can input your address too – and you'll be able to see an animation of the ISS with the Google Street View surroundings, so you will know EXACTLY where to look, and when! BAD ASS!!