--- title: Sundial url: "https://www.donauregion.at/en/oesterreich-poi/detail/401244/sundial.html" description: "Sundial on the Danube promenadeSince the summer of 1993, a unique timepiece, designed and built by physics and astronomy student Werner Riegler from Grein, has adorned the banks of the Danube in the Esperantoplatz area. This sundial is a so-called equatorial sundial, in which the shadow of a wire rope stretched parallel to the earth's axis falls on a scale. It is then possible to read the time from a semi-cylindrical dial with an accuracy of around two minutes. The frame of this clock is made of chrome-nickel steel, while the dial and scales are made of brass. In addition to the time display, a granite globe is attached to the front. This globe with the engraved continents is illuminated by the sun in the same way as the earth itself. You can therefore see from the shadow boundaries in which countries the sun is currently shining. The fascinating thing about a clock like this is that it is easy to understand how it works and therefore easy to learn about the connections between the movement of the earth and the sun." date: 2015-07-24 modified: 2026-03-05 --- # Sundial Sundial ========= Grein, Oberösterreich, Österreich ![](https://assets.tourdata.at/260x195/204973/2BCB3D3F8A603149D779BF4111320CC255667FD894470C365F0EA62AA794E66F/sonnenuhr-grein.jpg) © Open copyright © WGD Donau Oberösterreich Tourismus GmbH / Andreas Kranzmayr Close copyright [ ![Sundial in Grein: In the centre of the picture is a modern, wave-shaped sculpture made of metal, which extends over an elongated base. In front of the sculpture is a square with a circular pattern of paving stones. To the right is a large stone on another plinth. The background shows buildings with traditional architecture and towers, surrounded by green spaces.](https://assets.tourdata.at/x550/204973/2BCB3D3F8A603149D779BF4111320CC255667FD894470C365F0EA62AA794E66F/sonnenuhr-grein.jpg "© WGD Donau Oberösterreich Tourismus GmbH / Andreas Kranzmayr") ](https://assets.tourdata.at/1920x/204973/2BCB3D3F8A603149D779BF4111320CC255667FD894470C365F0EA62AA794E66F/sonnenuhr-grein.jpg) Esperantoplatz 4360 Grein [ open in Google Maps ](https://www.google.com/maps/search/?api=1&query=Esperantoplatz%2C%204360%20Grein "Link will open in a new window") [ Open in Apple Maps ](https://maps.apple.com/place?address=Esperantoplatz%2C%204360%20Grein "Link will open in a new window") ![](https://static.ecmaps.de/staticmap.jpg?experience=webarchitektur-meta&lat=48.225230165007986&lon=14.853816032409666&width=991&height=450&project=ttg-osm-summer-original&zoom=2000&server=meta.tourdata.at) Sundial on the Danube promenade Since the summer of 1993, a unique timepiece, designed and built by physics and astronomy student Werner Riegler from Grein, has adorned the banks of the Danube in the Esperantoplatz area. This sundial is a so-called equatorial sundial, in which the shadow of a wire rope stretched parallel to the earth's axis falls on a scale. It is then possible to read the time from a semi-cylindrical dial with an accuracy of around two minutes. The frame of this clock is made of chrome-nickel steel, while the dial and scales are made of brass. In addition to the time display, a granite globe is attached to the front. This globe with the engraved continents is illuminated by the sun in the same way as the earth itself. You can therefore see from the shadow boundaries in which countries the sun is currently shining. The fascinating thing about a clock like this is that it is easy to understand how it works and therefore easy to learn about the connections between the movement of the earth and the sun. [ Contact ](#ttgCollapseKontakt) ---------------------------------- **Sundial** Esperantoplatz 4360 Grein Phone +43 7268 7055Show no. E-Mail [info.grein@oberoesterreich.at](#mailto) --- **Contact person** Äquatorialsonnenuhr --- **We speak the following languages** German [ Opening hours ](#ttgCollapseOeffnungszeiten) ------------------------------------------------ - always open (24/7) - open to the public [ Arrival ](#ttgCollapseAnreise) ---------------------------------- [ Suitability ](#ttgCollapseEignung) -------------------------------------- - Suitable for groups [ Accessibility ](#ttgCollapseBarrierefreiheit) ------------------------------------------------- Suitable for wheelchairs: Not all of the legally stipulated ÖNORM are complied with. In principle, this object is suitable for wheelchairs and no assistance is necessary. powered by [TOURDATA](https://www.tourdata.at "New window") [Suggest a change](#mailto) [ ![TOURDATA Logo](https://www.donauregion.at/fileadmin/templates/global/images/Logo-Tourdata.png "TOURDATA Logo") ](https://www.tourdata.at "New window")