BIRD POOP!
Somebody mentioned this earlier in the thread. Not sure if they were joking. But I now think it's bird poop.
Note that all these sightings come from the top of our frame and end at the bottom. Note that they come towards the camera, never away.
I was just reviewing a video from four days ago and saw the SAME THING that I saw in the video capture I posted in post #19. So I backed it up and looked again, and this time I could see it in two frames - approaching fast from a distance. Or so it seemed. So I backed up a bit more and replayed it, and then saw MORE. Like 10 secs earlier there were more of these strange objects, and several of them not aligned. It is almost like a spray.
Now I think that hawk that likes to follow me over these farms is messin' with me in more ways than one I think he's following me overhead and pooping on me.
I will post the video when I get some time.
Do birds ever purposely poop on other animals? - Quora