Zenith app renders your real-time local sky with live stars, planets, and ISS tracking

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A developer built Zenith, a browser-based app that uses your GPS location to display an accurate, real-time first-person view of the sky above you. The app plots roughly 8,900 naked-eye stars from the HYG database at their true positions, color-coded by temperature, while the Sun, Moon, and planets are computed using the astronomy-engine library for your exact latitude, longitude, and current time. The entire celestial sphere rotates at the real sidereal rate, so stars and planets visibly rise and set as you watch. Tapping any object triggers a cinematic fly-out through the starfield, with Google Gemini generating a contextual explanation read aloud via ElevenLabs. The app also tracks the International Space Station live and displays the names of all humans currently in space.

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