Engelbrecht's return

Sundial trial in the Eastern Bohemia

Sundial working at night

A sundial on a pyramid

The catalogue of sundials

The idea of making the catalogue of sundials came into being at Faculty of Natural Sciences (Charles University) in Praque. In the years 1981 - 1990 diploma papers which described the whole area of today's Czech Republic were elaborated. The total number of sundials filed at that time was 1,202. The results were not published. The team of authors continued this work and transferred the results into electronic form. Mentioned data were specified, completed and made topical. Some new places with sundial were found. The electronic catalogue was used as a basis for the book "Fixed Sundial Locations", which was published at the end of the last year.

The book contains 404 pages. You will find there the catalogue of 2,094 sundials on fixed locations in Bohemia, Moravia, Silezia and Slovakia. The catalogue itself is supplemented with statistics of sundials - according to regions, districts, and types, number of vertical sundials according to the orientation of the wall to cardinal points, to types of dial plates, poloses ...

In the book there are also the articles about the history of sundials, their principles, building and renovation, about different types, their odd locations and interests. The book is completed with the charts, surveys and maps, which makes looking for locations of sundials easier. The book contains 103 colour and 64 black and white photographs.

On the enclosed CD-ROM the electronic off-line version of the catalogue with 4,863 pictures of sundials is available and also the program SHC with the help of which it is possible to design a dial plate of a sundial.

The price of the book itself is about 10 euros (depending on the exchange rate).

The book can be ordered at the following address:

nakladatelstvi Academia, expedicni oddeleni
Rozvojova 135
Praha 6-Lysolaje
CZ-165 02  the Czech Republic
phone +420 220 390 510, +420 296 780 510
fax +420 220 390 510
or you can order it at the e-mail address: expedice@academia.cz

The electronic version is continuously being completed and made topical. Up to date 16. 3. 2007 it comprises 2,543 sundials from the Czech Republic and 182 from Slovakia. The state of sundials is filed by 10,157 pictures which were taken by 468 authors.

Engelbrecht's return

The building of the former town hall is situated in the square in town of Dvůr Králové nad Labem (longitude 15° 49', latitude 50° 26') in Eastern Bohemia. Its look before the renovation of the facade in 2002 is perceptible from the picture.

The aim of the renovation was to give back the facade its historic look. The idea appeared then to realize a sundial which used to be on the building at the turn of the century, about 1900.

Its author was Jan Engelbrecht, who lived in the years 1726 - 1807. In the Czech Republic there are still 6 sundials whose author was Jan Engelbrecht. At 3 other places his authorship is not sure. The existence of sundials made by Jan Engelbrecht in Dvůr Králové is not mentioned in any literature.

The only detail which could be used as a model is a digital enlargement.

For a project of sundial replica were used characterictic features which were used by Engelbrecht on his sundials: Numbers of each sundial are written in Roman figures on a gathered ribbon. The clock shows the time in 2 x 12 hour format. The dial's straight lines are provided with arrows. The author's name and the year 1797 are placed under the dial centre of the polos. Besides whole hours there are also sind for halves of an four and short lines? for quarters of an hour. On the dial plate there are also shown trpics and equinox with the symbol of zodiac.

I suggested to leave Engelbrecht's name on a new sundial. I recommended to mention two years - its origin (1797) and its "rebirth" (2002).

Sundial trial in the Eastern Bohemia

Sundial trial starts and finishes in Hradec Králové. It is possible to make it as a one - day tour by car.
Hradec Králové is the centre of the Eastern Bohemia. You might join the trip with a visit to our capital city - Prague, which is about 100 km far and easily reached by public transportation.

The plan of sundial trip
  1. In the historical centre of Hradec Králové on the "Small Square" (Male namesti) stand two cylinder altitude dials which make a part of column.
    If you want to read the time you need the help of an observer. He must firstly set style to the right date, then turn the column so that the shadow of style could be vertical.
    One dial has a plate for Local apparent time, the second one for Standard time (with two curves for morning and afternoon dials).

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    Longitude 15° 50¢ 11.9² Latitude 50° 12¢ 38²

    Location on the map

    In Hradec Králové there are more than 20 sundials. Some of them should require individual walk around the city.

  2. The 2nd place of sundials is in the small town of Dobruška. Two sundials are found on a belfry by the church of St Wenceslas in Kostelní street. One of them is on the wall with the azimuth -20°, the second one with the azimuth 70°.

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    Longitude 16° 9¢ 45.8² Latitude 50° 17¢ 34.7²

    Location on the map

  3. The third place of our trial is Nové Město nad Metují. The sundials are again in a couple on Huss Square (No 1225) on the building of a townhall. A visit to this town might include a visit to the castle on its gardens, too.

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    Longitude 16° 9¢ 9.9² Latitude 50° 20¢ 37.3²

    Location on the map

  4. The next stop is in the village of Studnice. You will see a sundial on a building with a rich history. Originally it used to be a part of fortification, later rectory, now it is the seat of municipal office. Once there used to be three sundials but after the reconstruction of this building there only is only one left.

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    Longitude 16° 5¢ 20.8² Latitude 50° 25¢ 18.6²

    Location on the map

  5. The sundial with the date of its origins - 1811 - is situated in Ratibořice. On the building , called Kavalierhaus, are 2 sundials which are both significantly damaged. A south-eastern sundial which can be seen from the castle park is still in function (still works). A clock-face of the south-western dial is dingy, the figures are missing and the older clock-face could be seen under it. There isn't style either.

