Disproving the flat Earth model

Sunday afternoon, April 28, 2024, the sun was very beautiful and the atmosphere was favorable.
I decided to film the sunset.
I centered the camera in order to capture the image right in the center of the screen. However, something strange occurred in the middle of this interval, the image was increasingly displaced to the left according to the vertical and horizontal arrows.
Now it remains to be seen whether with a ruler and the timelaine it would be possible to calculate an approximate speed of the Earth's rotational movement.
And does this horizontal shift to the left occur due to the tilt of the Earth's axis?
Sunset, Earth's Rotation and Axis Tilt: An Astronomical Adventure with Camera, Ruler and Timelapse
It was Sunday, May 28, 2024. A sunny afternoon, with the perfect atmosphere to capture the beauty of the sunset. With the camera in hand, you decide to immortalize this moment in a timelapse video, centering the image of the star king so that he is always in the center of the screen. But, during filming, something unexpected happens: the image of the sun begins to gradually move to the left, horizontally, as if it were moving away from the center of the screen.
Intrigued by this phenomenon, you wonder: is it possible, using a ruler and the video timeline, to calculate the approximate speed of the Earth's rotation? And would this horizontal movement to the left have any relationship with the inclination of the Earth's axis?