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How many stars can we still see? - The starlight wiki

Distribution of the total radiation - the light at night - in 2012 at the Setagaya - Tokyo Lightmeter station Details of the Setagaya station at the GAVO Lightmeter data-centre. The distribution of the decadic logarithm of total radiation in Watt per squaere meter W/m² is are shown as measured from June to December 2012 (courtesy Nobuaki Ochi and the Setagaya station.
Lighmeter (at the top of the mast) in the Dürrenstein Wilderness area, Eastern Alps, Austria, in March 2012 after taking a unique data set during the strong and snow rich winter to help the IAU's initiative on astronomy and world heritage.
Lighmeter (at the top of the mast) in the Dürrenstein Wilderness area, Eastern Alps, Austria, in March 2012 after taking a unique data set during the strong and snow rich winter to help the IAU's initiative on astronomy and world heritage.
Lightmeter on the 30m tower at the ESO-ELT 42m telescope site , Jan 2011
Lightmeter on the 30m tower at the ESO-ELT 42m telescope site , Jan 2011
Lightmeter at Cerro Armazones, just before installation, Jan 2011
Lightmeter at Cerro Armazones, just before installation, Jan 2011
First light for the Lightmeter at the Teide Observatory. Image: Hans Deeg
First light for the Lightmeter at the Teide Observatory. Image: Hans Deeg
Jan 2010: Day- and nightime 100s-variations at Paranal demonstrate the Sun-recording capabilities of the Lightmeter under the unique Atacama skies.
Jan 2010: Day- and nightime 100s-variations at Paranal demonstrate the Sun-recording capabilities of the Lightmeter under the unique Atacama skies.
June 2009 night brightness, measured in Berlin, Linz, Tautenburg and Vienna.
June 2009 night brightness, measured in Berlin, Linz, Tautenburg and Vienna.
Simultaneous measurements of night brightness near the 2009 summer-solstice.
Simultaneous measurements of night brightness near the 2009 summer-solstice.
First Berlin-measurements Feb to early March 2009. Horizontal line: value for full moon in zenith
First Berlin-measurements Feb to early March 2009. Horizontal line: value for full moon in zenith
40 days of measurements at Tautenburg; non-stop from 26th Sept. to 7th Nov. 2008.
40 days of measurements at Tautenburg; non-stop from 26th Sept. to 7th Nov. 2008.


Lightmeter: A network of newly-developed, low-cost lightmeters starts the global continuous monitoring of artificial night sky brightening (light pollution). Jan. 2013: >300 Lightmeters. more

Jan. 12th 2013: First results from the new SETAGAYA (Tokyo) station as presented at a star party on 11 Jan. at the Setagaya Planetarium. From June to December 2012 the light at night 8 km from the centre of Tokyo scatters around the maximum full-moon values but some hours during the year are 15 times darker than the full moon - still about 10 times above natural light at night. --GuentherWuchterl 17:03, 14. Jan. 2013 (UTC)

Sep. 20th 2012:, 8 UTC first light for the southernmost Lightmeter (47° S) at Mt. John Observatory, Lake Tekapo in the Lake Tekapo - Aoraki - Mount Cook Starlight Reserve, New Zealand, http://starlightreserve.org (IDA gold http://www.darksky.org/page/IDSReserves ).


Apr. 27th 2012:, Light over Vienna - a study of the energy content of Vienna's light-dome and the top light emitters (in german): Download pdf from WUA at the Vienna enviromental protection agency WUA, http://wua-wien.at/


How many stars can we still see?: Simple naked eye sightings of the Little Dipper or Orion serve to determine the quality of the world's night skies. more


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PV light measurement at twilight and night, Brno Observatory

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