Ekadashi, and why two dates circulate, the gist

Ekadashi, and why two dates circulate

The most widely kept Hindu fast falls on the eleventh lunar day, and two traditions check whether that lunar day is clean at two different minutes of the morning, which is why calendars sometimes print two dates for one fast.

This is the short way in. The essay has the working, the sources and the sky.

One tradition looks at the sky the instant the sun comes up. The other looks 96 minutes earlier, while it is still dark. Most months they see the same thing. When they do not, two neighbours fast a day apart, and neither of them is wrong.

Indian calendars run on lunar days, called tithis. A tithi is a stage in the widening gap between the moon and the sun, not a block of clock time, so it is a bit longer or shorter than one of our days and it drifts across our dates. Ekadashi is the eleventh lunar day. It comes round twice a month, and many households fast on it.

Nearly everything on an Indian almanac is dated by one test: whichever tithi is running at sunrise gives that whole day its name. Ekadashi uses that test, and then adds a second one.

The second test is about the tenth lunar day. The eleventh is not supposed to be mixed with the tenth. If the tenth is still around when you check, that day is set aside and the fast moves. Everybody agrees on the rule. They disagree about when to check.

Households in the ordinary tradition, labelled Smarta on calendars, check at sunrise. Households in the devotional traditions centred on Vishnu, labelled Vaishnava, check earlier, during a stretch of dawn called arunodaya. Most sources put that stretch at 96 minutes before sunrise, though some say 72.

Here is a real case. In Delhi on Friday 10 July 2026, the eleventh lunar day began at 08:16 in the morning and ended at 05:22 the next morning. The sun rose at 05:31 on the Friday and 05:32 on the Saturday. So the eleventh began after one sunrise and finished before the next, and neither day was named after it. Smarta households fasted on the Friday, the day the eleventh actually ran through, even though the calendar calls it the tenth. Vaishnava households could not use Friday, because the tenth filled the whole of Friday's dawn, so they fasted on the Saturday, which the calendar calls the twelfth.

Notice what neither side does. Neither will keep the eleventh on a day owned by the tenth. When these rules have to slide, both slide forwards.

Which line is yours is not something arithmetic can settle. It is a family question, answered long ago in most houses.

Words decoded

tithi (तिथि): a lunar day, measured by the widening gap between moon and sun rather than by the clock
ekadashi (एकादशी): the eleventh lunar day of a fortnight, kept as a fast in many households
dashami (दशमी): the tenth lunar day, the one just before ekadashi
dvadashi (द्वादशी): the twelfth lunar day, the one just after, on which the fast is normally broken
panchang (पञ्चाङ्ग): the printed Indian almanac that lists all of this, day by day
Smarta (स्मार्त): the ordinary householder tradition, following the remembered texts; its calendars judge ekadashi at sunrise
Vaishnava (वैष्णव): Hindu devotional traditions centred on Vishnu; their calendars judge ekadashi at dawn, before sunrise
arunodaya (अरुणोदय): the first light before sunrise, usually reckoned as the 96 minutes before the sun appears
vedha (वेध): a piercing; the word for one lunar day touching the next when it should not
parana (पारण): the meal that breaks the fast, taken the following morning within set hours

Why anyone should careTwo dates on one page look like a mistake, and families argue as though somebody has been careless. Nobody has. Both dates come from written rules that are centuries old, and the only real question is which rule your own household inherited. Knowing that turns an argument into a short conversation with an elder.

Read it properly, 7 min Ekadashi, and why two dates circulate