Observed arrival · 2026-08-31
Sidereo, a pocket sky engine
An on-device astronomy companion that identifies stars, tracks planets, and lets you move through the night sky by gesture and time.
Field notes
The interface uses a movable aperture to identify objects inside the cursor while leaving the surrounding sky unlabelled. Scrolling advances the simulated clock rather than looping an animation, allowing a reader to inspect how the sky changes overnight. The page attributes its 9,096-star dataset to the Yale Bright Star Catalog and says planetary positions are calculated from Keplerian orbital elements. It also describes a native iPhone app using the same catalog file.
Observed signals
Read the marks
Editorial observations of this landing page, not a rating.
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