Planetary Hora Calculator
Find the ruling planetary hour (hora) for your selected time. This tool uses sunrise-to-sunrise planetary hour logic with unequal day/night hour lengths.
What Is a Hora Calculator?
A hora calculator identifies the ruling planet for a specific hour of the day using the traditional planetary hour system. In this system, each day is split into 24 horas: 12 during daylight (sunrise to sunset) and 12 during nighttime (sunset to next sunrise). Each hora is ruled by one of seven classical planets: Sun, Moon, Mars, Mercury, Jupiter, Venus, and Saturn.
Unlike fixed 60-minute clock hours, hora lengths change seasonally because daylight and nighttime durations are different throughout the year. That is why a proper calculator uses sunrise and sunset rather than standard hourly blocks.
How Planetary Horas Work
1) The day starts at sunrise
In hora practice, the first hour begins at sunrise and is ruled by that weekday's planetary lord:
- Sunday → Sun
- Monday → Moon
- Tuesday → Mars
- Wednesday → Mercury
- Thursday → Jupiter
- Friday → Venus
- Saturday → Saturn
2) Rulers follow the Chaldean order
After the first hour, rulers cycle in this repeating sequence:
- Saturn → Jupiter → Mars → Sun → Venus → Mercury → Moon
3) Day and night horas are unequal
Day hora length is:
(Sunset - Sunrise) ÷ 12
Night hora length is:
(Next Sunrise - Sunset) ÷ 12
How to Use This Calculator
- Choose the date for your sunrise-to-sunrise cycle.
- Enter the time you want to evaluate.
- Input sunrise, sunset, and the next day's sunrise.
- Click Calculate Hora to see the active ruler and full 24-hour schedule.
Practical Use Cases
People use hora timing for planning activities aligned with planetary symbolism:
- Sun hora: leadership, authority, visibility, recognition.
- Moon hora: family matters, care, intuition, public outreach.
- Mars hora: assertive actions, competition, decisive execution.
- Mercury hora: writing, sales, communication, analysis.
- Jupiter hora: teaching, counseling, learning, long-term planning.
- Venus hora: relationships, aesthetics, art, diplomacy.
- Saturn hora: discipline, structure, systems, focused deep work.
Tips for Better Accuracy
- Use local sunrise/sunset times for your city and date.
- Include daylight saving time when applicable.
- For pre-dawn checks, use the same cycle's next-day sunrise correctly.
- Treat hora as a planning aid, not a rigid rule.
Final Thoughts
A hora calculator is a simple but powerful scheduling lens. Whether you approach planetary hours spiritually, culturally, or just as a focus framework, this method can add intentional structure to your day. Use it alongside common-sense planning and your real-world priorities.