ISS SkyTransit

Lightstram

About this app

🛰️ ISS SkyTransit – ISS Transit Predictor & Tracker

Photograph the International Space Station crossing the Sun or Moon with ultra-precise astronomical calculations.

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

Plan your observation. Be in the right place. Capture the perfect silhouette.

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✨ WHAT IS AN ISS TRANSIT?
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An ISS transit occurs when the International Space Station passes directly in front of the Sun or Moon, creating a dramatic silhouette visible for less than two seconds.

These events are rare and only visible from a narrow geographic path. ISS SkyTransit helps you locate them with professional astronomical precision.

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🎯 KEY FEATURES
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📍 Precise Location
• GPS geolocation or manual coordinates
• Interactive map selection
• Search radius up to 100 km
• Altitude-adjusted calculations

⏰ Advanced ISS Predictions
• Accurate forecasts up to 30 days ahead
• Real-time NORAD TLE orbital data
• High-precision calculations using Skyfield
• Automatic orbital updates

🌅 Complete Transit Details
• Exact time (UTC & local)
• Transit duration (< 2 seconds typical)
• Distance from your position
• Altitude & azimuth
• Solar or lunar path angle
• Apparent angular velocity
• Moon phase for lunar transits

🗺️ Map Visualization
• Transit centerline display
• Optimal visibility corridor
• Easy planning to ideal viewing spot

📸 Designed for Astrophotography
• Precise timing for burst shooting
• Accurate alignment positioning
• Solar & lunar positioning data

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🔬 PROFESSIONAL DATA
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• Official NORAD / CelesTrak orbital elements
• NASA JPL DE421 planetary ephemerides
• High-precision astronomical computation
• Fast, optimized calculations

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

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

When observing an ISS solar transit:

• Never look directly at the Sun without certified solar glasses compliant with ISO 12312-2 standards.
• Always use a certified solar filter for cameras, telescopes, or binoculars.
• Do not use sunglasses, smoked glass, or improvised filters.
• Ensure equipment is securely mounted before observation.
• Supervise children during solar observation.

ISS SkyTransit provides astronomical timing and positioning calculations only.

Users are solely responsible for safe observation practices. The developer assumes no liability for injury, damage, or improper equipment use during solar observation.

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

What’s new

Prod version