Consider the size of the sun: it&#x27;s not a point source. Even if it was, the &quot;seeing&quot; (astronomical term for sharpness of objects in the sky) is usually on the order of arcseconds at night, probably much more (due to convection) during the day. So even with image-forming optics, 1 sec temporal resolution is very tricky. (earth turns 15 arcseconds in one second)