ISS SkyTransit

Lightstram

About this app

🛰️ ISS SkyTransit – ISS Transit Predictions

Photograph the International Space Station passing in front of the Sun or the Moon, thanks to high-precision astronomical calculations.

ISS SkyTransit calculates exactly when and where solar and lunar ISS transits will be visible from your location, using real-time NORAD orbital data (TLE) and NASA JPL planetary ephemerides.

Get to the right spot. Be on time. Capture the perfect silhouette.

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✨ WHAT IS AN ISS TRANSIT?
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A transit happens when the International Space Station passes exactly in front of the Sun or the Moon, creating a spectacular silhouette visible for less than two seconds.

These events are rare and visible only from a very precise geographic area. ISS SkyTransit helps you locate them.

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🎯 KEY FEATURES
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📍 Precise location
• Automatic GPS geolocation
• Manual coordinate entry
• Selection on an interactive map
• Search radius up to 100 km
• Calculations adjusted for altitude

⏰ Advanced predictions
• Forecasts up to 30 days ahead
• Real-time ISS NORAD orbital data (TLE)
• Automatic orbital data updates

🌅 Complete transit details
• Exact time (UTC and local)
• Transit duration (usually < 2 seconds)
• Distance from your location
• Elevation and azimuth
• Crossing angle over the Sun or Moon
• Apparent angular speed
• Moon phase for lunar transits

🗺️ Map visualization
• Transit center line
• Optimal visibility zone
• Best observation spot planning

📸 Built for astrophotography
• Precise timing for burst photography
• Optimal positioning
• Detailed solar and lunar information

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🔬 PROFESSIONAL ASTRONOMICAL DATA
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• Official NORAD / CelesTrak orbital elements
• NASA JPL DE421 planetary ephemerides
• Optimized algorithms for fast results

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🚀 WHY CHOOSE ISS SKYTRANSIT?
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✅ High-precision ISS transit predictions
✅ Clear, intuitive interface
✅ Instant results
✅ No ads
✅ Works worldwide
✅ Dark and light mode
✅ Free, no subscription

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⚠️ WARNING – SOLAR TRANSIT SAFETY
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Observing or photographing the Sun without proper protection can cause permanent eye damage or blindness.

During a solar ISS transit:

• Never look directly at the Sun without glasses certified to the ISO 12312-2 standard.
• Always use a certified solar filter for cameras, telescopes, or binoculars.
• Do not use regular sunglasses, smoked glass, or improvised filters.
• Make sure your equipment is properly set up and secured.
• Supervise children during solar observations.

ISS SkyTransit only provides astronomical position and timing calculations.

Users are solely responsible for following safety rules during solar observations. The developer accepts no liability for injury, property damage, or misuse of equipment.

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🌟 START OBSERVING
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Never miss a solar or lunar ISS transit again.
Plan with precision and capture a unique moment in the sky.

What’s new

• New advanced settings: ISS illumination, minimum altitude, time window, transit type, Moon illumination percentage
• Redesigned advanced filters (search radius, number of days)
• More accurate real flight path shown on the map
• Search radius shown on the map
• ISS illumination added to transit cards
• Faster search results
• Display and stability fixes