For kicks on my lunch break, I watched 30 seconds of the first video.

I'm assuming the video is something about why it isn't dark at noon after 1/2 year, which is explained by the difference between sidereal and solar days which are (for simplicity) ~4 minutes apart.  Because ~4 minutes multiplied by (for simplicity) ~180 days = 12 hours, there's your explanation.

Next.