ISS Viewer is a free and open source app that makes spotting the International Space Station very easy. It predicts when ISS will be visible from your location and displays those passes on a map. All you have to do is look at the sky at the right time to see it!

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The International Space Station reflects a lot of light and can be easily viewed with the naked eye. You don't need to use a telescope or any other equipment to see it.

Learn more about ISS on wikipedia