Ekadashi across the date line

A phone call between Auckland and Fremont, California, can carry one ekādaśī (एकादशी) fast and two dates. In 2026 the ekadashi that the calendars name Papankusha, the eleventh lunar day of its fortnight, falls in Auckland on Thursday 22 October and in Fremont on Wednesday the 21st. Both sheets are right, and neither household is following a different rule from the other. What took me a while to believe is that the two mornings which produce those two dates are three hours apart. The reversal is the part worth carrying into the rest of this piece: one lunar month earlier, when the two sheets agreed on a date and nobody on the call had any reason to think about it, the two mornings were nearly 20 hours apart. The date is the least reliable thing the two households exchange.

The first explanation anybody reaches for is the international date line, and the date line does almost none of the work. There is no line in the sky. Nothing in the moon's motion happens at 180 degrees of longitude, and the rule that names the day never once asks what date it is.

Here is that rule in a sentence, since another post owns it properly. A tithi (तिथि), a lunar day, is one step in the widening gap between the moon and the sun. It runs a little under one of our days, so it will not sit neatly inside a date, and the almanac settles which date carries a tithi's name by looking at a single minute: whichever tithi is running at local sunrise names the whole day. Ekadashi then asks a second question, about whether the tenth lunar day reaches into the dawn before it, and ekadashi, and why two dates circulate works that second question through on real sheets. Here it matters only as something to rule out. In October 2026 the eleventh is already running well before first light in both cities, so the sheets that watch the dawn window and the sheets that watch plain sunrise land on the same day as each other, in Auckland and in Fremont alike. What separates the two households is not doctrine. It is geography.

Two mornings, three hours apart

Start with the part both households share.

The eleventh tithi of that fortnight begins and ends at two instants in the solar system, and every almanac on earth works from that same pair. Auckland writes them as 9.41 on the evening of Wednesday 21 October and 10.17 on the evening of Thursday the 22nd. Fremont writes the very same two instants as 1.41 on the morning of Wednesday the 21st and 2.17 on the morning of Thursday the 22nd. The minutes past the hour are identical because that week Auckland's clocks run exactly 20 hours ahead of California's: New Zealand went onto daylight saving on 27 September, California stays on it until 1 November, and 20 whole hours leaves no half hour to complicate the reading.

I have followed a pair of instants like these before, through a Diwali in your festival, eight thousand kilometres later, where the moment being tested was an evening rather than a morning. Same two numbers for the whole planet either way.

Now the sunrises, which belong to each city alone.

In Fremont the sun comes up on Wednesday 21 October at 7.22. The eleventh has been running since twenty to two that morning and will not finish until the small hours of Thursday. Wednesday's sunrise sits well inside it. Wednesday takes the name, and the fast is Wednesday's.

In Auckland the sun comes up on Thursday 22 October at 6.28. The eleventh began at twenty to ten the previous evening and will not finish until the following evening. Thursday's sunrise sits well inside it. Thursday takes the name, and the fast is Thursday's.

Two sheets, two dates, and both cities with hours in hand on either side.

Now put those two sunrises on one clock. Fremont's Wednesday sunrise, 7.22 in the morning, is 3.22 on Thursday morning in Auckland. Auckland's Thursday sunrise, 6.28 in the morning, is 10.28 on Wednesday morning in Fremont. Whichever clock you read them on, the two mornings are 3 hours and 6 minutes apart.

That is the whole of it. The two households are not a day apart. They are three hours apart, and the calendar restarts in the ocean between them.

One thing the line does change, and it is worth knowing before somebody notices it and worries. The weekday travels with the civil date, not with the sunrise. Auckland's fasting day is a Thursday and Fremont's is a Wednesday, although the two mornings sit inside one stretch of three hours. So anything on the sheet that is picked by weekday, the rāhu kāla (राहु काल) box among them, is keyed differently in the two houses. Nobody has erred. The weekday is the one row where the bookkeeping line genuinely shows through.

The fortnight they share a date

Go back one lunar month and the same arithmetic gives the opposite result.

Parsva ekadashi, 2026. Auckland keeps it on Tuesday 22 September. Fremont keeps it on Tuesday 22 September. Same date, and this time nobody on the call has any reason to suspect that anything unusual is going on.

Put those two sunrises on one clock as before. Auckland's is at 6.11 on the Tuesday morning, Fremont's at 6.56 on the Tuesday morning, and between them lie 19 hours and 45 minutes.

Set the two months side by side. When the dates differ, the two mornings are close. When the dates agree, the mornings are nearly a day apart. The date written on the kitchen calendar tells you close to the opposite of what you would guess about how far apart the two of you are actually standing.

The reason is short. Between one California sunrise and the next, Auckland gets exactly one of its own, and it does not fall in the middle. It comes about three hours after the Californian one, which leaves nearly 21 hours until California's next. The two cities' mornings always arrive as a lopsided pair. A tithi runs a little under a full day, just short of the whole circuit, so it catches one of the two pairings and not both. If it catches the Auckland morning three hours after the Californian one, the two households write different dates. If it catches the Auckland morning that came nearly 21 hours earlier, they write the same one.

I worked every ekadashi through for these two cities from 2026 to the end of 2031. In 140 of them, both cities had a sunrise falling inside the eleventh, and 20 of those came out on the same civil date: about one in seven. Four more times in those six years, one city or the other had no sunrise inside the eleventh at all, which is a different question with a settled answer of its own.

What actually goes wrong on the call

Not the date. The date is easy to compare and easy to write down. What goes wrong is the word today.

In October, one household says the fast is today and the other says tomorrow, and the two fasting days overlap for almost 21 hours. In September both households say today, and their two todays overlap for about four. The month where the calendar makes them sound a day apart is the month they are nearly on top of each other, and the month where the calendar makes them sound identical is the month they are furthest apart. Anyone trying to keep a fast in step with a parent or a sibling on the other side of the ocean is being misled by the one piece of information the call always exchanges.

So swap it. The useful sentence is not a date. It is an hour with a city attached: my sunrise is at 6.28 on Thursday here, yours is at 7.22 on Wednesday there, and those are three hours apart.

That works for the end of the fast too, which is where the two households come closest. Breaking the fast is pāraṇa (पारण), and it happens the next morning inside a printed window. In Fremont that window runs from 8.14 to 9.35 on the Thursday morning. In Auckland it runs from 6.27 to 9.06 on the Friday. Read Fremont's window on an Auckland clock and it closes at 5.35 on that same Friday morning, 52 minutes before Auckland's opens.

Fifty-two minutes, across two dates and ten and a half thousand kilometres of water. If the two of you want to eat within the same hour, you can. Ring at half past six on your Friday morning. You will catch the other kitchen just as it finishes.