What we don't know

Published in full, because a calendar that only tells you what it is sure about is not telling you enough.

No religious authority has reviewed this site

We have prepared a review package. Nobody has signed it. Everything here is calculation and description, not religious ruling. We do not tell you what Ekadashi means, what to eat, or what merit it carries — because we are not qualified to.

Our Gaudiya rules follow one lineage

They are validated against the ISKCON/GBC calendar tradition. We have not checked them against Sri Vaishnava, Madhva, Vallabha, Nimbarka or Swaminarayan practice, each of which may reckon differently. If you follow one of those, your temple's calendar is the authority, not this site.

Four Mahadvadashis are not implemented

Jaya, Jayanti, Vijaya and Papanashini depend on nakshatra combinations we have not implemented. Where one may apply, we flag it rather than pretend otherwise.

One Parana rule is inferred, not sourced

When Hari-vasara outlasts the preferred window we fall back to Aparahna. This reproduces published times, but we reconstructed the rule from agreement rather than reading it in a source. It affects about 15% of Smarta Parana windows, and we mark it wherever it applies.

We do not publish above about 65 degrees north

Where the sun does not rise normally, "the tithi at sunrise" has no answer we can defend. Rather than guess, we decline.

Our checks are against two publishers

Mostly Drik Panchang, plus the ISKCON calendar. Agreeing with them is evidence, not proof.

Parana windows can be very short

About 4% of Smarta Parana windows are under 30 minutes. The shortest we have computed is 12 seconds. In a handful of cases no valid window exists at all under the rule we apply; when that happens we say so rather than invent a time.