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    Double shadow    

 

One day when I was out cross-country skiing with a friend I noticed we were having double shadows. In the first picture you can clearly see that my friends left ski pole has a double shadow, but this double shadow progressively gets less noticeable further to the right. In fact, my right ski pole has no double shadow at all. Moments later, I also appeared as a double shadow while still standing at the exact same spot as in the first photo, as can be seen in the second photo. However, as far as I can see, the tree above my shadow in the second photo has no double shadow. In the third picture you can see what it looked like behind us, with the sun shining through tree tops at the other side of the marsh. My guess is that one of the tree tops managed to "split" the suns disk in two parts, creating two different light sources. After all, only objects in the partial shadow of the trees gave double shadows, but not objects in direct sunlight, like the tree above my shadow in the second photo. It would also explain why the double shadow effect would move in time, as the sun itself also moves in time.

Double shadows around my friend, but not around me. (2017-12-30)

 

Moments later, my shadow was also double. (2017-12-30)

 

What it looked like behind us. (2017-12-30)

 

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