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
More comfortable night's sleep. Overnight low drops. . . Wednesday 5 August 2026
Morning temperature map of the UK and Ireland showing cool conditions, with temperatures ranging from 7°C in South Wales to 13°C in southeast England. Ireland records 9–12°C, while much of England and Wales is between 8°C and 10°C. A blue thermometer icon highlights the cooler weather.
Wednesday 5 August 2026

Overnight low drops

More comfortable night's sleep
Stormy day in parts of the UK & Ireland. Lightning potential. . . Tuesday 4 August 2026
Satellite and lightning map of Scotland showing widespread rain and thunderstorms across the Highlands and western Scotland, with lightning strikes around the west coast and Hebrides. A thunderstorm icon highlights the active weather, while temperatures range from 15°C in Aberdeen to 24°C in Newcastle.
Tuesday 4 August 2026

Lightning potential

Stormy day in parts of the UK & Ireland
Forest fires spread to south-east Europe. Heat and strong winds. . . Thursday 30 July 2026
Split image showing an active wildfire with flames and thick smoke on the left, and a wind forecast map of Greece on the right with gusts of 25–35 mph around the Aegean Sea, alongside a wildfire warning symbol highlighting elevated fire danger.
Thursday 30 July 2026

Heat and strong winds

Forest fires spread to south-east Europe
All weather news
This might also interest you
Long-term trends need a pinch of salt. 40 °C in July?. . . Tuesday 30 June 2026
Temperature radar of 2022 heatwave where the all-time temperature record in the UK was set. Warning symbol overlain.
Tuesday 30 June 2026

40 °C in July?

Long-term trends need a pinch of salt
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
New records for England and Wales. Broken again tomorrow?. . . Thursday 25 June 2026
Temperature map of southwest Britain on 25.06 showing extreme heat across southern Wales and southwest England, with Bute Park in Cardiff highlighted at 34.2°C and Yeovilton at 36.4°C amid widespread deep red heat zones.
Thursday 25 June 2026

Broken again tomorrow?

New records for England and Wales
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