Hello Roger,
> Well, this idea that the amount of UV changes thoughout the season is
> something new to me and worth investigating, as you noted, with NASA or
> other public sources of sun's irradiance data on the internet.
This is probably because sunlight travels through a thicker layer of
atmosphere, when it is 'lower' than in summer. The more atmosphere light
passes through, the more it filters out UV.
Greets,
Michel van Dijk
--
Midox Color
www.midox.nl
+31 (0)70 - 71 10 353
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