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[!lemma=an] [lemma=□] □
Every degree is broken up into 60 equal pieces known as arcminutes which are similarly divided into 60 equal smaller pieces called arcseconds ( 1 arcsecond is 1/3600 of a degree ) . We can see that knots on either side of the central source that are separated by 0.9 arcseconds are easily resolved in the Keck images , but cannot be seen in the CTIO frames where they are slightly smaller than the theoretical diffraction limit . Difference of 2 spectra with blackbody at temperatures 30 C and 60 C and slit of 2 arcseconds were used . The SAURON spectrograph collects more than 1400 spectra at once over an area of 33 x 44 arcseconds ( 33 arcseconds is roughly 1/60 th of the width of the full Moon ) . The additional 43 arcseconds were a natural effect of Mercury 's motion through the spacetime curved by the Sun .