How to Spot the International Space Station Tonight
The International Space Station is one of the easiest things in the night sky to see once you know when to look. It needs no telescope, it is bright, and it crosses the sky in a few minutes. The catch is timing: the station is only visible during certain passes, and those passes change from night to night.
NASA runs an official service called Spot the Station that does the hard part for you. This guide explains how to read its sighting information, what the station looks like when it appears, and why some places never see it straight overhead.
1. A few facts that explain what you will see
According to NASA's station facts page, the ISS travels at about five miles per second and orbits Earth "about every 90 minutes." In 24 hours it makes 16 orbits, passing through 16 sunrises and sunsets. The Spot the Station page puts its speed at 17,500 miles per hour (28,000 kilometers per hour).
That speed is why it moves so quickly across your sky. NASA compares it to an airliner: airplanes fly at about 600 mph (965 kph), so the station is moving roughly 29 times faster.
The station is also large. NASA lists it as 356 feet (109 meters) end to end, about the length of an American football field including the end zones, with solar arrays that catch a lot of sunlight.
2. Why sightings happen near sunrise and sunset
The Spot the Station page explains that "all International Space Station sightings will occur within a few hours before or after sunrise or sunset." NASA calls this "the optimum viewing period as the Sun reflects off the space station and contrasts against the darker sky." In other words, the glow you see is sunlight bouncing off the station while the ground where you stand is already dark.
In practice, that means looking for evening passes after sunset and morning passes before sunrise.
3. How to read a sighting
NASA's Spot the Station app and website list upcoming passes for your location. Each sighting includes five pieces of information, defined on NASA's page:
| Field | What it means |
|---|---|
| Time | When the sighting begins, in your local time zone |
| Above the Horizon | How long the station stays visible before dropping below the horizon |
| Maximum Height | How high it climbs, in degrees: 0 is the horizon and 90 is straight overhead |
| Appears | Where it first becomes visible, in degrees above the horizon plus a compass direction |
| Disappears | Where it leaves your view |
A worked example. The values here are made up to show how to read them. Suppose a sighting lists a time of 7:12 PM, 5 minutes above the horizon, a maximum height of 64 degrees, appearing at 10 degrees above the northwest, and disappearing at 12 degrees above the southeast. You would face northwest a minute or two before 7:12, look a little above the horizon, and then follow the station as it climbs to about 64 degrees, which is roughly 70 percent of the way from the horizon to straight overhead, before it sinks toward the southeast.
Passes with a higher maximum height are generally easier to catch, because the station is above trees and buildings for longer.
4. What the station looks like
NASA describes it clearly: the space station "appears similar to an airplane or a very bright star moving across the night sky, except it does not have flashing lights or change direction." Three quick checks tell it apart from a plane:
- No blinking. Aircraft have flashing navigation lights; the ISS is a steady point.
- A straight, smooth path. It does not turn or bank.
- Speed. It crosses a large part of the sky in a few minutes.
5. Why some places never see it overhead
NASA's page explains that the station orbits with an inclination of 51.6 degrees, so "the farthest north and south of the equator it will go is 51.6 degrees latitude." If you live farther north or south than that, the station never passes directly overhead. NASA gives Alaska as an example and notes that the app may not list every visible pass in those locations, so it recommends checking the full Next Sighting(s) List on the app's home page.
The good news for most people is the flip side: NASA's facts page says the station's orbital path takes it over 90 percent of Earth's population.
6. How NASA keeps predictions accurate
Even at the station's altitude, the thin outer atmosphere creates drag, which slowly changes its orbit. NASA says flight controllers update the station's trajectory data "approximately three times a week." That is why sighting times can shift slightly, and why it is worth checking the list again on the day you plan to look.
7. A simple plan for your first sighting
- Open NASA's Spot the Station website or app and set your location.
- Pick a pass with a maximum height of 40 degrees or more.
- Go outside a few minutes early and face the "Appears" direction.
- Look for a steady, bright point moving smoothly with no blinking lights.
- Follow it until it reaches the "Disappears" direction.
8. Key takeaways
- The ISS orbits Earth about every 90 minutes at roughly 17,500 mph, about 29 times faster than an airliner.
- Sightings happen within a few hours before or after sunrise or sunset, when sunlight hits the station against a dark sky.
- NASA's Spot the Station lists the time, duration, maximum height, and where the station appears and disappears.
- It looks like a bright, steady star with no blinking lights, moving in a straight line.
- Because of its 51.6 degree orbit, places farther north or south than that latitude never see it directly overhead.