Book:    Men at Arms
Viewed: 81 - Published at: 6 years ago

And give me some coffee. Black as midnight on a moonless night."
Harga looked surprised. That wasn't like Vimes.
"How black's that, then?" he said.
"Oh, pretty damn black, I should think."
"Not necessarily."
"What?"
"You get more stars on a moonless night. Stands to reason. They show up more. It can be quite bright on a moonless night."
Vimes sighed.
"An overcast moonless night?" he said.
Harga looked carefully at his coffee pot.
"Cumulus or cirro-nimbus?"
"I'm sorry? What did you say?"
"You get city lights reflected off cumulus, because it's low lying, see. Mind you, you can get high-altitude scatter off the ice crystals in--"
"A moonless night," said Vimes, in a hollow voice, "that is as black as coffee.

( Terry Pratchett Pratchett )
[ Men at Arms ]
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