Planetary Hours
A simple, ancient device. The day from sunrise to sunset is divided into twelve equal parts and the night likewise into twelve, so each hour is unequal — long in summer days, short in winter days. The first day-hour is ruled by the planet of the weekday, then the rulership cycles through the Chaldean order: Saturn, Jupiter, Mars, Sun, Venus, Mercury, Moon. Computed for your exact location with Swiss Ephemeris from real sunrise and sunset, not clock noon.
Why hours are unequal
The sky does not run on a sixty-minute clock. Daylight in Berlin in June lasts almost seventeen hours; in December, less than eight. A planetary hour stretches and contracts with the season, so it remains a true twelfth of the local daylight or night. The technique is older than the mechanical clock and refuses to be flattened by it. Your sunrise, your sunset, your hour.
The Chaldean order and the days
The seven planets, ordered by their classical orbital speed, descend from Saturn to the Moon. Sunday begins with the Sun in its first day-hour; Monday begins with the Moon; Tuesday with Mars; Wednesday with Mercury; Thursday with Jupiter; Friday with Venus; Saturday with Saturn. The names of the days in Romance and Germanic languages still carry this scheme. The cycle through the twenty-four hours then lands the next day on its proper ruler — a closed mathematical loop.
How to use the hour
Match the hour's ruler to the matter. A Mercury hour for an important email, the explanation, the negotiation. A Venus hour for the gentle conversation, the artistic gesture, the apology you mean. A Saturn hour for the foundational task you keep avoiding. Mars for what needs decisive cutting, Sun for the public announcement, Jupiter for asking a favour, Moon for what is intimate and changing. The hour does not do the work; it shapes the room you do it in.
Hours inside the larger toolkit
Planetary hours are the smallest scale on the ladder. Annual profections handle the year, Firdaria the decade, Zodiacal Releasing the chapter, electional astrology the moment — and the hour is the moment's smallest natural unit. In an election, choosing an hour whose ruler is also a benefactor in your natal chart is one of the cheapest ways to add coherence. As a daily practice, planetary hours teach you to feel the texture of time without consulting a chart.
Frequently Asked Questions
Why not just use the modern 60-minute hour?
Because the technique is solar, not mechanical. A planetary hour is by definition one twelfth of the actual daylight or night at your location. Using clock hours would assign rulers to durations the technique was never built for, and the seven-day rotation through twenty-four positions would no longer close cleanly.
Do planetary hours work above the Arctic Circle?
Imperfectly. With no sunrise or no sunset for weeks, the twelve-part division breaks down. Practitioners at high latitudes use various conventions — civil twilight as a substitute, equal hours, or the local meridian. We display a warning if your coordinates produce an unusable cycle and offer the equal-hour fallback.
How precise does my location need to be?
City-level precision is enough. The difference between two neighbourhoods of the same city is a few seconds; the difference between a city and the wrong country can be more than an hour. We compute true sunrise and sunset for the coordinates you supply and adjust automatically for daylight saving where applicable.
Should I avoid the hour of an unfavourable planet entirely?
Not entirely — match planet to task. A Saturn hour is excellent for foundations, paperwork, what requires patience and form. It is poor for celebrations or first dates. The hour is not good or bad; it has a temperament. You either work with the temperament or you choose a different hour.