In one paragraph
Hora is the system of planetary hours. The daytime is divided into twelve horas and the night into twelve more, and each is ruled by one of the seven visible planets in a fixed, repeating order. The hora that begins at sunrise is always ruled by the planet of the weekday — the Sun on Sunday, the Moon on Monday. It is among the oldest timing tools in astrology, and it is also the reason the days of the week come in the order they do.
How the hours are measured
A hora is not sixty minutes. The time from sunrise to sunset is divided into twelve equal horas, and the time from sunset to the next sunrise into another twelve. In summer the daytime horas are longer than an hour and the night horas shorter; in winter the reverse. Only near the equinoxes, when day and night are equal, is every hora close to sixty minutes.
So, like Rahu Kaal and the Choghadiya, a hora table belongs to a place and a date. It has to be computed from that day's sunrise and sunset.
The order of the planets
The sequence runs from the slowest planet to the fastest: Saturn, Jupiter, Mars, Sun, Venus, Mercury, Moon — and then round again. The day does not always start at Saturn, though. It starts with the lord of the weekday and continues through the cycle from there.
| Weekday | First hora (at sunrise) | Then, in order |
|---|---|---|
| Sunday | Sun | Venus → Mercury → Moon → Saturn → Jupiter → Mars |
| Monday | Moon | Saturn → Jupiter → Mars → Sun → Venus → Mercury |
| Tuesday | Mars | Sun → Venus → Mercury → Moon → Saturn → Jupiter |
| Wednesday | Mercury | Moon → Saturn → Jupiter → Mars → Sun → Venus |
| Thursday | Jupiter | Mars → Sun → Venus → Mercury → Moon → Saturn |
| Friday | Venus | Mercury → Moon → Saturn → Jupiter → Mars → Sun |
| Saturday | Saturn | Jupiter → Mars → Sun → Venus → Mercury → Moon |
On a Sunday, for example, the horas from sunrise run Sun, Venus, Mercury, Moon, Saturn, Jupiter, Mars, and then repeat. The eighth hora is the Sun's again, and so is the fifteenth and the twenty-second.
Why the weekdays are in the order they are
Here is the elegant part. There are 24 horas in a day and seven planets in the cycle. Twenty-four is three sevens plus three, so each new day begins three steps further along the cycle than the last. Start on Sunday with the Sun. Count on 24 horas, and the 25th — the first hora of the next day — belongs to the Moon. That is Monday. Twenty-four more horas brings you to Mars: Tuesday. Then Mercury, Jupiter, Venus and Saturn.
The order of the seven days of the week, in India and in Europe alike, is simply the list of planets that rule the first hour of each successive day. The hora system is the origin of the week as we know it.
What each hora is traditionally used for
- Sun: matters involving authority, government and official applications
- Moon: travel, dealing with the public, domestic matters
- Mars: tasks needing courage, physical effort or technical skill — avoided for peaceable beginnings
- Mercury: study, writing, accounts, trade and communication
- Jupiter: generally auspicious — teaching, advice, finance, religious observance
- Venus: marriage matters, the arts, clothing, comforts and purchases
- Saturn: steady, long-term labour — avoided for new beginnings
In broad terms the horas of Jupiter, Venus, Mercury and the Moon are counted as favourable, the Sun as neutral, and Mars and Saturn as demanding.
How it fits with other timing methods
Hora answers a narrow question: which planet colours this hour? It does not replace the Panchang. A full muhurat is chosen first by the day — its tithi, nakshatra, yoga and weekday — and then narrowed to the best hours within that day, where hora, Choghadiya and the avoidance of Rahu Kaal all play a part.
Its practical appeal is that it gives several favourable windows every day, so there is nearly always a suitable hour close at hand for a small matter that does not justify a full muhurat.
Frequently asked questions
- What is hora in astrology?
- A planetary hour. The daytime and the night are each divided into twelve horas, every one ruled by one of the seven visible planets in a fixed repeating order that begins with the lord of the weekday at sunrise.
- Is a hora exactly one hour long?
- Only when day and night are equal. A daytime hora is one-twelfth of the time from sunrise to sunset, and a night hora is one-twelfth of the night, so their lengths change with the season and the latitude.
- Which hora is good for starting something new?
- The horas of Jupiter, Venus, Mercury and the Moon are traditionally considered favourable, with Jupiter's the most generally auspicious. The horas of Mars and Saturn are usually avoided for new beginnings.
- How is the first hora of the day decided?
- It is ruled by the planet of the weekday and begins at sunrise: the Sun on Sunday, the Moon on Monday, Mars on Tuesday, Mercury on Wednesday, Jupiter on Thursday, Venus on Friday and Saturn on Saturday.
- Does the Vedic day start at midnight?
- No. For hora, as for the Panchang generally, the day begins at sunrise. The hours between midnight and sunrise still belong to the previous weekday.
Work it out for yourself
These tools compute what this guide explains, from real astronomical positions.
- Panchang →City pages include the full day and night hora table.
- Choghadiya →The seven-window muhurat table for day and night.
- Sunrise & Sunset →The exact times every hora is measured from.
How this guide was written
The reference tables on this page are generated from the same data Astronaad’s calculators run on, so the guide and the tools cannot disagree. Where classical authorities differ, the text says so and names the convention Astronaad follows. Astrology is a traditional system of interpretation: nothing here is medical, legal or financial advice. Spotted an error? Tell us.