Ona Lighthouse ( no, Ona fyr) is located on the small island of
Ona
Ona or ONA may refer to:
Anthropology
* Ona people, an indigenous people of southern Argentina and Chile
** Ona language, a language once spoken in Isla Grande de Tierra del Fuego
* Ona, a pre-Aksumite culture in Sembel, Eritrea
Geography
* On ...
in
Ã…lesund Municipality
Ålesund () sometimes spelled Aalesund in English, is a municipality in Møre og Romsdal County, Norway. It is part of the traditional district of Sunnmøre and the centre of the Ålesund Region. The town of Ålesund is the administrative cent ...
in
Møre og Romsdal
Møre og Romsdal (; en, Møre and Romsdal) is a county in the northernmost part of Western Norway. It borders the counties of Trøndelag, Innlandet, and Vestland. The county administration is located in the town of Molde, while Ålesund is the ...
county,
Norway
Norway, officially the Kingdom of Norway, is a Nordic country in Northern Europe, the mainland territory of which comprises the western and northernmost portion of the Scandinavian Peninsula. The remote Arctic island of Jan Mayen and t ...
. The lighthouse is built on ''Onakalven'', the highest
cliff
In geography and geology, a cliff is an area of rock which has a general angle defined by the vertical, or nearly vertical. Cliffs are formed by the processes of weathering and erosion, with the effect of gravity. Cliffs are common on co ...
on the island overlooking the
harbor
A harbor (American English), harbour (British English; see spelling differences), or haven is a sheltered body of water where ships, boats, and barges can be docked. The term ''harbor'' is often used interchangeably with ''port'', which is a ...
and the few, clustered wooden houses on this small island. The original rotating
Fresnel lens
A Fresnel lens ( ; ; or ) is a type of composite compact lens developed by the French physicist Augustin-Jean Fresnel (1788–1827) for use in lighthouses. It has been called "the invention that saved a million ships."
The design allows the c ...
remains in use.
History
The lighthouse was built in 1867 and was fully automated in 1971. The tall round cast iron lighthouse is red and the light sits at an elevation of above sea level. The continuous white light shines all night long and it also has a bright red flash every 30 seconds. The main light has an intensity of 79,000
candela
The candela ( or ; symbol: cd) is the unit of luminous intensity in the International System of Units (SI). It measures luminous power per unit solid angle emitted by a light source in a particular direction. Luminous intensity is analogous to ...
and the red flash has an intensity of 295,000 candela. The lighthouse is in operation from 16 July until 21 May each year; it does not operate during the rest of the year due to the
midnight sun
The midnight sun is a natural phenomenon that occurs in the summer months in places north of the Arctic Circle or south of the Antarctic Circle, when the Sun remains visible at the local midnight. When the midnight sun is seen in the Arctic, t ...
in May–July. The light can be seen for up to .
See also
*
List of lighthouses in Norway
The following is a sortable, but partial list of active and some decommissioned lighthouses along the Norwegian coastline.
The sequence number follows the convention of listing lighthouses from the coastal border in the south with Sweden around ...
*
Lighthouses in Norway
The coast of Norway is 100,915 km long and there have been a total of 212 lighthouses along it, but no more than 154 have ever been operational at the same time. The first, Lindesnes Lighthouse, opened in 1655; the newest Lighthouse, Anda, ...
References
External links
Norsk Fyrhistorisk Forening
Lighthouses completed in 1867
Lighthouses in Møre og Romsdal
Ã…lesund
{{MøreRomsdal-geo-stub