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- Dec 22, 2012
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Does it matter?
I mean.. it’s like the question ‘is the earth a sphere?’.
Yeah. It is. Maybe not quite perfect, but for practical purposes... yes. The real question is ‘ Is it a perfect sphere?’.
It matters plenty. The earth receives approximately 6-7% more solar energy in early January than it does in early July. The southern hemisphere receives the most radiance at this time due to the earths tilt. The southern hemisphere is about 80% water and 20% land, so the way it absorbs this energy is significantly different. In early July, when the norther hemisphere is facing the sun, it is about 40% land and about 60% water.
Very significant difference when calculating energy balances, if the models use the adjusted to 1 AU numbers as found.