A few days ago, NASA’s solar dynamics observatory gave us a very weird phenomenon: the moon, after passing the sun, seems to have retraced its orbit and went on the reverse. But apparently this is nothing new.
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The Moon’s unusual apparent behavior during this particular transit is a phenomenon similar to retrograde motion: When a celestial object appears to move backwards because of the way that different objects move at different speeds at different points in their orbits.
(Image credit: NASA/Goddard/SDO)