Invisible <voi### [at] devnull> wrote:
> scott wrote:
> >> What are your dubious assumptions?
> >
> > That all the energy from the star/light bulb comes out equally in all
> > directions in the form of 550 nm photons, and your eye has an opening of
> > 2mm x 2mm.
> >
> > Obviously all the energy doesn't come out as visible photons, and you
> > could probably do something clever with the spectrum to get a more
> > accurate figure.
>
> To say nothing of the absorption and scattering of the Earth's atmosphere...

Probably not nearly as important as the error introduced by assuming both star
and bulb emit only in the visible.

Otherwise, not such dubious assumptions at all!

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