10/11/2026
Why are there exactly seven days in a week? Look up. For thousands of years people saw only seven lights that moved against the stars: the Sun, the Moon, and the five visible planets.
Ancient Babylonians tracked them carefully. Then Persian empires and Sogdian scholars carried the idea across Asia and into Europe — naming each day after one of those celestial bodies:
Sunday — the day of the Sun (Mehrshid)
Monday — the day of the Moon (Mahshid)
Tuesday — the day of Mars (Bahramshid)
Wednesday — the day of Mercury (Tirshid)
Thursday — the day of Jupiter (Ormazdshid)
Friday — the day of Venus (Nahidshid)
Saturday — the day of Saturn (Keyvanshid)
This planetary week traveled the Silk Road to China and westward to Rome. English still hides the same secret: Sun-day, Moon-day, and the gods who stood in for the planets.
Seven moving lights in the sky became the seven days that structure our lives. An ancient observation that still runs the world.