2 Measurements
In “natural sky units” (radiance relative to an assumed natural radiance of 21.6 magSQM/arcsec
2
, see
methods), the range was 0.22 - 2200 NSU. Before the introduction of anthropogenic light, the radiance of a
patch of sky near zenith on moon-free nights is likely to have been nearly always within the range 21 (galactic
center near zenith) to 24 mag/arcsec2 (very thick clouds), or 0.1 - 1.7 NSU.[1]
18
Unihedron SQM-LU-DL-V Operator’s Manual -
20211013
Summary of Contents for SQM-LU-DL-V
Page 2: ......
Page 104: ...14 Glossary 104 Unihedron SQM LU DL V Operator s Manual 20211013...
