Private astrology calculator
Planetary hours for your place, today
Planetary hours split the time from sunrise to sunset, and from sunset to the next sunrise, into twelve unequal hours each, ruled in turn by the seven classical planets; pick a city and the hours for that place are computed here, offline.
Place and date
Choose a place and a date
Pick a city, or use your current location; the hours for that place are computed for the date you choose.
Read next · carries this chart in memory
Direct answer
What you need
Only a place and a date — no birth time, and nothing about you. Pick a city, or use your current location, and the twenty-four planetary hours for that place and date are computed below.
They are not uploaded, saved or placed in the URL.
Method & limits
A classical division, computed exactly.
Sunrise and sunset come from the same documented engine every chart on this site uses — the apparent event, upper limb, standard atmospheric refraction — never a rounded lookup table. Near the poles, on a date with no clean sunrise-to-sunrise cycle, this calculator says so rather than inventing twelve equal hours.
Frequently asked questions
What are planetary hours?
Planetary hours are a classical system that divides the time from one sunrise to the next into twenty-four unequal hours — twelve spanning sunrise to sunset, twelve spanning sunset to the following sunrise — each ruled in turn by one of the seven classical planets in a fixed, repeating order: Saturn, Jupiter, Mars, Sun, Venus, Mercury, Moon.
Why aren't the hours sixty minutes long?
Each planetary hour is a twelfth of the actual daylight or actual night at your chosen place and date, not a fixed sixty minutes. A summer day hour can run well over an hour while a summer night hour runs well under one; the two periods trade places again at the equinox and swap again toward winter.
Which sunrise and sunset does this use?
Every sunrise and sunset here is the apparent event — the moment the Sun's upper limb crosses the horizon, adjusted for standard atmospheric refraction — computed by Astronomy Engine, the same open-source ephemeris used across this site, for the exact coordinates of the place you pick.
Why does the planetary day start at sunrise instead of midnight?
The classical system's own day begins at sunrise, not civil midnight: the first hour after sunrise is ruled by that weekday's own planet (Sunday opens with the Sun, Monday with the Moon, and so on), and the following twenty-three hours continue the same seven-planet cycle without a break, straight through the next sunrise.
What happens at high latitudes, where the Sun sometimes doesn't rise or set?
Near the poles, on dates with no sunrise, no sunset, or a cycle too distorted to form a clean day, this calculator marks the result unavailable and says why, rather than inventing twelve equal hours to fill the gap — a plausible-looking chart for a day the classical system was never built to describe.
Is the location I choose sent anywhere?
No. The city search runs against an offline list already loaded in your browser, and every planetary-hour calculation runs there too, using the same local astronomy library as the rest of this site. Nothing about the place or date you choose is uploaded, stored on a server, or placed in the page URL.