Planetary Hours Calculator
Calculate traditional day and night planetary hours from sunrise and sunset, follow the Chaldean order, and choose better timing for study, love, discipline, creativity, rest and planning.
Calculate Planetary Hours
Planetary hours divide the daylight period from sunrise to sunset into 12 equal parts, then divide the night from sunset to the next sunrise into 12 more parts. Because sunrise and sunset change with date and location, planetary hours are usually not exactly 60 clock minutes. This calculator provides city-based approximate solar times and also lets you enter exact sunrise and sunset manually.
Each daytime and nighttime segment below is ruled by a planet in the Chaldean order.
Daytime Planetary Hours
| # | Planet | Approx. Time | Suggested Uses |
|---|
Nighttime Planetary Hours
| # | Planet | Approx. Time | Suggested Uses |
|---|
How Planetary Hours Work
Planetary hours are a traditional astrological timing system. Unlike modern clock hours, they are unequal. The daytime period is divided into twelve parts and the nighttime period is divided into twelve parts. On a long summer day, daytime planetary hours are longer than sixty minutes. On a short winter day, daytime planetary hours are shorter than sixty minutes. Nighttime hours adjust in the opposite direction.
The planet ruling the first hour after sunrise gives the day its planetary ruler. Sunday begins with a Sun hour, Monday begins with a Moon hour, Tuesday begins with a Mars hour, Wednesday begins with a Mercury hour, Thursday begins with a Jupiter hour, Friday begins with a Venus hour and Saturday begins with a Saturn hour. After that first hour, the planets repeat in the Chaldean order: Saturn, Jupiter, Mars, Sun, Venus, Mercury, Moon.
This order may look unusual at first, but it creates the familiar order of the weekdays when carried through 24 hours. Because there are seven planets and twenty-four hours, the next day begins three planets later in the sequence. That is why the day after Sunday is Monday, then Tuesday, Wednesday, Thursday, Friday and Saturday.
1. Find Sunrise
The planetary day begins at local sunrise. The first planetary hour starts at sunrise and is ruled by the planet of that weekday.
2. Divide Daylight
Measure the time from sunrise to sunset and divide it by twelve. This gives the length of one daytime planetary hour.
3. Divide Night
Measure the time from sunset to the next sunrise and divide it by twelve. This gives the length of one nighttime planetary hour.
4. Repeat the Order
Assign planets in Chaldean order through all twenty-four planetary hours, continuing smoothly from day into night.
| Weekday | Day Ruler | First Hour After Sunrise | Best General Themes |
|---|---|---|---|
| Sunday | Sun | Sun hour | Leadership, vitality, visibility, confidence, public work. |
| Monday | Moon | Moon hour | Home, emotions, intuition, care, family, reflection. |
| Tuesday | Mars | Mars hour | Action, courage, competition, conflict resolution, physical tasks. |
| Wednesday | Mercury | Mercury hour | Study, writing, trade, messages, planning, short trips. |
| Thursday | Jupiter | Jupiter hour | Growth, teaching, law, wisdom, generosity, opportunity. |
| Friday | Venus | Venus hour | Love, beauty, art, peace, social connection, pleasure. |
| Saturday | Saturn | Saturn hour | Discipline, boundaries, long-term planning, responsibility. |
Planetary Hour Meanings
Each planetary hour is traditionally suited to the themes of its ruling planet. Use these meanings as symbolic timing guidance, not as rigid rules. If the practical situation demands action now, do not ignore reality just because the hour is imperfect. Planetary hours are most helpful when you have flexibility and want to align a task with the appropriate mood.
♄ Saturn Hour
Saturn hours support discipline, boundaries, structure, long-term responsibilities, difficult decisions and serious planning.
- Good for budgets, rules, commitments and study.
- Avoid for light social work if you want softness.
♃ Jupiter Hour
Jupiter hours support expansion, teaching, legal matters, generosity, growth, wisdom, mentoring and opportunity.
- Good for applications, learning and big-picture planning.
- Avoid overpromising or assuming luck is enough.
♂ Mars Hour
Mars hours support action, courage, competition, strength, cutting through obstacles and confronting problems.
- Good for workouts, decisive action and urgent tasks.
- Avoid for sensitive conversations unless directness is needed.
☉ Sun Hour
Sun hours support visibility, leadership, confidence, recognition, vitality, authority and public presentation.
- Good for launches, leadership meetings and creative confidence.
- Avoid arrogance or forcing attention.
♀ Venus Hour
Venus hours support love, beauty, peace, pleasure, art, diplomacy, social harmony and attraction.
- Good for dates, design, gifts and reconciliation.
- Avoid for tasks requiring harsh confrontation.
☿ Mercury Hour
Mercury hours support communication, writing, study, business, trade, short trips, messages and analysis.
- Good for emails, exams, editing and negotiation.
- Avoid scattered multitasking.
☽ Moon Hour
Moon hours support emotions, home, care, intuition, rest, food, family, memory and daily needs.
- Good for reflection, domestic work and emotional check-ins.
- Avoid making purely mood-driven decisions.
