• The Lunar Terminator • The dividing line marking the edge between day and night on the moon, shown here rotated 90° to the right. The terminator isn’t fixed on the moon. It creeps across the moon’s surface, with the change in its location noticeable in just hours to those peering through telescopes. A day on the moon lasts 29.5 Earth-days. The moon’s terminator moves a bit slower than 10 miles per hour (16 kph) across the Lunar surface. That pace seems almost glacial when you consider that, fo

The Incredible Terminator Line Separating Day and Night on Earth