cosmolog

you're a poet you're a locomotive
out of fashion like fig. 1
a poet is a locomotive is a galaxy
one that looks like ours to someone living
in another galaxy
now the radiance of yourself you call it nothing
perhaps maybe call it the dinner you made
of which you were so proud,
call it luminosity, which is one factor.
the other being how distant you are from me.
A poet'll work out the luminosity and the distance
to figure out exactly how bright you are.
conversely, if you knew the luminosity of other poets
in the galaxy (to keep it simple     )
you can work out their distance from you
by measuring their apparent brightness