Armillary sphere — the sky as rings (3D)

About this app

Horizon and meridian fixed, the celestial sphere turns about the axis tilted to the latitude, the sun runs along the ecliptic. Choose date, time and place: day arc, day length, noon altitude and declination update live — the seasons come from the tilt, not the distance. Exhibit-ready.

Subject: Astronomy

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• The Sun today
• Exoplanet Galaxy (3D)
• Expansion of the universe (3D)
• Gravitational waves (3D)
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• Moon phases and eclipses
• Planetarium (3D)
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