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    Longitude 16° 3¢ 8.5² Latitude 50° 24¢ 58.3²

    Location on the map

  6. In the town of Dvur Králové nad Labem is a sundial on T. G. Masryk square on the building of a former townhall. In 2002 a replica of the former clock-face from 1797 was made with the use of historical photos. As for history of this sundial see see the information above.

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    Longitude 15° 48¢ 49.6² Latitude 50° 25¢ 55.6²

    Location on the map

    The town is also famous for its ZOO. Some of the animal live freely in "African safari". In the summer (from May till the end of September) the visitors can Watch safari from special "Safari buses".
    Further information about the ZOO is introduced on http://www.zoodvurkralove.cz/home_en.php.

  7. In Jaromer, at 12 Sladovna there is a beautiful painted wall dial. It is highly appreciated by sundial lovers from overseas http://www.advanceassociates.com/WallDial/PWS_Images.html#Czech Republic (24 Dials) If you want to see this sundial, it is better to watch it from the opposite (right) bank of the river Elbe (Labe).

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    Longitude 15° 55¢ 4.0² Latitude 50° 21¢ 17.0²

    Location on the map

  8. The last sundial of our trial is in the local part of Jaromer, called Josefov, at 1 Lidická Street. There is a pair of corner dials with the date of 1865. The dial attracts with unusual style.

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    Longitude 15° 55¢ 45.3² Latitude 50° 20¢ 18.9²

    Location on map

    A tourist attraction of Josefov, a fortification was built between 1780 - 1787. For information see http://www.pevnostjosefov.wz.cz/www_an/an_index.htm

Sundial working at night

The function of a vertical sundial is limited by the time when the sun shines on the wall. A dial face lies under the centre of a dial (the point where all the hour lines, and a polar-pointing style, meet) and its scale is 12 hours maximum.

The shadow doesn't fall above the centre of a dial.

general view

Sundial in Ústí nad Labem - Kočkov has a round face on a scale of 24 hours. It has two pointers. One of them is an oblique rod known from sundials. The second one is a laser pointer hidden under a round blue disc. Its movement is operated by the engine of a clockwise. It turns in an anticlockwise direction. One turn takes 24 hours. The ray of pointer functions as an hour hand.

sundial itself

If there is sufficient illumination, a sundial works according to a principle of hourly angle, the time is readout from the position of the dial's shadow.

When there is lighting reduction under the assigned figure, the light sensor switches on a laser pointer which turns by the help of a clockwise. Its movement is controlled by a radio reciever DCF 77 and it is corrected by PC. DCF77 is a longwave time signal and standard-frequency radio station. The 77.5 kHz carrier signal is generated from local atomic clock that is linked with the German master clock in Braunschweig.

et night

PC provides adjustment for longitude and adjustment for the equation of time. The direction of pointer's laser ray is equal to the local apparent time. Thanks to this fact the sundial shows the local apparent time at night as well.

et night

A sundial on a pyramid

The village of Malý Smokovec, which was interested in a sundial, is situated at the foothills of the High Tatras (the Slovak Republic).

As the shape of the object, on which a sundial is, should resemble the surrounding mountains, a regular three-side pyramid has been chosen.

The length of the foundation edges is seven metres. The inclination of the sides should be the same as the geographical latitude of the place.

One side of the face is turned to the south. This side was intended for a polar southern sundial.

Having removed a part of the pyramid contents from its west side, a vertical surface for western wall sundial was created.

On the ground in this part a chance of putting the face of the noon slot sundial appeared.

general view

Southern sundial

During the building of the pyramid the inclination of the side (49°) wasn't kept. That is why single time lines, which are realised by stainless steel stripes are not parallel to each other. They slightly diverge.

By the time lines Arabic numerals are located for the period of summer time validity and Roman numerals for the time when summer time doesn't run.

The time is defined by the shadow of one of the edges of the indicator.

The sundial shows the Local apparent time for central European latitude of 15°.

southern dial

Western sundial

On the vertical triangle side, which is turned to the west, a western sundial is located; it is the solution for summer time.

western dial

Noon slot sundial

The face of the sundial is made up by a line of local latitude, marked on the paving in the distance of 70 cm from the west vertical side. The indicator is a vertical slit passing through the pyramid (through the flat surface of the local latitude); the width of the slit is 8 mm.

The print of the light, passing through the slit at the moment of apparent local noon, falls on the line of the local meridian. The noon sundial on the object is the only sundial showing the local apparent time.

noon dial

The sundial in Malý Smokovec with geographical latitude 49° lies to the east from the central European meridian. Single time moments (sunrise, local apparent noon …) come earlier there than at the place of central European meridian. Due to this fact the south and west dials were designed with the correction for the central European meridian. For appointing the central European time there is a chart, which is located on the northern side of the pyramid.

According to this chart an observer either adds or subtracts the number of minutes, which correspond to the given date, to the datum taken from the sundial.

The object is completed with 12 elements for sitting. These are located in a part of a circle in front of the southern sundial.

In front of the northern sundial there is an object showing the main peaks.

On the top of the inclined plane there are 7 stainless steel stripes with the names of single peaks and their heights.

general view

mail addressmail / post address:

Ing. Miloš Nosek
     Mandysova 1408
     500 12 Hradec Králové
     Česká republika
     e-catalogue: http://www.astrohk.cz/slunecni_hodiny.html