fourmilab

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Ancient Web: Your Sky Is a Browser Planetarium from the CGI Era

John Walker's Your Sky turns a browser into an interactive planetarium, generating sky maps, horizon views and virtual-telescope plots for arbitrary dates, locations and celestial objects.

Ancient Web: Fourmilab Shows How to Bend Spacetime in the Basement

Fourmilab's Bending Spacetime in the Basement explains how a simple torsion balance can reveal the gravitational attraction between ordinary objects using the same basic principle behind Cavendish's classic experiment.