Home
Weather New York
WeatherRadar
RainRadar
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

06:30 PM
November 18, 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 percent 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 USA editorial team
More on the topic
Heat is affecting agriculture globally. WMO report. . . Sunday, April 26, 2026
A young woman is kneeling in a cornfield, tending to her plants
Sunday, April 26, 2026

WMO report

Heat is affecting agriculture globally
Heat wave setting records across Europe. London breaks May record. . . Tuesday, May 26, 2026
European heat wave
Tuesday, May 26, 2026

London breaks May record

Heat wave setting records across Europe
The only Blue Moon of the year rises. May astronomy outlook. . . Saturday, May 2, 2026
Saturday, May 2, 2026

May astronomy outlook

The only Blue Moon of the year rises
All weather news
This might also interest you
Be prepared for wildfires. By using the app. . . Sunday, June 28, 2026
Wildfires can spark anywhere, anytime. The Weather & Radar app can help you determine your area's risk.
Sunday, June 28, 2026

By using the app

Be prepared for wildfires
Be ready for tropical activity. Tips & tools. . . Saturday, June 27, 2026
Track hurricanes with the WeatherRadar
Saturday, June 27, 2026

Tips & tools

Be ready for tropical activity
Watch the heatwave build. Record-breaking heat. . . Monday, June 29, 2026
Monday, June 29, 2026

Record-breaking heat

Watch the heatwave build
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

instagramfacebookthreadslinkList