In article , Richard J Kinch wrote:

No, your understanding is naive. Ceramics emit radiation like anything
else. Nothing absorbs IR from the darkness of outer space, because there's
no IR to absorb. A room temperature skylight window is emitting IR, not
absorbing it, on a clear night.

Actually, it's doing *both*, isn't it? I think Nick's point was that window
glass isn't nearly as transparent to IR as it is to visible light. Emissions
from an IR source inside the building will be mostly absorbed by the skylight,
instead of passing through, no? Meanwhile, the skylight will radiate IR as
well.

--
Regards,
Doug Miller (alphageek at milmac dot com)

It's time to throw all their damned tea in the harbor again.