Earthlings will witness Mercury make a rare passage between our planet and the Sun on Monday, appearing as a black dot tracking the surface of the star we share with the solar system’s smallest planet.
Mercury completes an orbit every 88 days, and passes between the Earth and the Sun every 116 days, according to the Royal Astronomical Society (RAS).
But its orbit is tilted in relation to Earth’s, which means it usually appears — from our perspective — to pass above or below the Sun.
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