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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 June 21   
      
                             Two Worlds, Two Analemmas   
           Image Credit: (left) Copyright: Tunc Tezel (TWAN) - (right):   
                             NASA/JPL/Cornell/ASU/TAMU   
      
      Explanation: Sure, that figure-8 shaped curve you get when you mark the   
      position of the Sun in Earth's sky at the same time each day over one   
      year is called an analemma. On the left, Earth's figure-8 analemma was   
      traced by combining wide-angle digital images recorded during the year   
      from December 2011 through December 2012. But the shape of an analemma   
      depends on the eccentricity of a planet's orbit and the tilt of its   
      axis of rotation, so analemma curves can look different for different   
      worlds. Take Mars for example. The Red Planet's axial tilt is similar   
      to Earth's, but its orbit around the same sun is more eccentric (less   
      circular) than Earth's orbit. As seen from the Martian surface, the   
      analemma traced in the right hand panel is shaped more like a tear   
      drop. The Mars rover Opportunity captured the images used over the   
      Martian year corresponding to Earth dates July 2006 to June 2008. Of   
      course, each world's solstice dates still lie at the top and bottom of   
      their different analemma curves. The last Mars northern summer solstice   
      was May 29, 2025. Our fair planet's 2025 northern summer solstice is at   
      June 21, 2:42 UTC.   
      
                   Tomorrow's picture: just a bowl of spherules   
        __________________________________________________________________   
      
          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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