Pomona Stargazing & Astronomy Report
Light pollution and stargazing locations near Pomona
- City
- Pomona
- Country
- United States
- Latitude
- 34.0553
- Longitude
- -117.7500
Key Sky Quality Metrics
- SQM (mag/arcsec²)
- 17.85
- Bortle class
- Class 9 (Class 9)
- Darkness Quotient
- 22%
- Dataset
- March 2026
Inner city sky
Stargazing in Pomona
Pomona is a sizeable Inland Empire city in southern California, part of the wider Los Angeles urban region and shaped by dense suburban development.
The city generally experiences High Light Pollution, with a Darkness Quotient of 22% — placing it among the more light-polluted urban locations in the United States.
For practical observing from within Pomona, the most realistic targets are the Moon, planets, double stars and the brightest open clusters. A few showpiece deep-sky objects can be attempted with care, but faint galaxies, nebulae and the Milky Way are largely overwhelmed by the city glow.
Meaningfully darker skies are not close at hand from Pomona. The nearest really worthwhile improvement is roughly 300 kilometres away to the east-north-east, near Searchlight Township, Nevada, while the nearest good-quality Bortle 4 option is about 300 kilometres to the west-north-west near Tulare County, California.
The map shows Pomona embedded within a broad, intense urban light dome, with the brightest white-pink core spreading across much of the surrounding metropolitan area. Rather than standing out as an isolated bright patch, the city merges into a much larger belt of heavy illumination, which is exactly what makes local stargazing so challenging.
Around that core, the colours step outward through red, orange, yellow and green before finally easing into blue and grey much farther from the city. The darkest-looking regions on the map sit mainly well away from the urban basin, especially towards the north-east and east, with some darker pockets also appearing farther north-west.
Compared with its immediate surroundings, Pomona is not dramatically brighter than nearby built-up areas because the whole region is strongly lit. The key pattern is not a quick escape to darkness, but a long, gradual fade in skyglow before genuinely dark country begins.
How the sky looks overhead
Looking straight up from Pomona, the sky is strongly washed out by urban light, with a zenith reading of 17.85 SQM corresponding to Bortle 9 conditions. Even near the highest part of the sky, the background will usually appear bright rather than properly dark, especially once local lighting and haze are added to the scene.
Under skies like this, the main constellations are still visible, but they appear thinned out and stripped of their fainter members. Familiar patterns such as Orion, Scorpius or the Summer Triangle can still be picked out, yet the Milky Way itself is effectively lost from view.
For casual skywatching this still leaves plenty to enjoy in the brighter showpieces, but it is not a setting that rewards faint deep-sky observing. The overhead sky is better thought of as a bright urban ceiling than a dark window into space.
north - marginal
About 15 kilometres north of Pomona, conditions are marginal, with a Bortle 6 sky that is noticeably better than the city centre but still far from dark. If you keep going, genuinely dark skies become available at around 200 kilometres in this direction.
north-north-east - poor
About 15 kilometres north-north-east of the city, the sky is still poor, sitting at Bortle 7. The direction does improve with distance, and genuinely dark conditions are reached at around 200 kilometres.
north-east - poor
Around 15 kilometres to the north-east, the sky remains poor at Bortle 8, so local glow still dominates. Better conditions arrive farther out, with genuinely dark skies appearing at roughly 200 kilometres.
east-north-east - poor
At roughly 15 kilometres east-north-east, the sky is still poor at Bortle 9, with very little practical improvement over the city itself. This is one of the more promising long-range directions though, with genuinely dark skies reached at around 100 kilometres.
east - poor
About 15 kilometres east of Pomona, the sky is poor at Bortle 9 and remains heavily washed out. A much more serious improvement does come eventually, but you need to travel roughly 200 kilometres for genuinely dark conditions.
east-south-east - poor
At about 15 kilometres east-south-east, the sky is still poor at Bortle 9. This direction improves only slowly at first, with genuinely dark skies not arriving until around 200 kilometres out.
south-east - poor
Around 15 kilometres to the south-east, the sky is poor at Bortle 9, so urban skyglow remains overwhelming. Substantially darker conditions do exist farther on, but they are only reached at about 200 kilometres.
south-south-east - poor
About 15 kilometres south-south-east of the city, the sky is poor at Bortle 8, with only limited relief from the urban glow. Genuinely dark skies are not reached within the sampled distance in this direction.
south - poor
At roughly 15 kilometres south, conditions are still poor at Bortle 7. This line of travel eventually improves a great deal, with genuinely dark skies reached at around 200 kilometres.
south-south-west - poor
Around 15 kilometres south-south-west, the sky remains poor at Bortle 8. It does become far better much farther out, with genuinely dark skies reached at about 200 kilometres.
south-west - poor
About 15 kilometres to the south-west, the sky is poor at Bortle 8 and still dominated by metropolitan light. Darker country does exist in this direction, but only after a journey of roughly 200 kilometres.
west-south-west - poor
At around 15 kilometres west-south-west, the sky is poor at Bortle 9, so there is little immediate gain for observers. Conditions improve eventually, with genuinely dark skies reached at about 200 kilometres.
west - poor
About 15 kilometres west of Pomona, the sky is poor at Bortle 8. This direction stays bright for a long stretch, and genuinely dark skies are only reached at roughly 200 kilometres.
west-north-west - poor
At roughly 15 kilometres west-north-west, the sky is poor at Bortle 9. There is improvement farther out, with genuinely dark skies reached at around 200 kilometres, although the nearer route remains heavily light-polluted.
north-west - poor
Around 15 kilometres north-west, the sky is poor at Bortle 8, though it does improve steadily with distance. Genuinely dark skies are not reached within the sampled distance in this direction.
north-north-west - poor
About 15 kilometres north-north-west of the city, the sky is poor at Bortle 7. There is a meaningful improvement farther on, with genuinely dark skies reached at around 200 kilometres.
zenith - poor
Straight overhead in Pomona, the sky is poor, with a zenith brightness corresponding to Bortle 9. The brighter constellations and planets remain visible, but the background sky stays luminous and the Milky Way is effectively invisible from the city.
