I understand your uncertainty, watch24, to the river that seems leaning. The reason is simple. As you read my post above, you would have seen that the picture is taken with a 24X36 camera and a ultra wide angle lens (18 mm), which causes a significant distortion in the picture. The purpose of this photo is to show the Big Dipper, the moon bow and the waterfall. Framing with the waterfall on the right necessarily tipped it. During the shooting, the camera has been tilted so that the waterfall is vertical. I think you would have been even more shocked if the water of the waterfall would not have flowed vertically ... . Of course, we could correct this distortion with software, but in this case the frame would be severely reduced.
PeturGauti and watch24, before you say that this photo is, or may be, a fake, it would be agreed to look at the two time-lapse attached to my post above.
I also had an annotated version that I have not had time to send:
And a larger version here:
www.nuitsacrees.fr/DP/AP/apskogar_1200annotated.jpg
Thank you to everyone who liked this picture and who informed me by mail or on this thread.
Stephane