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                           Astronomy Picture of the Day   
      
       Discover the cosmos! Each day a different image or photograph of our   
         fascinating universe is featured, along with a brief explanation   
                       written by a professional astronomer.   
      
                                   2025 March 16   
       An image of the Sun in three colors of ultraviolet light showing the   
       transit circle of Venus and a deep coronal hole in dark blue. Please   
                see the explanation for more detailed information.   
      
                       Venus and the Triply Ultraviolet Sun   
           Image Credit: NASA/SDO & the AIA, EVE, and HMI teams; Digital   
                            Composition: Peter L. Dove   
      
      Explanation: This was a very unusual type of solar eclipse. Typically,   
      it is the Earth's Moon that eclipses the Sun. In 2012, though, the   
      planet Venus took a turn. Like a solar eclipse by the Moon, the phase   
      of Venus became a continually thinner crescent as Venus became   
      increasingly better aligned with the Sun. Eventually the alignment   
      became perfect and the phase of Venus dropped to zero. The dark spot of   
      Venus crossed our parent star. The situation could technically be   
      labeled a Venusian annular eclipse with an extraordinarily large ring   
      of fire. Pictured here during the occultation, the Sun was imaged in   
      three colors of ultraviolet light by the Earth-orbiting Solar Dynamics   
      Observatory, with the dark region toward the right corresponding to a   
      coronal hole. Hours later, as Venus continued in its orbit, a slight   
      crescent phase appeared again. The next Venusian transit across the Sun   
      will occur in 2117.   
      
                            Tomorrow's picture: big hat   
        __________________________________________________________________   
      
          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
               NASA Official: Amber Straughn Specific rights apply.   
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                                & Michigan Tech. U.   
      
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