Light Pollution Map 2026 | Bortle Scale & Dark Sky

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Light Pollution Layer

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Scientific

Opacity: 50%

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Light Pollution

2025 OBS.

-- BORTLE

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Directional Sky Brightness

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Select a map location to render the sky.

Dark

Bright

Azimuth 0°–360° (N→E→S→W), altitude 0°–90°. SQM-proxy scale.

Calculating local visibility...

Start with four inputs. Camera calibration, session limits, and the full noise budget remain available when needed.

Recommended sub-exposure

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Sky-limited

Noise budget and session details

Frames --

Usable integration --

Capture duty cycle --

Sky background -- Sensor read noise -- Dark current --

Sky rate: --
Background per sub: --
Actual read-noise penalty: --
Stack SNR efficiency: --

Calculation model

t ≥ R² / ((B + D) × ((1 + p)² − 1))

The minimum sub keeps read noise within the selected penalty above sky and dark-current shot noise. It plans frame length, not absolute target SNR.

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Per-frame noise budget

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Light Pollution Trends (2006-2025)

Analyzing trends...

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