making the duration of day and night equal. There is no tilt in Earth’s axis with respect to the sun, which is perpendicular to the orbit, and therefore, the terminator line runs parallel to ...

Video transcript for 'Day and night' SEYMOUR ... month for the moon to go all the way around the Earth in a circle, SEYMOUR: we call this an orbit! ROSIE: and then it take a whole year for ...