Light pollution in Romania, 1992–2024
How Many Stars Can You Still See?
From a site with no artificial light, the naked eye can pick out nearly 4,500 stars on any clear night. From central Bucharest, under the same constellations, fewer than 130 remain. This page measures the distance between those two numbers for 44 locations across Romania and tracks how fast artificial light has grown since 1992.
Find your sky
Choose a location. The sky on screen will empty to match the number of stars visible to the naked eye on a clear, moonless night. The brightest stars — Sirius, Vega, Arcturus — are the last to go. The ones that vanish first, at magnitude 5 or 6, were visible from an ordinary village just two or three generations ago.
The figures correspond to best-case conditions: clear night, new moon, dark-adapted eyes, looking straight up. The real sky varies with moon phase, atmospheric conditions, and the degree of dark adaptation.
Your sky and the sky that could be
Left: the sky above your chosen location, showing only the stars you can see. Right: the same frame with no light pollution. The difference between the two panels is what artificial light has covered.
How fast does night disappear?
Since 1992, when the first satellite with a dedicated nighttime sensor began measuring Earth's radiance, artificial luminance has roughly doubled across Romanian cities. Rural electrification, suburban sprawl, LED street lighting, and illuminated signs have changed the sky more in thirty years than in the three thousand before them.
The chart below tracks five locations: a capital, three major cities, and a mountain peak. The cities drop almost without interruption in lost stars. Omu Peak, at 2,505 metres, far from any settlement, has barely lost a hundred stars over the same period.
European capitals, in stars
Bucharest ranks 20th of 28 European capitals by the number of stars visible from the city centre — more polluted than Warsaw or Budapest, but below Paris, Rome, or Athens. Romania's paradox: one of the most light-polluted capitals in the European Union and, at the same time, home to some of the last patches of natural night sky on the continent. The Carpathian Mountains, far from any metropolis, still harbour Bortle 2 zones — a nearly pristine sky found in few other places in continental Europe.
Method and sources
How to read
A "naked-eye" star count means: how many stars from the Yale Bright Star Catalogue (BSC5, 9,096 entries with visual magnitude ≤ 6.5) would be visible above the horizon on a clear, moonless night with fully dark-adapted eyes, if the only variable were artificial sky luminance. The maximum is 4,457 (the hemispheric fraction corrected for atmospheric extinction, factor 0.49).
Conversion chain
Satellite nighttime radiance (nW/cm²/sr) → artificial sky luminance (mcd/m²) → sky quality SQM (mag/arcsec²) → naked-eye limiting magnitude (NELM) → visible stars from BSC5. Each step uses published transfer functions: the Falchi 2016 atlas for the first two, the Cinzano/Bortle correspondence table for the third, and the star count is read directly from the catalogue.
Primary sources
Falchi, F. et al. "The new world atlas of artificial night sky brightness." Science Advances 2(6): e1600377, 2016. Earth Observation Group (NOAA), VIIRS Day/Night Band annual composites, 2012–2024. NOAA, DMSP-OLS Nighttime Lights archive, 1992–2013. Hoffleit, D. & Jaschek, C. The Bright Star Catalogue, 5th rev. ed., Yale University Observatory, 1991.
Limitations
Radiance figures are annual averages on 15-arc-second pixels (roughly 500 × 500 metres at the equator). The real sky varies with moon phase, atmospheric conditions, dark adaptation, and viewing direction. The values shown correspond to best-case conditions: clear night, new moon, looking at the zenith. The DMSP and VIIRS series use different sensors; the 2012–2013 transition introduces a discontinuity corrected by overlapping the two common years.