Clarksville Stargazing & Astronomy Report

Light pollution and stargazing locations near Clarksville

City
Clarksville
Country
United States
Latitude
36.5298
Longitude
-87.3595

Key Sky Quality Metrics

SQM (mag/arcsec²)
18.48
Bortle class
Class 8 (Class 8)
Darkness Quotient
27%
Dataset
March 2026

City sky

Stargazing in Clarksville

Clarksville is a mid-sized city in northern Tennessee, near the Kentucky border, with a strong military and regional-hub character.

The city generally experiences High Light Pollution, with a Darkness Quotient of 27% — making it brighter than many smaller towns and rural communities, though not as overwhelming as the biggest metropolitan cores.

For practical observing from within the city, the most reliable targets are the Moon, planets, double stars and the brightest open clusters. A few showpiece objects such as Orion Nebula and the brightest globular clusters can still be attempted, but faint galaxies and delicate nebulae are mostly lost in the glow.

Meaningfully darker skies do exist, but they are not right on the doorstep. The nearest reasonable step up is about 80 kilometres to the west, near Henry County, Tennessee, where conditions improve to genuinely useful rural darkness.

The map shows Clarksville as a bright pink-white urban core surrounded by a broad halo of red, orange and yellow, which is exactly the pattern you would expect from a sizeable built-up area spilling light well beyond the city centre.

Away from that core, the wider landscape is mottled rather than uniformly dark: there are many smaller bright islands in most directions, suggesting scattered towns and developed corridors that keep the horizon busy with local light domes. Even so, the background does settle into more promising blue areas outside the immediate urban halo, especially towards the west and parts of the south-west, where the city’s glow appears to thin out more cleanly.

By contrast, some directions remain more cluttered with secondary bright patches, so Clarksville stands out as one of several luminous centres rather than an isolated source in a very dark region. In plain terms, the city is clearly much brighter than its surroundings, but the surrounding countryside is mixed enough that the best gains come from choosing direction carefully rather than simply driving a little way out.

What the sky overhead is like

Looking straight up from Clarksville, the zenith sits in Bortle 8 territory, which means the sky overhead is distinctly bright rather than properly dark. The familiar brighter constellations remain easy enough to trace, but the background sky lacks the rich, inky contrast that makes fainter stars stand out.

In practice, this means the overhead sky can still support casual observing of bright targets, while subtler deep-sky detail is heavily suppressed. The brightest patterns are there, but the city glow leaves the whole scene looking washed out compared with a rural site.

north - marginal

About 15 kilometres north of Clarksville, the sky is marginal, around Bortle 6, so there is some improvement but still plenty of intrusive skyglow. It gets meaningfully better farther out, reaching Bortle 4 at around 50 kilometres, but genuinely dark skies are not reached within the sampled distance in this direction.

north-north-east - marginal

At roughly 15 kilometres north-north-east, conditions are still marginal at Bortle 6, with the urban glow very much present. The sky improves steadily farther out, reaching Bortle 4 by around 50 kilometres and genuinely dark conditions at about 200 kilometres.

north-east - poor

Around 15 kilometres to the north-east, the sky remains poor at Bortle 7, so this is not one of the stronger escape routes from the city glow. It does improve with distance and reaches Bortle 4 at about 100 kilometres, but genuinely dark skies are not within the sampled radius in this direction.

east-north-east - marginal

At about 15 kilometres east-north-east, the sky is marginal at Bortle 6, offering only a modest improvement over the city itself. Conditions become good farther out, reaching Bortle 4 by around 50 kilometres, but genuinely dark skies are not reached within the sampled radius.

east - marginal

Roughly 15 kilometres east of Clarksville, the sky is still marginal at Bortle 6. It improves to Bortle 4 at around 100 kilometres, and genuinely dark conditions appear only much farther out, at about 200 kilometres.

east-south-east - marginal

At about 15 kilometres east-south-east, conditions are marginal at Bortle 6, so the city’s influence is still obvious. This direction is uneven nearby, but genuinely dark skies do appear farther out at around 200 kilometres.

south-east - fair

Around 15 kilometres to the south-east, the sky is fair at Bortle 5, making this a noticeably better short-drive direction than the brighter northern and north-eastern options. Even so, it does not progress to genuinely dark conditions within the sampled radius in this direction.

south-south-east - fair

About 15 kilometres south-south-east, the sky is fair at Bortle 5, so brighter deep-sky targets become more realistic than they are in the city centre. Farther out the improvement is limited, and genuinely dark skies are not reached within the sampled radius.

south - fair

Roughly 15 kilometres south of Clarksville, the sky is fair at Bortle 5. It improves to good rural conditions by around 25 kilometres, but genuinely dark skies are not reached within the sampled radius in this direction.

south-south-west - fair

At about 15 kilometres south-south-west, conditions are fair at Bortle 5, already a useful step up from the city. This is a stronger route outward, with good conditions around 25 kilometres and genuinely dark skies at about 100 kilometres.

south-west - fair

Around 15 kilometres south-west, the sky is fair at Bortle 5, so this is one of the better quick escapes from Clarksville’s glow. It improves quickly to good conditions by around 25 kilometres and reaches genuinely dark skies at about 50 kilometres.

