Night shift, day fast, the gist

Night shift, day fast

Indian fasts are named after whichever lunar day is running at the minute the sun comes up, so a night-shift worker is often awake for the one minute that decides the date and asleep for most of the day it names, and it is the timed windows around the fast, not the naming rule, that have to be worked out.

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

The sheet gives you the fast day and also a window for ending it. For one ekadashi this August that window is 2 hours and 13 minutes long, from 5.47 to 8.00 in the morning, which for a lot of people is exactly the bus home.

Most Indian observances are pinned to a lunar day, called a tithi, rather than to a date. A tithi is one step in the widening gap between the moon and the sun. It runs a little under 24 hours, so it does not line up with our dates: it starts on one afternoon and ends the next evening.

The almanac therefore needs a rule for deciding which of our dates carries which tithi's name. The rule takes one minute. Whichever tithi is running when the sun comes up gives the whole day its name.

That rule asks for an instant, not for a person. It does not care whether you were awake, so somebody working nights has the same date as everybody else.

In fact they are often the one person in the house awake at that minute. Work seven at night to seven in the morning in Delhi and the sun comes up inside your shift in every month of the year. What you sleep through is the day the sunrise just named.

The trouble is everything that has a length rather than a moment. Take ekadashi, the eleventh lunar day, which many households fast on. The fast is not over at bedtime. It is broken the next morning inside a printed window, called parana. For Kamika ekadashi in 2026 the Delhi sheet gives that window as 5.47 to 8.00 on Monday 10 August. It opens at sunrise and shuts when the twelfth lunar day runs out. Come off a shift at seven and you may be through your door with minutes to spare, or not at all.

The rule already carries a get-out for a window that will not work: if the twelfth is over before sunrise, you break the fast after sunrise anyway. In London that morning the twelfth ends at 3.30, two hours before the sun comes up.

Beyond that, households improvise, and always have. Publishers already print two ekadashi lists that can fall a day apart, and Sanskrit writers have argued about which day an observance belongs to for four hundred years.

Words decoded

vrat (व्रत): a religious observance, usually including a fast, kept on a particular day
tithi (तिथि): a lunar day, one step in the moon's separation from the sun, not a day of the clock
panchang (पञ्चाङ्ग): the printed Indian almanac sheet, computed for one named city, listing each day's measurements
udaya tithi (उदय तिथि): the "risen" tithi, the one running at sunrise, which gives the day its name
ekadashi (एकादशी): the eleventh lunar day of each fortnight, widely kept as a fast day
dwadashi (द्वादशी): the twelfth lunar day, the one the fast is meant to be broken inside
parana (पारण): the act of breaking a fast, and the window of time the sheet prints for doing it
hari vasara (हरि वासर): the first quarter of the twelfth, which is let pass before the fast is broken
Smarta and Vaishnava: two traditions within Hinduism whose printed fast lists can fall a day apart

Why anyone should careNurses, drivers and night-shift office crews are told, usually by nobody in particular, that keeping a fast properly is not really possible on their hours. The naming rule says otherwise: it is settled by the sky and sleeping through a sunrise does not disturb it. What genuinely needs deciding is small, specific and can be settled once at a kitchen table, in daylight, with the roster and the almanac side by side.

Read it properly, 7 min Night shift, day fast