Jupiter hour
Choose a city and date
Growth, learning and perspective.
Traditionally associated with study, generosity and looking at the bigger picture.
Free planetary hours calculator
The rhythmof your day.
Use the free planetary hours calculator to find the ruling planet for your city and date.
Current hour
Your planetary hour
Your planetary-hour schedule
Choose an hour to explore its traditional meaning.
Select an hour to turn the dome toward its ruler. Illustrative sky presentation.
In the dome
Selected hour
Planetary hours are not fixed 60-minute periods. Daylight is divided into 12 equal parts, and the night into 12 more. Times are shown in your selected city's time zone.
The personal perspective
The same sky.
A year made for you.
The free calculator shows traditional planetary rulers. Astronizer adds guidance calculated for your birth chart, with room to plan your days.
For a short printable planning guide, explore the free Moon Planner for October 27–November 2, 2026. It uses general lunar guidance, not your birth chart.
For a full year on paper and online, explore the 2027 personalized astrology planner.
$79 USD · Your personalized printed organizer
Includes yearly web access and Standard US shipping. Express costs extra; applicable tax is additional.
A place for your plans
Daily guidance.
Space to make it yours.
Daily readings, hourly timing cues, monthly perspectives and dedicated celestial-event readings, alongside practical writing space.
The organizer's fixed clock-hour schedule and these traditional planetary-hour intervals are different ways of reading the day.
What is a
planetary hour?
Traditional planetary hours follow the repeating order of Saturn, Jupiter, Mars, the Sun, Venus, Mercury and the Moon. The first hour after sunrise belongs to that weekday's planetary ruler.
A planetary day runs from sunrise to the following sunrise. Before sunrise, the current hour still belongs to the previous planetary day. Day and night hours change length with the season and latitude.
These meanings describe an astrological tradition, not scientifically established predictions. Sunrise and sunset are calculated approximately; terrain and atmospheric conditions can affect observed times.
How do I find today’s planetary hours?
Choose your city, select Today, then select Show planetary hours. The schedule uses your selected city’s local time. Choose any hour to explore its ruler and traditional meaning.
Why do planetary hours have different lengths?
There are always 12 daytime and 12 nighttime intervals in this method. A longer summer day gives longer daylight hours and shorter night hours. A shorter winter day does the reverse.
Are these hours personalized to my birth chart?
No. This free calculator uses your chosen city and date. Personalized guidance requires birth details and a separate calculation. This free calculator does not collect birth details.
Why are some polar dates unavailable?
This method needs sunrise and sunset to divide the day and night. When the sun stays above or below the horizon, the normal 24-interval schedule cannot be calculated.
Planetary hours
by city.
See today's complete 24 planetary hours, including the local sunrise and sunset, without using the interactive calculator.
New York City · Buffalo · Albany
Charlotte · Raleigh · Greensboro
United Kingdom: London · Manchester
Birmingham · Leeds · Liverpool · Bristol
For AI agents
and developers.
AI assistants are welcome to use Astronizer’s free planetary-hours API. Get city schedules and current rulers as structured data, with no account or API key.
Read the API guide and examples or open the public OpenAPI specification.