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I think either kcurie's solar energy figure or my interpretation of it were off by a factor of 1000, which is not entirely surprising given the ambiguity in the meaning of the word "calorie".

Calorie - Wikipedia, the free encyclopedia

The calorie was never an SI unit. Modern definitions for calorie fall into 3 classes:

  • The small calorie or gram calorie approximates the energy needed to increase the temperature of 1 gram of water by 1 °C. This is about 4.184 joules.
  • The large calorie or kilogram calorie approximates the energy needed to increase the temperature of 1 kg of water by 1 °C. This is about 4.184 kJ, and exactly 1000 small calories.
  • The megacalorie or ton calorie[citation needed] approximates the energy needed to increase the temperature of 1 tonne of water by 1 °C. This is about 4.184 MJ, and exactly 1000 large calories.
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We have met the enemy, and it is us — Pogo
by Migeru (migeru at eurotrib dot com) on Thu Oct 25th, 2007 at 06:12:08 PM EST
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