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Re: PERIHELION etc.



http://sse.jpl.nasa.gov/planets/profile.cfm?Object=Earth&Display=Facts&System=Metric

Earth Mean Distance from Sun: 149,597,890 km
Earth Perihelion Distance from Sun: 147,100,000 km
Earth Aphelion Distance from Sun: 152,100,000 km

flux inversely proportional to square of radius

147,100,000 / 152,100,000 = 0.9767

(1/0.9767) * (1/0.9767) = 1.069

or about 7% more

other effects are obviously the angle of entry into the atmosphere of the
sunlight for observer latitude /position of sun in sky, thickness and
effects of the passage of light through atmosphere, ..