Kati Bihu

Significance and story

Kati Bihu is one of the three Bihu festivals observed in Assam, and it falls in the period when the Sun enters Tula (Libra). This solar ingress is the marker the panchang uses to fix the observance. The other two Bihu — the springtime Bohag Bihu and the harvest-time Magh Bihu — sit at different points of the agricultural year, and Kati Bihu occupies its own quiet place between them.

The deity associated with Kati Bihu is Tulsi, and by extension Lakshmi. The observance is centred on lamps lit in the paddy fields. At this time the paddy is young and standing in the fields, and the ritual of carrying light into the growing crop is the defining act of the day. It is a modest festival by design — less feasting and public celebration than the other two Bihu, and more a matter of attention to the field, the household tulsi plant, and the coming harvest.

The name Kati is linked to the Assamese month of Kati, which corresponds to this part of the solar year. Because the date is tied to the Sun's entry into Tula rather than to a lunar tithi alone, Kati Bihu is often described as a solar festival, and it is observed close to the time of the autumnal equinox period in the Hindu calendar.

How the date is fixed

Kati Bihu is observed on the day the Sun enters Tula (Libra). In jyotish this is a sankranti — a solar ingress — and it is calculated from the sidereal zodiac using the ayanamsha in force. The exact Gregorian date therefore shifts from year to year, and the page above lists the computed date for the current year rather than a fixed day.

Because the moment of ingress can fall at any hour, the observance may be assigned to the day on which the ingress occurs, or to the following day, depending on the convention followed and the location. This is why the date can appear to differ by a day between cities, and between calendars that reckon months from the new moon (amanta) and those that reckon from the full moon (purnimanta). Dates shown here are for New Delhi sunrise with Lahiri ayanamsha. Readers outside India, or in a different Indian city, may see a one-day variation; that is expected and not an error.

For personal observances tied to a specific muhurat, it is best to consult a qualified jyotishi with your own details, since the brief here covers the festival date and not individual timings.

Puja vidhi

The central act of Kati Bihu is the lighting of lamps in the paddy fields. Households and cultivators carry small lamps or earthen lights to the fields and place them there, and the same practice is extended to the household tulsi plant, which is tended and lit in honour of Tulsi and Lakshmi.

• Clean the tulsi plant and the area around it, and light a lamp there.
• Carry lamps to the paddy fields and place them among the standing crop.
• Keep the observance simple and steady; Kati Bihu is not marked by elaborate ritual.
• Offer prayers for the protection of the growing crop and for the household's wellbeing, without attaching any promise of a specific outcome.

Practices vary by family and village, and no single sequence is compulsory. What is consistent across accounts is the lamp, the field, and the tulsi.

Regional variations

Kati Bihu is primarily observed in Assam, and within Assam the emphasis and the details of the day can differ from district to district and from family to family. Some households focus on the tulsi plant at home, while cultivators give more attention to the lamps in the fields. The scale of the observance is generally smaller than that of Bohag Bihu or Magh Bihu.

Outside Assam, Kati Bihu is not widely observed as a public festival, though Assamese communities in other parts of India and in the diaspora may keep it in a modest form. Where traditions differ — in the choice of day when the ingress falls near a boundary, or in the extent of the field ritual — it is better to follow the practice of your own family and region than to treat one form as authoritative.

What to avoid

• Do not treat the date as fixed across all cities; check the computed date for your location and note the one-day variation that solar ingresses can produce.
• Do not expect the festival to promise health, wealth, marriage or legal outcomes. Kati Bihu is a seasonal observance, not a remedy.
• Do not substitute this page for personal guidance. For chart-specific questions, consult a qualified jyotishi.
• Do not assume a single uniform vidhi. Where customs differ, follow your own tradition and say so plainly rather than insisting on one version.