Every day between 10am and 11am, I see a drop in the UV/Brightness on my Sky unit. I was thinking it was a shadow from somewhere though I couldn’t think of where. I’ve been meaning to post about this for a while but I never seemed to be home (or, more importantly, remember) to take some pictures of the station while the drop was happening… but this week I finally remembered and now I’m a bit more puzzled.
Here’s what the drop looks like on my station:
Here are 4 photos of my sky unit (from 10:30am to 11:20am):
And for grins and giggles and to show that this happens most every non-cloudy day, here’s what it’s looked like over the last 4 months (you can see it in that darker orange stripe that goes across):
Based on the photos, the only thing that I can figure could be casting any kind of shadow on the sensor is one of the bamboo skewers I put on to keep the birds away, but those seem awfully slender to cause such a measurable drop.
Any thoughts, comments, suggestions?