Best Uses for Planetary Hours
Planetary hours are used in traditional astrology, electional timing, ritual planning, herbal work, spiritual practice and everyday intention setting. You do not need to be overly strict. Many people simply choose a helpful hour when timing is flexible: a Mercury hour for writing, a Venus hour for beauty or love, a Jupiter hour for growth, or a Saturn hour for discipline.
For Work and Career
Use Sun hours for visibility, Mercury hours for communication, Jupiter hours for professional growth and Saturn hours for serious planning.
For Love and Social Life
Use Venus hours for dates, peace-making and beauty. Moon hours are good for emotional conversations, family and comfort.
For Study and Writing
Mercury hours are the classic choice for writing, editing, research, messages, teaching and learning.
For Courage and Action
Mars hours can help with workouts, direct action, competition and cutting through resistance.
For Money and Growth
Jupiter hours are often chosen for expansion, abundance, teaching, legal matters and opportunity. Venus can help with sales involving beauty or pleasure.
For Discipline
Saturn hours are useful for boundaries, long-term commitments, debt review, structure and tasks you have avoided.
Timing Aid, Not a Guarantee
Planetary hours do not guarantee success. They are a symbolic timing tool. Good preparation, clear communication and practical reality still matter more than choosing a perfect hour.
Example Planning Table
The table below gives practical examples of how someone might choose a planetary hour. Use it as a quick reference when planning daily tasks. The most powerful timing is often a combination of the planetary day and planetary hour, such as a Venus hour on Friday or a Mercury hour on Wednesday.
| Goal | Best Planetary Hour | Good Planetary Day | Reason |
|---|---|---|---|
| Send an important email | Mercury | Wednesday | Mercury supports messages, writing, negotiation and information exchange. |
| Ask for a raise | Sun or Jupiter | Sunday or Thursday | Sun supports confidence and authority; Jupiter supports growth and opportunity. |
| Plan a date | Venus | Friday | Venus supports beauty, affection, harmony and pleasure. |
| Start a workout routine | Mars | Tuesday | Mars supports strength, courage, competition and physical energy. |
| Set boundaries | Saturn | Saturday | Saturn supports discipline, maturity, structure and responsibility. |
| Journal or rest | Moon | Monday | Moon supports emotions, intuition, home, care and reflection. |
Practical Tips for Using Planetary Hours
Simple Rules That Make Planetary Hours Easier
- Use exact sunrise/sunset when possible: city presets are helpful, but exact local data is better.
- Combine day and hour: a Venus hour on Friday or a Mercury hour on Wednesday feels especially aligned.
- Match the task to the planet: choose Mercury for communication, Mars for action, Venus for harmony and Saturn for structure.
- Do not obsess over perfection: being roughly within the hour is usually enough for casual planning.
- Use difficult hours wisely: Mars and Saturn are not “bad”; they are better for hard work, courage, boundaries and discipline.
- Watch your own energy: if you are exhausted, a good planetary hour will not replace rest.
- Record results: keep a journal to see which planetary hours feel useful for your personal routine.
Planetary Hours FAQ
What are planetary hours?
Planetary hours are an astrological timing system where each segment of the day and night is ruled by one of the seven traditional planets: Saturn, Jupiter, Mars, Sun, Venus, Mercury and Moon.
How are planetary hours calculated?
Take the time from sunrise to sunset and divide it by 12 for daytime hours. Then take sunset to the next sunrise and divide it by 12 for nighttime hours.
Are planetary hours exactly 60 minutes?
Usually no. They are longer or shorter depending on season and location. They are close to 60 minutes only around the equinoxes when day and night are nearly equal.
What is the Chaldean order?
The Chaldean order used for planetary hours is Saturn, Jupiter, Mars, Sun, Venus, Mercury and Moon. The sequence repeats through all 24 planetary hours.
Which planet rules each weekday?
Sunday is Sun, Monday is Moon, Tuesday is Mars, Wednesday is Mercury, Thursday is Jupiter, Friday is Venus and Saturday is Saturn.
What is the best planetary hour for love?
Venus hours are traditionally favored for love, beauty, peace, art and social harmony. Moon hours can also support emotional connection and comfort.
What is the best planetary hour for money?
Jupiter hours are often used for growth, opportunity, teaching, law and abundance. Mercury hours can help with trade, negotiation and business communication.
Are Mars and Saturn hours bad?
No. Mars and Saturn are not bad; they are simply more intense. Mars suits action and courage. Saturn suits discipline, boundaries and serious responsibilities.
Do I need exact city coordinates?
For precise planetary hours, yes. Exact sunrise and sunset depend on latitude, longitude, date and local time zone. This page includes manual sunrise/sunset input for better precision.
Can I use planetary hours for rituals?
Many traditions use planetary hours for ritual timing. Choose the planet that matches your intention and consider using both the planetary day and hour for stronger symbolism.
What if I miss the perfect hour?
Do not worry. Planetary hours are a timing aid, not a strict rule. Practical action, preparation and clear intention matter more than perfect timing.
Why do city preset times differ from other calculators?
This page uses approximate built-in solar math for demo use. Official sunrise/sunset tools may differ by a few minutes due to exact coordinates, elevation, refraction and timezone handling.
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