Home
Weather London
WeatherRadar
RainfallRadar
TemperatureRadar
WindRadar
LightningRadar
Weather News
Editor's Pick
Discover the app
Weather widget
Contact us
Apps
Career
    Home / Editor's Pick /

    In the base of a valley: A town that uses mirrors for sunlight

10:07
7 November 2022

In the base of a valley
A town that uses mirrors for sunlight

Rjukan
Rjukan, known for its perpetual darkness in winter, is located in the bottom of a valley between steep mountains. It only gets sunlight reflected by giant mirrors on the mountain - © picture alliance

While the days across the UK and Ireland are getting noticeably shorter, at least we get natural sunlight unlike a town in Norway that relies on mirrors to bring the sunshine.

Located at the bottom of a steep valley surrounded by mountains, the tiny town of Rjukan does not see sunlight for seven months of the year.

Rjukan was built between 1905 and 1906 by Sam Eyde. It was Eyde who dreamt of a giant mirror in 1913 to provide sunlight for the towns factory workers.

Instead, a tramway, that is still in operation today, was built to give employees and their families access to the sunshine. In 2005, Eyde’s mirror project was revived by Martin Anderson.

Eight years later, three 182-square-foot mirrors controlled by computer-driven motors were installed to bring a 6,500 square foot area of winter sunshine to the town.

The mirrors are able to bring 80-100% of the sun’s light to Rjukan, by tracking the movement of the sun and repositioning themselves every 10 seconds to keep the light consistent.

Although the mirrors are unique, Rjukan’s were not the first. In December 2006, the town of Viganella in Italy’s Antrona Valley celebrated a day of light after a steel sheet was installed to reflect sunlight between November and February.

Weather & Radar editorial team
More on the topic
Record-breaking heatwave in Europe. New records. . . Thursday, 25 June 2026
A map showing extremely high temperatures across Western Europe and a warning symbol. On the right, people cool off at a fountain in front of the Eiffel Tower during the heatwave in Paris.
Thursday, 25 June 2026

New records

Record-breaking heatwave in Europe
Frost instead of a heatwave. Winter in South America. . . Friday, 26 June 2026
Temperature map of South America showing a widespread cold air outbreak across Argentina, Uruguay, Paraguay, and southern Brazil, with a large blue thermometer icon highlighting below-average temperatures and near-freezing conditions in parts of Argentina.
Friday, 26 June 2026

Winter in South America

Frost instead of a heatwave
Super typhoon near the Philippines. Gusts of up to 155 mph. . . Tuesday, 23 June 2026
WindRadar showing Typhoon MEKKHALA east of Taiwan. A clearly visible eye, surrounded by areas of extremely high wind speeds.
Tuesday, 23 June 2026

Gusts of up to 155 mph

Super typhoon near the Philippines
All weather news
This might also interest you
Flooding, gales, and heavy snow. Storm Chandra. . . Tuesday, 27 January 2026
Split image showing aerial flooding in a town with muddy water covering roads on the left, and a rural road on the right blocked by heavy snowfall with vans stopped and a person walking in snow.
Tuesday, 27 January 2026

Storm Chandra

Flooding, gales, and heavy snow
Storm Chandra makes impact. Severe gales & heavy rain. . . Tuesday, 27 January 2026
Split image showing strong winds over the UK on a forecast map and widespread rain and snow on a weather radar map.
Tuesday, 27 January 2026

Severe gales & heavy rain

Storm Chandra makes impact
Bright and warm conditions take hold. Spring-like outlook. . . Thursday, 23 April 2026
Split UK map showing warm temperatures up to 21 degrees in orange on the left and clear sunny conditions with temperatures from 12 to 18 degrees on the right, with sun icons across the country.
Thursday, 23 April 2026

Spring-like outlook

Bright and warm conditions take hold
All articles
Weather & Radar

Weather & Radar is also available on

Google Play StoreApp Store

Company

Contact us Privacy Policy Legal info Accessibility statement

Services

Uploader

Socials

facebooktwittertikToklinkList