How to Spot the ISS in the Night Sky

![A steady bright point crossing the twilight sky as someone compares its path with a pass forecast.]

Check a predicted ISS pass

When a bright point moves steadily across the sky, first compare its timing and direction with NASA’s official forecast for your location. Open Spot the Station and look for a scheduled pass. Outside, watch for a point moving smoothly across the sky. The ISS can look very bright, but it does not flash like an aircraft or make abrupt turns.

1. Open NASA’s pass forecast and choose your location.
2. Note when the next visible pass starts, its direction, and how long it lasts.
3. Compare what you see with those details before calling it the ISS.

Why the station shines

The station is not making visible light like a lamp; it reflects sunlight as it travels in low Earth orbit. From the ground, that reflection can appear as a bright point, especially when your sky is dark or at dusk while the station is still sunlit. Its smooth motion is a useful clue, but checking a forecast makes identification much more reliable.

What this clue cannot prove

A steady point is not automatically the ISS. Other satellites can look similar, and visibility and brightness depend on your location, the station’s path, the time, and the Sun’s position. Clouds and city lights can also make viewing difficult. If the timing or direction does not match the forecast, leave the identification uncertain rather than forcing it. NASA’s page helps you check specific passes; it cannot guarantee that you will see one every time you look.