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Did You Know?

Egypt Invented the 24-Hour Day, Then Let Its Calendar Wander for 1,460 Years

Egypt distributes roughly 250 to 270 million loaves of subsidised bread every day.

The entitlement is five loaves per person per day, drawn on a government smart card, and it reaches around two-thirds of the population — somewhere between 66 and 70 million people.

The bread is aish baladi, and the word matters. In most Arabic-speaking countries bread is khobz. In Egyptian Arabic it is _aish_ — which means "life."

The economics are extraordinary. From 1989 until June 2024 the price of a subsidised loaf was held at five piastres — about a tenth of a US cent. Thirty-five years without an adjustment, through devaluations, wars and global grain shocks. When it finally rose, it went to twenty piastres, still leaving beneficiaries paying roughly 16% of what the loaf costs to produce; the state covers the other 84%.

The bread programme alone consumes about 9 million tonnes of wheat a year — around 3.5 million grown at home and 5.5 million imported, which is a large part of why Egypt is often the world's biggest wheat importer. The 2024/25 budget allocated roughly EGP 125 billion to it.

Egyptians eat about 180 kilograms of flour per person per year. The comparison figure offered by the head of the state grain authority for other countries was at most 80.

This has never been only about food. In January 1977 an attempt to cut subsidies produced two days of nationwide protest and was reversed. In 2011 the demand was for bread, freedom and social justice, in that order.

A fixed number, held for generations, with the drift absorbed by everything around it. Cairo has been doing that for a very long time.

Look at a clock. The reason it has 24 hours on it rather than 18, or 36, or 10, is a decision made on the Nile several thousand years ago.

Egyptian astronomers divided the sky into 36 star groups, which the Greeks later called decans. Each decan rose about ten days after the last. Priests used them as a night clock: by watching which decan was climbing the horizon, you could tell the hour. Twelve decans were visible across a full night — so the night got twelve hours. The day got twelve to match. That is where the 24-hour day comes from, and it has never been revised since.

The same system produced the calendar. The Egyptian civil year had 365 days: three seasons — Inundation, Emergence, Harvest — of four thirty-day months each, giving 360, plus five extra days stitched onto the end and dedicated to the birthdays of five gods. Each month broke into three ten-day decans. Under the New Kingdom, temple records show the last two days of each decan were rest days for royal craftsmen, which is about as close to a weekend as the Bronze Age got.

Egyptian hours were originally temporal — the twelve daylight hours were longer in summer and shorter in winter, because they had to divide however much daylight there actually was. Fixed-length hours came later.

The clock: here is the flaw, and it is a magnificent one.

The Egyptian civil year had no leap day. Not one, ever. So it ran about a quarter of a day short of the true solar year, every year, without correction.

The consequence is that the calendar slid backwards through the seasons continuously. New Year's Day and the actual heliacal rising of Sirius — the event the year was originally built around — realign only once every 1,460 years. A festival of the harvest could arrive in the middle of the flood, and eventually did.

In 238 BC, the Canopus Decree, issued by a synod of priests in honour of Ptolemy III, ordered a sixth day added to the intercalary days every fourth year. The reform never took hold.

So Egypt invented the framework the entire planet still runs on, and then declined, for centuries, the one correction that would have kept it pointing at the sun.