At last I look to the moon; it hangs fixed and full in the east, emormously scrubbed and simple. Our own hometown ultima moon. It must have been a wonderful sight from there, when the olive continents cracked and spread, and the white ice rolled down and up like a window blind. My eyes feel cold when I blink; this is enough of a walk tonight. I lack the apparatus to feel a warmth that few have felt --- but it's there.
According to Arthur Koestler, Kepler felt the focused warmth when he was experimenting on something entirely different, using concave mirrors. Kepler wrote, "I was engaged in other experiments with mirrors, without thinking of the warmth; I involuntarily turned around to see whether somebody was breathing on my hand." It was warmth from the moon.
--- From Pilgrim at Tinker Creek
©1974 Harper & Row