From the video description:
CORRECTION: At 5:56 the slide states the equinoxes are in June and December. This should of course say March and September! D’oh!
Part three in a series taking a wry look at the idiotic belief that the Earth is flat, and how that stacks up against reality. This part continues our investigation of the Flattard Flying Spotlight, and examines the implications of the Solstices for the inhabitants of Flattardia.
Guidance: Contains some mild language within a comedy context.