west-south-west - fair

At roughly 15 kilometres west-south-west, the sky is fair at Bortle 5. This is an especially promising direction, with Bortle 4 reached around 25 kilometres and genuinely dark skies at about 50 kilometres.

west - fair

About 15 kilometres west of the city, the sky is fair at Bortle 5, offering a worthwhile improvement for a short outing. Conditions strengthen to Bortle 4 by around 25 kilometres and reach genuinely dark skies at about 50 kilometres.

west-north-west - fair

Around 15 kilometres west-north-west, the sky is fair at Bortle 5. This is another strong direction for getting away from Clarksville’s glow, with Bortle 4 by around 25 kilometres and genuinely dark conditions at about 50 kilometres.

north-west - poor

At about 15 kilometres north-west, the sky is still poor at Bortle 7, so the city glow remains stubbornly obvious. It does improve farther out and reaches Bortle 4 at around 50 kilometres, but genuinely dark skies are not reached within the sampled radius in this direction.

north-north-west - poor

Roughly 15 kilometres north-north-west, the sky remains poor at Bortle 7, so this is not a particularly effective short-drive direction. Conditions do improve with distance, reaching Bortle 4 around 50 kilometres and genuinely dark skies at about 100 kilometres.

zenith - poor

Straight overhead in Clarksville, the zenith is poor at Bortle 8, with a bright urban background rather than a dark, contrasty sky. The main constellations and brighter stars are still visible, but faint star fields are thinned out and the sky looks washed with light rather than truly black.

  • Near Henry County, Tennessee
    Direction
    W
    Distance (km)
    78
    SQM
    21.12
    Bortle
    4

    Bright nebulae, galaxies, narrowband imaging

  • Near Crittenden County, Kentucky
    Direction
    NNW
    Distance (km)
    106.4
    SQM
    21.10
    Bortle
    4

    Bright nebulae, galaxies, narrowband imaging

  • Near Muhlenberg County, Kentucky
    Direction
    ESE
    Distance (km)
    82.3
    SQM
    21.02
    Bortle
    4

    Bright nebulae, galaxies, narrowband imaging

Genuinely darker skies require a worthwhile drive from Clarksville rather than a quick hop beyond the suburbs.

The nearest Bortle 4 conditions are about 80 kilometres to the west near Henry County, Tennessee, with similarly strong options also available east-south-east near Muhlenberg County, Kentucky. If you head south-west or west in general, the directional data also suggest the sky improves more decisively than it does in several other directions.

  • Within 100 km
    Place
    Near Henry County, Tennessee
    Direction
    W
    Distance (km)
    78
    SQM
    21.12
    Bortle
    4
  • Within 200 km
    Place
    Near Crittenden County, Kentucky
    Direction
    NNW
    Distance (km)
    106.4
    SQM
    21.10
    Bortle
    4

Long-term trend

Clarksville’s measured sky brightness has been fairly steady over the long term, with only a slight improvement in the data. The SQM rises from 18.42 in the earliest record to 18.48 in the latest one, a very small change in practical observing terms.

Across the full series, values range from 18.38 to 18.88, with an average of 18.63. The overall trend is gently positive rather than dramatic, so city observers are still dealing with a bright urban sky, but conditions have not been racing in the wrong direction.

From within Clarksville, bright and high-contrast targets are the sensible choice. The Moon, planets, double stars and the brightest open clusters will give the most dependable results.

A small number of showcase deep-sky objects can still be tried with patience, especially when they are high in the sky, but they will lack the structure and contrast seen from darker locations. For the Milky Way, faint galaxies, large nebulae and meteor watching, a darker site outside the city makes a dramatic difference.

  • Moon
  • planets
  • double stars
  • brightest open clusters
  • Orion Nebula (M42)
  • brightest globular clusters
  • Milky Way
  • faint galaxies
  • broadband nebulae
  • meteor showers

Can you see stars from Clarksville?

Yes — you can still see plenty of the brighter stars and the main constellation patterns from Clarksville. But with a Bortle 8 sky and SQM 18.48, the fainter background stars are heavily reduced by urban skyglow.

Can you see the Milky Way from Clarksville?

Not realistically from within the city. Under Clarksville’s bright urban sky, the Milky Way is generally washed out from view.

What Bortle class is Clarksville?

Clarksville is Bortle Class 8, which corresponds to a bright city sky. That means astronomy from within the city is mainly focused on the brightest objects.

What is the SQM in Clarksville?

The measured sky brightness is 18.48 SQM. In practical terms, that is a bright urban sky rather than a dark rural one.

Where are the nearest dark skies to Clarksville?

The nearest good rural option in the supplied nearby sites is Near Henry County, Tennessee, about 78 kilometres west, where conditions reach Bortle 4. Another similar option is Near Muhlenberg County, Kentucky, about 82.3 kilometres east-south-east.

Is Clarksville good for astrophotography?

It can work for lunar, planetary and narrow-field imaging of brighter targets, but it is not ideal for faint deep-sky astrophotography from within the city. For wide-field Milky Way work or cleaner galaxy and nebula imaging, darker skies outside Clarksville are much better.

How far do you need to drive from Clarksville for darker skies?

For a clear step up, you are looking at roughly 80 kilometres to reach Bortle 4 conditions, with the nearest listed site being Near Henry County, Tennessee to the west. Some directional routes towards the west and south-west also improve quite quickly once you are well outside the urban glow.