The Astronomical Unit - improving on 8 light minutes

For almost as long as I can remember, I've known that:

• it takes light from the Sun about 8 minutes to reach us
• the Sun is about 93 million miles away
• light travels at about 186 thousand miles per second.

However, being on the trailing edge of things, it seems to have passed me by until just now that from the last two statements, we can see that in one half second, light travels one thousandth the distance to the Sun and so it takes 500 seconds for light to travel the full distance.

That's a nice easy round number to remember and is far more precise than the rather vague 8 minutes, which neglects (about) another twenty seconds.