Sky quality meter readings: sharing our October dataset

We finished the October round of measurements at eleven points in the municipality. Average zenith reading was 21.2 mag/arcsec², with the worst point at 19.8 next to the industrial estate and the best at 21.6 on the ridge.

Two observations that may be useful for others:

• Readings taken before 22:30 are consistently 0.2 to 0.4 magnitudes worse, almost certainly because of cars leaving the town.
• The difference between the two sides of the same hill is bigger than the difference between seasons, which says a lot about where lighting actually goes.

Happy to share the raw file if anyone wants to compare methodology.