PlaneWave 1-Meter Instructions
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Latest SQM Reading: --- ⓘ
Last Updated: N/A
SQM (Sky Quality Meter) measures zenith sky brightness in mag/arcsec².
Higher number = darker sky (less light pollution).
SQM Description Naked-eye Mag Bortle
22.0+ Pristine 7.5–8.0 1
21.8–21.9 Excellent Dark 7.1–7.5 2
21.5–21.7 Rural 6.8–7.1 3–4
21.0–21.5 Rural/Suburban 6.3–6.8 4–5
20.5–21.0 Bright Suburban 6.0–6.3 6
19.5–20.4 Suburban/Urban 5.5–6.0 7
18.5–19.4 City sky 5.0–5.5 8
< 18.0 Inner city < 5.0 9
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