How to see the International Space Station with your own eyes

The ISS is easy to see without a telescope if you know when and where to look. When it is visible, what it looks like, and how to tell it from a plane.

You do not need a telescope

The International Space Station orbits about 400 km up and is the size of a football field, with huge solar panels that reflect sunlight. On a good pass it is brighter than any star in the sky and easy to spot from the middle of a city.

It crosses the sky in a few minutes as a steady, bright point of light. It does not blink and has no colored lights, which is the easiest way to tell it apart from an aircraft.

When it can be seen

You can only see the ISS when your sky is dark but the station is still in sunlight. That happens in the hour or two after sunset and before sunrise. In the middle of the night the station is usually in the Earth's shadow and invisible, even when it passes right overhead.

Because of this, visible passes come in runs: a week or two with several evening or morning passes, then a stretch with none. Checking a forecast saves a lot of waiting outside.

Reading a pass forecast

A forecast gives you everything you need to step outside at the right moment:

Start time: when it first becomes visible. Be outside a few minutes early.
Direction: where it appears and where it disappears, for example southwest to northeast.
Max height: how high it climbs, in degrees above the horizon. 90° is straight overhead; anything above 40° is a good pass; below 15°, it may hide behind buildings.
Duration: how long it stays visible, usually 2 to 6 minutes.

Why it sometimes vanishes mid-sky

If the station slowly fades and disappears before it reaches the horizon, it has flown into the Earth's shadow. Nothing went wrong: you just watched sunset from the space station's point of view.

Tips

Give your eyes a minute away from screens and streetlights.
Pick a spot with an open view in the direction the pass starts.
To photograph it, put the phone or camera on something steady and use a long exposure: the station draws a line across the frame.
Forecasts can shift by a minute as the orbit changes; check again on the day.