The International Space Station orbits Earth roughly every 90 minutes at an altitude of about 420 kilometres. When it catches sunlight against a dark sky, it becomes one of the brightest objects visible — brighter than any star, and often brighter than the planets.
You do not need a telescope, binoculars, or any equipment at all. The ISS is visible to the naked eye from almost anywhere on Earth, provided you know when and where to look.
When Is the ISS Visible?
The ISS is visible during the window shortly after sunset or before sunrise — typically the first two hours after dusk and the last two hours before dawn. During this time the sky is dark enough to see the station, but the ISS is still high enough to be illuminated by the Sun.
Pass visibility depends on your location, the station's current orbit, and the time of year. Some weeks you might get multiple bright passes per night; other weeks, none at all. Use Orbital Radar's Sat Pass tool to check exact times for your location.
What Does the ISS Look Like?
The ISS appears as a bright, steady, white light moving smoothly across the sky. Unlike aircraft, it has no flashing lights. Unlike meteors, it moves steadily rather than streaking and disappearing. A typical pass takes 3–6 minutes to cross the sky from horizon to horizon.
At its brightest, the ISS can reach magnitude –3.5 or brighter — outshining every star and rivalling Venus. Even on a less-than-ideal pass, it is usually clearly visible as a moving "star" that is obviously not stationary.
Step-by-Step: Spot the ISS
1. Find Your Pass Time
Open Orbital Radar and use the Sat Pass feature from the left menu. Enter your location to see upcoming ISS passes with start time, direction, maximum elevation, and brightness.
2. Understand the Pass Details
A pass listing tells you three key things: when it starts (the ISS appears above the horizon), the maximum elevation (how high it climbs — 90° is directly overhead), and when it ends (the ISS fades into Earth's shadow or drops below the horizon). Higher-elevation passes are brighter and easier to see.
3. Head Outside Early
Go out 3–5 minutes before the listed start time. Face the direction indicated for the start of the pass (usually west or southwest). Let your eyes adjust to the darkness — avoid looking at your phone screen immediately before the pass.
4. Watch It Cross the Sky
The ISS will appear as a bright point of light, rising from the horizon and tracking smoothly across the sky. It may fade and disappear mid-pass as it enters Earth's shadow — this is normal and often looks like the station is "switching off."
Why Can't I See the ISS Every Night?
The ISS orbits at an inclination of 51.6°, which means it does not pass directly over locations above about 52° latitude on every orbit. Combined with the requirement for the right lighting conditions (dark sky, sunlit station), there are natural gaps in visibility that can last days or even a couple of weeks for some locations.
Patience pays off — when a good pass window opens, you often get several bright passes within a few days.