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A presumably knowledgeable correspondent tells me that actually, if you do the calculations, it turns out that it would be the other way around (on average, the sun is closer to the hub than the rim, so the hub would be warmer).

Do not feel obliged to take his word for it, though. ‘Discworld Mechanics’ is one of alt.fan.pratchett’s favourite Perennial Discussion Topics, and I don’t think that any two given participants in such a thread have ever managed to agree on anything definite about the way in which the Discworld might ‘work’. See also the The Turtle Moves! section in Chapter 5 for more information about the physical aspects of the Discworld.

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