Which devices does the app run on?
iPhone and iPad with iOS 18 or iPadOS 18, or later.
Support
Questions and answers
About the app, and about how this site works out what is over your head.
The app
Is the app free?
It is free to download. Finding the planets, the Sun and the Moon is always free. Pro unlocks the rest, as a monthly or yearly subscription or a one-time purchase.
I already paid. How do I get my purchases back?
Open the plans screen in the app and tap Restore Purchases, signed in with the same Apple Account you bought with. That also brings back purchases made in earlier versions of the app.
How do I cancel or change a subscription?
Subscriptions are managed by Apple. On your iPhone open Settings, tap your name, then Subscriptions.
The arrow points the wrong way.
The arrow relies on the compass in your device, which metal and magnets disturb. Step away from cars, railings and speakers, take the device out of a magnetic case, and sweep it slowly through the air in a figure of eight. Check that Location Services are on for the app.
This site
Where do the pass times on this site come from?
From public orbital data published by CelesTrak, refreshed several times a day. Our server works the times out again each time you open a page, so they come from the latest orbit.
What counts as a visible pass?
The spacecraft is at least 10° above your horizon, the Sun is at least 6° below it so your sky is dark, and the spacecraft itself is in sunlight. The times shown are for the part of the pass that meets all three.
Why does another site show a slightly different time?
Sites draw the line in different places. Some count a pass from the moment the station clears the horizon, others from 10° up, and they differ on how dark the sky must be. The pass is the same; its listed start and end can differ by a minute or two.
How does the site know where I am?
It starts with a rough, city-level guess from your network address. If you press “Use my exact location”, your browser asks your permission, and the site sends your position, rounded to about a kilometre, to our server to work out the passes over it. We do not save it or link it to you, and the page forgets it when you close the tab.
More in the guides: How to see the International Space Station.