MSGID: 1:153/757.0 e864ee90   
   TZUTC: -0800   
   CHRS: LATIN-1 2   
                           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.   
      
                                 2023 December 18   
        A checkerboard is shown with squares colored light and dark grey. A   
      green tube sits on the board and casts a shadow. The image has a letter   
       A typed on a dark square, and a letter B types on a light square cast   
         in shadow. The question is asked if the two squares, A and B, are   
        really the same color. Please see the explanation for more detailed   
                                   information.   
      
                              The Same Color Illusion   
                    Image Credit: Edward H. Adelson, Wikipedia   
      
      Explanation: Are squares A and B the same color? They are! To verify   
      this, either run your cursor over the image or click here to see them   
      connected. The featured illusion, an example of the same color   
      illusion, illustrates that purely human perceptions in science may be   
      ambiguous or inaccurate, even such a seemingly direct perception as   
      relative color. Similar illusions exist on the sky, such as the size of   
      the Moon near the horizon, or the apparent shapes of astronomical   
      objects. The advent of automated, reproducible measuring devices such   
      as CCDs have made science in general and astronomy in particular less   
      prone to, but not free of, human-biased illusions.   
      
            APOD Year in Review (2023): RJN's Night Sky Network Lecture   
                      Tomorrow's picture: california on high   
        __________________________________________________________________   
      
          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
               NASA Official: Phillip Newman Specific rights apply.   
                   NASA Web Privacy Policy and Important Notices   
                         A service of: ASD at NASA / GSFC,   
                              NASA Science Activation   
                                & Michigan Tech. U.   
      
   --- BBBS/Li6 v4.10 Toy-6   
    * Origin: The Rusty MailBox - Penticton, BC Canada (1:153/757)   
   SEEN-BY: 1/123 15/0 90/1 105/81 106/201 123/131 128/260 129/305 134/100   
   SEEN-BY: 153/135 143 757 802 6809 7715 218/700 840 221/1 6 226/30   
   SEEN-BY: 227/114 229/110 112 113 206 307 317 400 426 428 470 664 700   
   SEEN-BY: 240/1120 266/512 282/1038 291/111 301/1 113 812 320/219 322/757   
   SEEN-BY: 335/364 341/66 342/200 396/45 460/58 128 256 1124 633/280   
   SEEN-BY: 712/848 5020/400 1042 5054/30 5075/35   
   PATH: 153/757 221/6 301/1 460/58 229/426