• 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

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