Star Trails Reveal Earth's Slow Spin from Paranal
TL;DR Summary
APOD's Aug 28, 2026 image from ESO's Paranal Observatory in Chile stacks 300 frames of 25 seconds each to trace star trails around the south celestial pole, illustrating Earth's rotation at about 1,500 km/h as seen from 25°S, with the AT 3 telescope visible in the foreground.
2026 August 28 – The Sky Turns Above Paranal NASA (.gov)
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