Horai timings explained: planetary hours, and the two ways to count them

A hora (horai in Tamil) is a planetary hour. The daylight, from local sunrise to local sunset, is divided into twelve equal horas, and the night into another twelve. Each hora is ruled by one of the seven classical planets, in a fixed repeating order, starting with the planet that rules the weekday. A hora is one clock hour long only when day and night are equal, near the equinoxes; the rest of the year daytime horas are longer or shorter than an hour.

The Nalla Neram pages show the horai for each city alongside the Gowri periods, for example horai in Kuala Lumpur and horai in Singapore.

The planetary sequence

The order is:

Sun → Venus → Mercury → Moon → Saturn → Jupiter → Mars → (back to Sun)

This comes from the old ordering of the planets by apparent speed, slowest first: Saturn, Jupiter, Mars, Sun, Venus, Mercury, Moon. Start that list at the Sun and wrap round, and you have the hora sequence. It continues without a break from day into night and from night into the next day.

The first hora after sunrise is ruled by the weekday's own planet: the Sun on Sunday, the Moon on Monday, Mars on Tuesday, Mercury on Wednesday, Jupiter on Thursday, Venus on Friday and Saturn on Saturday. In fact the weekday names come from this system. Twenty-four horas take the sequence round three full cycles and three steps more, which is why each day's first hora lands on the next planet in the weekday order.

A worked example: Calgary, Saturday 17 October 2026

Sunrise is 08:04 and sunset 18:37, a day of 633 minutes.

• One daytime hora: 633 ÷ 12 = 52.75 minutes
• First hora (Saturday): Saturn

The twelve daytime horas, rounded to the minute:

• 08:04–08:57 Saturn
• 08:57–09:50 Jupiter
• 09:50–10:42 Mars
• 10:42–11:35 Sun
• 11:35–12:28 Venus
• 12:28–13:21 Mercury
• 13:21–14:13 Moon
• 14:13–15:06 Saturn
• 15:06–15:59 Jupiter
• 15:59–16:52 Mars
• 16:52–17:44 Sun
• 17:44–18:37 Venus

These are worked from sunrise and sunset to the minute. The site works from the second, so its table can differ from hand arithmetic by a minute here and there.

The sequence carries on into the night, so the first night hora is Mercury, followed by the Moon, Saturn and so on. Each night hora is one-twelfth of the time from 18:37 to Sunday's sunrise, and in mid-October in Calgary that is longer than an hour, because the night is longer than the day. Count all 24 and the next sunrise opens with the Sun's hora, as it should on a Sunday.

What each hora is traditionally used for

The associations below are the ones commonly given in Tamil and wider Indian practice. They are traditional, and almanacs vary in the details.

• Sun (Surya horai): dealings with government, officials and superiors; matters of authority. Not usually chosen for auspicious beginnings.
• Moon (Chandra horai): travel, meeting people, domestic matters; widely treated as good for general beginnings.
• Mars (Sevvai horai): land and property matters, physical work, disputes; avoided for marriage and auspicious ceremonies.
• Mercury (Budha horai): study, writing, communication, accounts and trade.
• Jupiter (Guru horai): the most favoured; ceremonies, education, religious matters, finance and most auspicious beginnings.
• Venus (Sukra horai): marriage-related matters, arts, clothes, jewellery and vehicles.
• Saturn (Sani horai): labour, repairs, and matters involving iron or oil; avoided for new auspicious work.

In Tamil usage the Guru, Sukra, Budha and Chandra horai are generally counted as favourable, and Surya, Sevvai and Sani as unfavourable for new beginnings.

Proportional or fixed-hour: the two methods

This is the main reason two horai charts for the same city disagree.

The proportional method divides the actual daylight and the actual night into twelve parts each, as above. This is the classical method, it follows the Sun through the seasons, and it is what the site uses.

The fixed-hour method, found in some Tamil almanacs and apps, starts at sunrise and simply counts 60-minute horai: the first hour after sunrise, the second hour, and so on through all 24. It is easier to print and to compute in one's head.

Near the equator the two methods barely differ, because day and night are close to twelve hours each throughout the year. That is part of why the fixed-hour version is comfortable in Chennai, Singapore and Kuala Lumpur.

Away from the equator they part company quickly. In the Calgary example the fixed method would put the twelfth daytime horai at 19:04–20:04, well after sunset at 18:37, and by mid-afternoon it is already more than 40 minutes out of step with the proportional table. In a London or Toronto midsummer, when daytime horas run well over an hour, the drift is larger still.

Neither method is a mistake; they are different conventions. If you follow a family almanac that uses fixed hours, keep using it consistently. If you are comparing charts, check which method each one uses before deciding one is wrong.

How horai is used in practice

Horai is typically the last and finest layer of timing. A family might choose the day from the panchang, narrow it to a Nalla Neram window from the Gowri table, and then pick a favourable horai within that window. For small, everyday matters, such as when to make a call, set out on a drive or sign a routine form, some people use horai on its own.

As with any of these timing tools, it is a refinement, not a guarantee. It does not account for the tithi, the nakshatra or the birth chart of the person concerned. For a fuller view, see what muhurta can and cannot tell you and Nalla Neram vs Abhijit muhurat.

Frequently asked questions

Is a hora always one hour?

No. In the classical method it is one-twelfth of the day or of the night, so it equals sixty minutes only when day and night are equal. In Calgary on 17 October 2026 each daytime hora is about 53 minutes.

Which horai is best?

Guru (Jupiter) horai is traditionally the most favoured, followed by Sukra, Budha and Chandra. Surya, Sevvai and Sani are avoided for new beginnings.

Why does my almanac's horai differ from this site?

Most likely it uses fixed 60-minute horai from sunrise, or it was computed for a different city. The site uses the proportional method for the city you select.

Does the horai sequence restart at sunset?

No. The night continues the same planetary order from where the day left off. It is the day's first hora that is fixed, by the weekday.