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

12:00
18 November 2023

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

Settings for external content

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
Tropical storm hits Mexico. Ahead of the World Cup. . . Monday, 8 June 2026
A small weather map showing satellite imagery and precipitation over Europe. A red warning triangle with an exclamation mark is displayed in the bottom left-hand corner. The map shows numerous blue, yellow and orange weather symbols indicating active precipitation or areas of thunderstorms. The graphic conveys a general weather or severe weather warning.
Monday, 8 June 2026

Ahead of the World Cup

Tropical storm hits Mexico
Japan continues to face torrential rain. After Typhoon Jangmi. . . Friday, 5 June 2026
Split image showing a weather radar map with a tropical cyclone and heavy rain bands moving across Japan on the left, and an aerial view of widespread flooding around a coastal town and river estuary on the right.
Friday, 5 June 2026

After Typhoon Jangmi

Japan continues to face torrential rain
The second warmest May on record. Early heatwave in Europe. . . Wednesday, 10 June 2026
Split image showing a European temperature anomaly map with widespread warmer-than-average conditions on the left and a poerson cooling off beside a fountain near the Eiffel Tower during hot weather on the right.
Wednesday, 10 June 2026

Early heatwave in Europe

The second warmest May on record
All weather news
This might also interest you
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
Turbulent weather in the Canary Islands. Storm and rain. . . Friday, 12 December 2025
Weather graphic showing rain and wind fields over the Canary Islands and a central warning symbol.
Friday, 12 December 2025

Storm and rain

Turbulent weather in the Canary Islands
Seasonal warmth between spring thunder. Your weather - Your shots. . . Sunday, 19 April 2026
Split image showing coastal sunset with layered lenticular clouds over rooftops and palm trees on the left, and a green valley with river and hills under soft daylight on the right.
Sunday, 19 April 2026

Your weather - Your shots

Seasonal warmth between spring thunder
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