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Unihedron Sky Quality Meters

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ixalon

ixalon

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Interesting experiment. I've added sunset/rise and astronomical sunset/sunrise markers to my graphs. It doesn't show much, but at least you can see the range in which any change is not due to the sun.

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ixalon

ixalon

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The fluctuations appear to be cloud. Attached is the graph from last night. It was a wonderfully clear night apart from between 23:50 (I was outside at this point) and 01:50 when there were various levels of cloud cover overhead.

Another nice thing about the graph is how clear it shows the effect of astronomical dawn.

I think it also shows the effect of the moon (the slight increase in darkness between the end of astronomical dusk and 23:30) - moonset was at 23:18 here last night.

post-19222-13387770105_thumb.jpg

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