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Official national public holidays. Regional and religious observances may vary by area.

About Time in Egypt

In 2014, Egypt Changed Its Clocks Four Times in One Summer

Egypt's 2014 daylight-saving schedule produced a sequence that ordinary twice-a-year clock changes do not prepare people for. At midnight on May 16, clocks jumped forward from 00:00 to 01:00. Barely six weeks later, just before Ramadan, the change was reversed: when midnight arrived on June 27, clocks went back to 23:00 on June 26.

The interruption was deliberate. Summer time was suspended during Ramadan, then restored at midnight on August 1, when 00:00 became 01:00 again. Finally, on September 26, the country moved back to standard time. Four national clock changes had therefore occurred between May and September: forward, backward, forward, backward.

The episode was not simply an odd technical footnote. Transport timetables, computer systems, broadcast schedules and international appointments all had to follow an offset that changed, changed back for a religious month, resumed, and then ended again.

Egypt later abandoned seasonal clock changes for several years. Law No. 24 of 2023 brought them back under a much simpler rule: the statutory clock is advanced by 60 minutes from the last Friday of April until the end of the last Thursday of October each year.

At the Rawda Nilometer, the Nile Was Read Day by Day Before the Harvest Was Known

For much of Egyptian history, the crucial clock was not mounted on a wall. It was the rising river. The surviving Nilometer on Rawda Island in Cairo was built in 861 CE around a measuring column 19 cubits long, connected to the Nile so that the changing water level could be read inside the structure.

Those readings had consequences far beyond hydrology. Flood height helped officials judge whether fields would receive enough water, prepare canals and dykes, estimate agricultural productivity and determine taxation. Too little water threatened poor crops; too much could inundate settlements and fields.

Historical descriptions show how closely the flood was followed. Inspectors could record the rise every day rather than waiting for the eventual high-water mark. An account preserved by later sources describes the Nile as rising for roughly forty days and falling for another forty. The useful information was therefore not just a maximum level but a moving sequence: how fast the river was climbing, when it approached a critical height and when the decline began.

The seasonal pattern was remarkably important before modern dams altered it. The rise generally became noticeable in summer and approached its highest stage toward late August and September. Agricultural planning, food expectations and public administration were synchronized to a river whose annual pulse unfolded over weeks.

A Karnak Clock Had to Change the Length of an Hour as the Seasons Changed

One of the earliest surviving Egyptian water clocks comes from the reign of Amenhotep III in the fourteenth century BCE. Found at Karnak, the alabaster vessel measured the night as water escaped slowly through a small opening near its base.

Its design exposes a very different idea of an hour. Egyptians divided both daylight and night into twelve parts, so a nighttime hour was not a fixed 60 minutes. Long winter nights produced longer night hours; short summer nights produced shorter ones. A clock that worked through the year therefore had to account for the season.

The Karnak vessel did exactly that. Month labels around its rim correspond to separate vertical hour scales inside. As the water level fell, the appropriate seasonal scale indicated the progress of the night. Modern analysis of Egyptian outflow clocks suggests that such devices could achieve useful accuracy despite the difficult requirement of measuring hours whose duration itself changed during the year.

Egypt's 365-Day Calendar Slowly Pulled Its Own Seasons Out of Season

The ancient civil year was beautifully regular: twelve months of 30 days followed by five additional days, making 365. What it lacked was the extra quarter-day contained in the solar year.

That small difference accumulated. The calendar slipped by about one day every four years relative to the seasons. A festival fixed to an official date did not remain fixed to the same point in the agricultural or solar year. Given enough centuries, months associated by name or tradition with one season could occur in a completely different part of the natural cycle.

Evidence from Egyptian festival calendars suggests that officials did not continually move fixed festivals to compensate. Ceremonies tied to the 365-day civil calendar could therefore drift while the Nile flood and solar seasons continued on their astronomical schedule. Egypt effectively maintained two kinds of temporal order at once: an administratively stable sequence of numbered days and a natural year that slowly moved underneath it.

A later Alexandrian reform solved the accumulated-calendar problem by adding an extra day every four years. That leap-day structure survives in the Coptic calendar, which retains the old pattern of twelve 30-day months followed by a short final period, with a sixth additional day in leap years.

Thirty-Six Star Groups Turned the Egyptian Night into a Celestial Clock

Long before mechanical clocks, observers could estimate the progress of the night by watching which stars appeared over the horizon. Egyptian diagonal star tables preserve an unusually systematic version of that method.

The surviving tables are arranged around 36 star groups known as decans. Successive decans were associated with roughly ten-day intervals through the year, while their changing appearances during the night were used to mark a sequence of twelve night hours. Some of the best-known tables were painted inside coffin lids during the Middle Kingdom.

They were not simple star maps. The grid connected two different cycles: the passage of hours during a single night and the progression of days across an entire year. As the season advanced, a different sequence of decans occupied the hourly positions. The sky itself supplied both the moving hands and the seasonal correction.

Sirius had a particularly important place in this system of observation. Its heliacal rising, its first visible appearance shortly before sunrise after a period of invisibility, was associated with New Year and with the approach of the Nile inundation. A dawn observation could therefore connect an event lasting only minutes with the turning of the annual cycle.

At Sunset in Ramadan, Cairo Still Uses a Cannon as a Time Signal

During Ramadan, the end of the daily fast is determined by sunset, and Cairo developed one of the loudest ways imaginable to announce that moment. A cannon fired at the time of the sunset prayer became a public signal that the day's fast had ended.

The precise origin is uncertain. Cairo's own official historical accounts preserve competing stories, including one placing an accidental sunset firing in the fifteenth century and another connecting the custom with the nineteenth-century reign of Khedive Ismail. The disagreement matters: the tradition is well established, but the familiar story of exactly how it began cannot be treated as a securely documented single event.

The Citadel cannon eventually fell silent in 1992. Nearly three decades later it was restored and fired again during Ramadan, timed once more to the moment of sunset. Modern Cairo has phones, radio, television and astronomical calculations accurate to the second, yet an explosive acoustic signal still marks one of the city's most important daily boundaries for one month each year.

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