November 1, 2025The Shepherd Clock, Royal Observatory, Greenwich, England, 1852. The first clock ever to show Greenwich Mean Time (GMT) directly to the public. It shows 24 hours on its face, so at 12 noon the hour hand points straight down. Public Standards of Length and OS Benchmark appear below… [1280×854] [OC]
November 1, 2025The carved basalt Monument 21 at the Mesoamerican archaeological site of Bilbao in Guatemala. Cotzumalhuapa culture, Classic period (250-900 CE) [2047×3179]
