Just what the title states
Some part or the other of this Globe faces approximately towards the Sun during each 24 hour period. What is the total amount of heat (in calories) incident on average during this 24-hour period?
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Ask Wolfram Alpha and Wikipedia
So, multiply cross-section by power and divide by the surface area to get approximately 340 Watts average power at the cloud tops.
Conversion to calories is left as an exercise.