Looking upward still rewards casual observing of the Moon and bright stars, yet faint patterns are badly diluted by the light dome. Even at the zenith, Pomona behaves like a strongly illuminated urban sky rather than a dark observing site.
-
Near Inyo County, California
- Direction
- ENE
- Distance (km)
- 312.5
- SQM
- 21.68
- Bortle
- 3
Milky Way visible, broadband DSO imaging
-
Near Searchlight Township, Nevada
- Direction
- ENE
- Distance (km)
- 295.6
- SQM
- 21.43
- Bortle
- 3
Milky Way visible, broadband DSO imaging
-
Near Tulare County, California
- Direction
- WNW
- Distance (km)
- 298.9
- SQM
- 21.10
- Bortle
- 4
Bright nebulae, galaxies, narrowband imaging
Genuinely dark skies require a significant journey from Pomona rather than a quick evening drive. The nearest strong step up is around 295 kilometres to the east-north-east near Searchlight Township, Nevada, where conditions reach Bortle 3, while the nearest good Bortle 4 site is about 300 kilometres to the west-north-west near Tulare County, California.
In most directions, the sky stays heavily affected by urban light for a long way out, so short trips tend to bring only modest improvement rather than truly dark observing.
-
Within 500 km
- Place
- Near Inyo County, California
- Direction
- ENE
- Distance (km)
- 312.5
- SQM
- 21.68
- Bortle
- 3
Long-term light pollution trend
Pomona's long-term trend points in the wrong direction for stargazers, with average night sky brightness gradually worsening over time. The SQM has shifted from 18.25 in the earliest reading to 17.85 in the latest one, a net decline of 0.40 mag/arcsec² across the record.
The fitted trend slope of -0.0279 SQM per year suggests a slow but persistent brightening of the sky rather than a sudden change. Across 76 datasets, the city has ranged between 17.81 and 18.34 SQM, so while conditions do vary a little, the broader picture remains one of consistently heavy light pollution.
In practical terms, that means Pomona has stayed firmly in bright urban-sky territory throughout the period measured. Any gains from transparency or unusually clear nights are likely to be temporary, not a sign of a darker long-term baseline.
From within Pomona, the best targets are the ones that can punch through a bright urban background: the Moon, planets, double stars and the brightest star clusters. These are the objects most likely to give satisfying views without needing to leave the city.
A small number of showcase deep-sky targets are still possible with patience, especially bright objects such as M42 or the very brightest globular clusters. Even then, contrast is the main problem, so they tend to look washed out rather than richly detailed.
For the Milky Way, faint galaxies, broad nebulae and meteor watching, a much darker site is strongly preferable. Those are exactly the kinds of targets most affected by Pomona's heavy skyglow.
- Moon
- planets
- double stars
- brightest open clusters
- bright nebulae such as M42
- the brightest globular clusters
- Milky Way
- faint galaxies
- broadband nebulae
- meteor showers
Can you see stars from Pomona?
Yes — you can still see stars from Pomona, especially the brighter ones that form the main constellation patterns. What you lose are the fainter background stars, so the sky looks much sparser than it would from a dark rural site.
Can you see the Milky Way from Pomona?
In normal conditions, no — the Milky Way is effectively lost in Pomona's urban skyglow. You would need to travel well away from the city for a realistic chance of seeing it properly.
What Bortle class is Pomona?
Pomona is Bortle Class 9, which is an inner-city style sky. In practice that means a very bright background sky and strong limits on faint deep-sky observing.
What is the SQM in Pomona?
Pomona's measured sky brightness is 17.85 SQM. That is firmly in bright urban territory, where the sky background itself noticeably reduces contrast.
Where are the nearest dark skies to Pomona?
The nearest listed genuinely dark site is Near Searchlight Township, Nevada, about 295.6 kilometres to the east-north-east, where conditions reach Bortle 3. Another excellent option is Near Inyo County, California, about 312.5 kilometres away in a similar direction, while the nearest good Bortle 4 site is Near Tulare County, California, around 298.9 kilometres to the west-north-west.
Is Pomona good for astrophotography?
It can work for lunar, planetary and some narrow-field imaging of bright targets, but Pomona is not well suited to wide-field deep-sky astrophotography from within the city. The strong skyglow makes it much harder to capture faint nebulae, galaxies and Milky Way scenes cleanly.
How far do you need to drive from Pomona for darker skies?
For a truly major improvement, you are generally looking at a journey of roughly 300 kilometres rather than a short hop out of town. The nearest listed dark-sky options are near Searchlight Township, Nevada, and Tulare County, California, both close to that sort of distance.