A summer picture for the winter solstice. Which I’d forgotten until Amy reminded me.
Refs
* Book of the New Sun. I still think Gene Wolfe does a better job of capturing the wonder of the Apollo programme with that brief paragraph that anyone else ever has.
* Dispatch from AGU: How to Understand Water Vapor Feedback – for WJI.
wmconnolley: scienceblogs.com/stoat archive 
Eli thinks John may have made a slip when he says
” Constant relative humidity means that a given patch of air has the same amount of water vapor at any given temperature.”
But the comments there are a bit dephic
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