Hora

Hora (hora) — a planetary hour: one of the 24 parts into which a day is divided from one sunrise to the next. The word is traditionally traced to "ahoratra" (a full day, "day-and-night"). Each hora is ruled by one of the seven grahas, the rulers changing in a fixed Chaldean cycle. The same word in jyotish also names the D-2 varga (hora chakra) and predictive astrology itself (hora-shastra); here it means only the planetary hour.

Place in the system

A day divides into 24 horas: 12 day horas (from sunrise to sunset) and 12 night horas (from sunset to the next sunrise), each half into 12 equal parts. So a hora is usually shorter or longer than an astronomical hour and changes in length with the day's length; day and night horas are, as a rule, unequal to each other. Hora is not the same as muhurta: muhurta divides a day into 30 parts — 15 day and 15 night, about 48 minutes each at the equinox; hora divides the same halves into 12 parts each, that is, into 24 parts a day.

The rulers of the horas follow a fixed Chaldean cycle — Sun, Venus, Mercury, Moon, Saturn, Jupiter, Mars — repeating in a circle through all 24 horas in a row. The first hora of the day, right after sunrise, belongs to the graha that rules the vara of that day; this fact is what determines the order of the days of the week itself.

The ruling planet of a hora sets its character:

• Sun — leadership, authority, triumph.
• Moon — receptivity, softness, nourishment.
• Mars — energy, resolve, action.
• Mercury — communication, trade, learning.
• Jupiter — knowledge, spirituality, growth.
• Venus — love, beauty, art.
• Saturn — patience, discipline, hard work.

Practical meaning

The hora background works through the quality of its ruler. Jupiter's hora is favourable for spiritual practice and study; Mars's for decisive action; Venus's for creativity and relationships; Saturn's for laborious work.

Hora is taken as a refinement of an already-chosen day within the larger limbs of the panchanga: for negotiations, Mercury's hora; for creative work, Venus's; for study, Jupiter's. Major muhurtas — a wedding, a move, laying a foundation — are not chosen by hora alone: they are worked out by tithi, nakshatra, and the day's other limbs, and hora only refines the moment within an already-chosen window.

In the calculation the bot uses, a hora is 1/12 of daylight or 1/12 of darkness, and its length changes with the season. Some schools instead take a fixed 60 minutes from sunrise — worth keeping in mind when checking against other sources.

In daily practice

Hora is a unit of planetary time within the day. If the panchanga shows "now in Mercury's hora," that means the current one of the 24 horas is ruled by Mercury, and the time favours communication, trade, learning.

The ruling planet's hora also suits important decisions: if you want to make a decision that calls for wisdom, choose Jupiter's hora; for resolve, Mars's; for subtlety, the Moon's.

Hora also suits planning the day's rhythm: matters that call for different qualities can be spread across horas, matching their rulers.

Hora is only a layer within the day. How favourable the day itself is for you personally is shown by Tara Bala from your birth nakshatra; it does not divide down to individual horas.