I recently heard from a rabbi that people (in the Zohar's view) were standing on the Earth's sphere both above and below, and while it was day for some, it was night for others and vice versa. If its true, I would like to know where in the Zohar this statement or idea comes from.
זוהר ויקרא דף י עמוד א
Rough translation: The whole world revolves in a circle like a ball, some are on top and some are on the bottom, and the people in different places have different appearances from each other due to the different atmospheres. And this allows that while it is light for these, it is dark for these, for these day and for these night, and there is a place where it is light all the time except for a brief period.