A hora is a planetary hour: the day from sunrise is divided into 24 of them, each ruled by one of the seven planets in the fixed order Sun, Venus, Mercury, Moon, Saturn, Jupiter, Mars. The first hora after sunrise belongs to the lord of that weekday, which is where the weekday names come from. Enter your date and city to see the full 24-hora timeline computed from your local sunrise, with the hora running right now highlighted.
In Vedic astrology (Hora Shastra), each day is split into 24 planetary hours called horas that run in a fixed cycle - Sun, Venus, Mercury, Moon, Saturn, Jupiter, Mars - repeating through day and night. The first hora after sunrise is ruled by the lord of that weekday (Sun on Sunday, Moon on Monday, and so on), and every hora carries the nature of its ruling planet.
That cycle is the descending order of the classical orbital periods, and it is also why the weekdays follow the order they do: count seven horas on from the Sun's and you land on the Moon, the lord of the next day. Twenty-four horas advance the cycle by three places, which is exactly the step from one weekday lord to the next.
Match the hora's ruling planet to the task you have in mind:
The match to make is between the nature of the ruling planet and the nature of the work, not between the hora and any particular date. Since the same seven planets repeat every seven horas, the one you want comes round roughly twice in a working day, so there is usually more than one usable window.
The first hora begins at your city's true sunrise for the date you choose, and each hora here is a fixed 60 minutes, so the twenty-four of them span one full day to the next sunrise. Sunrise itself is computed for your latitude, longitude and time zone, which is why the same hora starts at a different clock time in Delhi and in Chennai on the same date. There is a second convention in circulation, in which each hora is one twelfth of the actual daylight and one twelfth of the actual night, so its length changes with the season; this page uses the fixed-hour reckoning.
The table marks each hora benefic, neutral or malefic: Jupiter, Venus, Mercury and the Moon are shown as benefic, the Sun as neutral, and Mars and Saturn as malefic. On dates and latitudes where the Sun does not rise or set at all, the hora table cannot be built and the page says so instead of showing an approximated day - a hora is a division of the real day, and a made-up sunrise would produce a different quantity wearing the same label.
On this page each hora is exactly 60 minutes, and the twenty-four of them start at your city's true sunrise and run to the next one. Because sunrise shifts with your location and the season, the clock time at which any given hora begins depends on your city and date. A second convention exists in which a hora is one twelfth of the actual daylight or night and therefore changes length with the season; this page uses the fixed-hour reckoning.
The Jupiter (Guru) hora is generally considered the most auspicious for worship, learning and financial matters, while the Venus hora suits marriage and the arts. The Saturn hora is usually avoided for new beginnings. This page marks Jupiter, Venus, Mercury and Moon horas as benefic, the Sun hora as neutral, and Mars and Saturn horas as malefic.
The first hora after sunrise is always ruled by the lord of that weekday - Sun on Sunday, Moon on Monday, Mars on Tuesday, and so on. From there the seven planets follow in their fixed cyclic order (Sun, Venus, Mercury, Moon, Saturn, Jupiter, Mars) for the rest of the day and night.
Because 24 horas do not divide evenly by seven. Starting from the Sun's hora at sunrise, the twenty-fifth hora - the first of the next day - falls three places along the cycle, which lands on the Moon. Repeat that and you get Sun, Moon, Mars, Mercury, Jupiter, Venus, Saturn: the order of the weekdays.
It works wherever the Sun genuinely rises and sets on the date you choose. At high latitudes during polar day or polar night there is no sunrise to anchor the first hora to, and the page reports that the table cannot be computed rather than inventing a 06:00 sunrise - the hora is a division of the real day, so a fabricated one would not be an approximation of it.
For educational purposes. Astrological interpretations are traditional and not a substitute for professional advice.