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HIHmmmm...let's see: the overhead insolation at the equator - let's call it 700 W/m^2
Some factoids (mostly from the IPCC). Although the total annual average insolation remains constant for the earth over hundreds of thousands of years (even including orbit changes- and changes in sun intensity occur much slower), the LOCAL change at 60deg latitude is a seasonal variation of around ~400W/m^2.