Planetary hours, explained

The system of planetary hours comes from the Hellenistic and Chaldean tradition. The day from sunrise to sunset is divided into twelve equal parts (the day hours), and the night from sunset to sunrise into twelve more (the night hours). Because day and night are rarely the same length, these "hours" stretch and compress through the year.

The seven classical rulers — Saturn, Jupiter, Mars, Sun, Venus, Mercury, Moon — cycle in that order through every hour of every day. The first hour of each day is ruled by the planet the day is named after: Sunday begins with the Sun, Monday with the Moon, Tuesday with Mars (Mardi), and so on.

Why care? Because each planet flavors its hour with a particular quality of action. - Sun — leadership, visibility, bold asks. - Venus — beauty, love, magnetism. - Mercury — writing, learning, negotiation. - Moon — intuition, rest, the body. - Mars — courage, exercise, decisive action. - Jupiter — expansion, teaching, opportunity. - Saturn — structure, discipline, finishing.

You don't need to live by the clock. But choosing a Venus hour to write a love letter, or a Mars hour to send a hard email, can stack the deck in your favor.