Yajur Upakarma 2026: 27 or 28 August

Two texts give two answers. The Calendar Reform Committee's criterion gives 27 August; the Dharmasindhu's Taittiriya clause gives 28 August.

Avani Avittam falls on the Shravana full moon. In 2026 that full moon straddles two sunrises, and the two texts we have read resolve the straddle differently.

The astronomy, first

The 2026 Shravana purnima runs from 09:09 on 27 August to 09:49 on 28 August. So it is current on both mornings: 3.56 muhurtas after sunrise on the 27th, and 4.35 muhurtas past sunrise on the 28th.

Both days have a claim. Everything depends on which test you apply.

The Calendar Reform Committee's criterion

The Report gives the South Indian criterion in one sentence: the purnima should be current for over twelve ghatikas. In 2026 it is current for 52.6 ghatikas after sunrise on the 27th and 9.0 on the 28th.

By that test the day is 27 August, which is what Drik prints.

The Dharmasindhu's Taittiriya clause

The Dharmasindhu sets thresholds in muhurtas and then adds a clause for the Taittiriyas — the South's Yajurvedins, the Apastamba, Bodhayana and Hiranyakeshi schools. Where the second day carries two to five muhurtas, the Taittiriyas take the later day and other Yajurvedins the earlier.

2026 gives 4.35 muhurtas on the 28th, inside that band. By this reading the Taittiriyas take 28 August.

What we do, and what we are not claiming

We follow the Report, so we give 27 August, and we keep the Dharmasindhu reading on the page rather than deleting it.

We are not telling you the Dharmasindhu is wrong. The conflict is between two texts, both read from the page, and if your family follows a Taittiriya sutra the second reading is the one that describes your practice. A site that printed one date without mentioning the other would have hidden the only part of this that matters to you.