technology
Stars, Clocks and the Secret Clockwork of America
April 3, 2026
On a hill above Washington, D. C. , a team of scientists watches the sky. They belong to the U. S. Naval Observatory, or USNO for short. Their job is simple: keep track of the stars and the exact moment in time. Since 1873 a telescope at USNO has watched bright stars every night. The data
