Inside outside rainbows

One fine afternoon
two rainbows
in a sky turning pale

one bright bold rainbow
with blue inside, red outside
and one fainter rainbow outside
with blue outside, red inside

And above the two rainbows
a half moon
the same shape as the rainbows
but not concentric
and no color

A few afternoons later
two rainbows as before
blue inside the inside
and outside the outside

This time the moon was fuller
and inside the inside rainbow
not concentric but a lot closer
and I remember the sky
a deepening light blue