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About Time in Bulgaria

Thirteen Calendar Dates Vanished in the Spring of 1916

Anyone reading a Bulgarian document from early 1916 has to watch not only the hour but the calendar itself. Bulgaria was still using the Julian calendar when parliament approved a move to the Gregorian system during the First World War. The last civil date under the old system was 31 March 1916. The following morning was not called 1 April. It was 14 April.

No physical days disappeared, of course. What vanished were thirteen date labels, 1 through 13 April 1916, because the Julian and Gregorian calendars were thirteen days apart in the twentieth century. The weekday sequence continued normally while the date number jumped forward. Bulgarian National Bank historical research describes the reform as part of an effort to standardize the calendar with Germany and Austria-Hungary, Bulgaria's wartime allies, while contemporary arguments for the law also emphasized alignment with the calendar already used across much of Western Europe.

The change creates a real problem for historical chronology. A Bulgarian event dated 20 March 1916 in a contemporary document is not the same day as 20 March 1916 in a country already using the Gregorian calendar. Researchers dealing with births, military records, newspapers or correspondence around the reform have to know whether a date was recorded in old style or new style rather than silently applying today's calendar backward.

The reform also explains why apparently contradictory dates can both be correct in biographies of people who lived across the transition. A date preserved from a pre-1916 Bulgarian source may later be restated in Gregorian form thirteen days later. Calendar conversion is therefore not editorial decoration in this period. It is part of establishing when an event actually occurred.

At 03:00 in 1942, Sofia Went Back to 02:00

Another chronological discontinuity appeared during the Second World War, this time inside a single night. The current IANA reconstruction places Sofia on Eastern European Time, two hours ahead of Greenwich, until 2 November 1942. When the local clock reached 03:00, it was turned backward to 02:00 and the country moved onto Central European Time, UTC+1. The hour from 02:00 to 02:59 therefore occurred twice.

This was a change of base time zone, not an ordinary autumn daylight-saving adjustment. The following year brought another layer. On 29 March 1943 clocks advanced from CET to Central European Summer Time, restoring a UTC+2 clock reading for the summer, then returned to CET on 4 October. A similar seasonal cycle occurred in 1944.

The sequence ended on 2 April 1945. At 03:00 CET the clock advanced by an hour and Bulgaria returned to Eastern European Time, UTC+2. The wartime chronology therefore contains repeated and missing local hours produced by two different mechanisms: a change of standard zone and seasonal summer time. A timestamp such as 02:30 on 2 November 1942 is intrinsically ambiguous unless its offset or some other context is known.

Seasonal clock changes later disappeared for more than three decades. They were introduced again by Council of Ministers Decree No. 6 of 1979. That first postwar season began in an unusual way: at 23:00 on 31 March the clock advanced directly to 00:00 on 1 April. Bulgaria now uses Eastern European Time in the standard period and Eastern European Summer Time during the seasonal interval defined by the European rules incorporated in the IANA zone record.

A Clock Tower Could Stop a Craftsman from Working Too Long

Long before national time zones, Bulgarian towns had another reason to care about synchronized clocks: competition between workshops. The Etar open-air ethnographic museum describes the clock towers of eighteenth-century craft and commercial centers as instruments for defining the beginning and end of the working day. Guild authorities wanted shops and workshops to follow the same hours so that one craftsman could not gain an advantage simply by opening earlier or closing later.

Gabrovo provides an unusually clear example. In 1828 local residents decided to build a clock tower where its signal could be seen and heard from the main commercial street. The municipal historical account explicitly connects the choice with simultaneous opening and closing of workshops and shops. Three wealthy citizens and a tax collector arranged to purchase the mechanism from a craftsman in Kazanlak for 2,150 groschen. Construction was delayed by the Russo-Turkish War of 1828 to 1829, and the tower was finally completed in 1835 with local money and voluntary labor.

The architecture itself reflected local urban conditions. Etar notes that in Western and Central European cities large clocks were often installed on town halls or church towers. Bulgarian craft centers frequently lacked an equivalent public building suited to the purpose, so a freestanding tower was erected specifically to carry the mechanism and bell. The result was a piece of urban infrastructure devoted almost entirely to making one agreed time visible and audible.

These towers were therefore more than picturesque monuments. Their bells converted mechanical time into a social rule that could reach an entire marketplace without requiring every worker to own a watch. In a craft economy organized through guilds, knowing the hour and ensuring that everyone else knew the same hour were two parts of the same problem.

Clouds over Bulgaria Put an Eclipse Expedition into an Aircraft

The total solar eclipse of 15 February 1961 crossed the country from west to east. NASA gives a global maximum duration of 2 minutes 45 seconds, while a later scientific analysis by Bulgarian astronomers gives about 106 seconds of totality for Sofia. The umbral path crossed the capital and continued through areas including Vratsa, Pleven, Tarnovo, Ruse and Varna.

For astronomers on the ground, the weather was poor. Bulgarian researchers had organized several observing teams, but cloud cover threatened much of the planned work. One group responded by taking the experiment above the clouds. Marin Kalinkov and colleagues observed the eclipse from an aircraft, an approach later described by the Bulgarian Academy of Sciences solar research group as one of the early successful European attempts to use an airplane in eclipse observation with the intention of extending the useful interval of totality.

The surviving material was substantial enough for later quantitative analysis. Researchers reported seven photographic plates obtained by V. Kussev and another five photographs made by Kalinkov with an Exacta-Varex camera. The images were intended for investigation of the shape and structure of the solar corona, a region normally overwhelmed by the brightness of the solar disk and exposed naturally during totality.

Decades later, those plates were digitized and measured with a Joyce-Loebl automatic microdensitometer at the National Astronomical Observatory at Rozhen. The episode is a good example of why eclipse astronomy is fundamentally a timing problem. The Moon's shadow would not wait for the clouds to clear, so the observers changed altitude and position instead. A celestial event predicted to the second forced the observing platform itself to move.

For Forty-Four Years, Bulgaria Set Its Time by Watching Stars Cross a Line

The Astronomical Observatory of Sofia University had already existed for decades when it acquired a national responsibility. Its main building and large dome were completed in 1897, and its 15.2-centimeter Grubb refractor became the first telescope on a permanent foundation in Bulgaria. In 1942 the observatory was designated by law as the country's Exact Time Service, a function it retained until 1986.

The method belonged to classical positional astronomy. According to Sofia University and Bulgarian National Television, exact time was determined by observing stars with a meridian circle. When a star of accurately known celestial position crosses the observer's local meridian, the event provides a precise astronomical reference for Earth's rotation. Repeated observations allowed the observatory to maintain the time reference on which the national service depended.

The present reference is produced very differently. The Bulgarian Institute of Metrology maintains the national standard for time and frequency, formally approved as a national standard by the Council of Ministers in 2003. Its technical documentation identifies a cesium frequency standard and a GPS receiver as the core equipment. The associated UTCBG scale had already begun participating in the international system used to form Coordinated Universal Time on 1 January 2001, with remote comparisons reported through the BIPM framework.

That sequence spans two fundamentally different definitions of precision. At the Sofia observatory, the passage of stars across a meridian helped reveal the rotation of Earth and therefore the hour. At the metrology institute, the second is reproduced from the frequency of a cesium standard and compared internationally through electronic links. Bulgaria's national timekeeping moved from observing the planet's rotation to maintaining an atomic oscillator, while the purpose remained the same: give the country a time reference that can be reproduced and compared beyond a single clock.

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