ISS Tracker: Tiangong & Hubble

An ISS tracker for the passes you can see from your own place, with Tiangong and Hubble too. Want to see the space station with your own eyes? Save the places you watch from and get predicted passes of the ISS, Tiangong and Hubble, with the time to step outside, the direction to face and how high to look.

▶ TONIGHT
• The next pass that may be visible from your place: start time, the direction it appears and leaves, and how high it gets.
• A countdown, a sky chart of its path (north up) and a brightness estimate.
• Three reasons you can check: is the station in sunlight, is your sky dark enough, is it high enough.

▶ ALL PASSES FOR 10 DAYS
• Every pass above your minimum height, with the part that may be visible shown separately from the whole pass.
• Filter "Potentially visible" or "All". Passes in Earth's shadow or in daylight are labelled as such.
• A pass that is interrupted — by a blocked direction or by Earth's shadow — is shown in parts, each with its own times.

▶ LOOK NOW
• During a pass: which direction to face, how high to look and how much time is left, on a true-north sky chart. The screen stays on.

▶ YOUR PLACES
• Save several places (home, cabin, a dark-sky spot) with their own time zone.
• Set a minimum height and mark directions blocked by buildings or trees; the visible times follow your horizon.
• Choose how dark the sky must be (twilight limit) and which objects to follow.

▶ REMINDERS & SIGHTING LOG
• Optional reminders a few minutes before a pass. Delivery is not guaranteed: your phone may deliver them late.
• Tap "I saw it" to keep a log of your sightings with place and time.

▶ GOOD TO KNOW
• Passes are predicted from published orbit data, which the app updates when you are online. Predictions for later days are less certain; passes too far from the latest data are hidden and counted.
• Clouds, haze and light pollution are not known to the app. "Potentially visible" means the geometry and the sun allow it.
• The sky chart does not use the compass: find north yourself (or use a compass app).
• Hubble is usually faint and hard to see with the naked eye.
• Places, settings and your log are saved on this phone.
• Ads appear in the Passes, Places and Log tabs and sometimes after you close a pass. Ads are not shown in Look now, and pass details show no banner.

Recent changes:
Station Pass shows off a new icon: the space station with amber solar wings above Earth's curved edge, tracing a dashed mint pass among the stars. Your saved places, settings and log are just as before.