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

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

12:00
18 November 2023

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

Privacy Policy

The days may be getting shorter, but 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
Forest fires are getting out of control. Spain and France. . . Saturday 25 July 2026
A split-screen image featuring a photograph and a weather map. On the left, thick, dark-grey smoke rises from several fire sites in a wooded coastal area; a calm stretch of water can be seen in the foreground. On the right, a weather map shows south-western France and northern Spain. A red arrow points from the Atlantic towards the French Atlantic coast, symbolising an onshore wind. Sunny weather is forecast for Bordeaux at around 20 degrees, and Bilbao is also expected to be sunny at around 27 degrees. A large warning sign with a flame symbol indicates an increased risk of forest fires.
Saturday 25 July 2026

Spain and France

Forest fires are getting out of control
New heatwave in southern Europe. Up to 45 degrees in Spain. . . Tuesday 21 July 2026
Split temperature map showing extreme heat across Spain on the left and Greece on the right, with temperatures reaching 44°C near Murcia, around 40°C in parts of Greece, and a large thermometer icon highlighting dangerous heat.
Tuesday 21 July 2026

Up to 45 degrees in Spain

New heatwave in southern Europe
Severe damage along the Adriatic coast. Huge hail and storms. . . Wednesday 22 July 2026
Two hands are holding huge hailstones; next to them is a weather map showing thunderstorms and frequent lightning over the Adriatic coast and the western Balkans.
Wednesday 22 July 2026

Huge hail and storms

Severe damage along the Adriatic coast
All weather news
This might also interest you
Historic Storm Éowyn arrives. On this day.... . . Saturday 24 January 2026
Split image showing a person in a yellow jacket struggling against strong winds and heavy rain on a street at night on the left, and an Irish wind forecast map on the right with red and purple shading, gusts up to 75 mph, and a wind warning icon, divided by a curved white line.
Saturday 24 January 2026

On this day...

Historic Storm Éowyn arrives
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
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

facebooktwitteryouTubelinkList