Sky chart
The pass drawn across your horizon, with the elevation threshold and the direction to face.
Live · SGP4 · Orekit · CelesTrak elements
Know the second it crosses your sky.
Pass predictions for any satellite in the catalogue, from any point on Earth. Rise, peak and set — with sunlight, Doppler and a sky chart built for eyes adapting to the dark.
Next pass · ISS (ZARYA) over LyonNOT YET COMPUTED
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- Rise
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- Peak
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- Set
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- Duration
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One pass, read four ways.
Each view answers a different question, and the pass list is always the text equivalent of the globe and the sky chart.
Globe
Ground track coloured by sunlight on the satellite, the visibility circle and the imaging swath.
Elevation profile
Elevation and range over time, with the Doppler shift when you give a downlink frequency.
Pass list
Every pass in the window as a table, exportable to CSV and to your calendar as .ics.
Next favourable window · 7 days
Compare up to five satellites.
Enter NORAD numbers or add satellites by name; the observer and threshold are the ones of the console above. Potential visibility means a sunlit satellite above a dark observer — weather and brightness are not modelled.
Times delimit favourable samples, with 10 s resolution; a single sample is not a measured duration.
The earliest favourable window of each satellite appears here, soonest first.