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A POTD is an acronym for "Photo of the Day", "Picture of the Day", "Post of the Day" or "Poll of the Day". It is a term most commonly used by online digital photography communities as an honor to outstanding photos that are selected daily from among that community's membership. They can either be tagged as POTD or displayed in a special page on that site...

Colonel Douglas H. Wheelock has uploaded all these photos to his Twitter account @Astro_Wheels. They were taken by him during his stay at the International Space Station. Douglas Harry "Wheels" Wheelock (born May 5, 1960 in Binghamton, New York) is an American astronaut and the commander of International Space Station (ISS) Expedition 25. NASA career Wheelock was assigned to the NASA Johnson Space Center in August 1996 as a Space Shuttle integration test engineer...