I calculated the angular diameter of the Sun at the heliopause to be 0.004°. If that is correct, would the Sun appear as a disk, or like the pinpoint of light from a star?
How bright would the light from the Sun appear? I understand at Pluto the Sun appears as bright as the full moon at night on Earth. Assuming the heliopause is 3x distant from the Sun as Pluto, does that mean there would be 1/9th as bright at the heliopause. What would that brightness translate to an everyday measure?