Earth at Farthest Distance From Sun—Why the Heat Wave?

National Geographic writes: "It doesn't seem to make sense. The eastern United States is broiling in a dangerous heat wave, with temperatures in some cities shooting above 100 degrees Fahrenheit (38 degrees Celsius). Yet this week Earth is farther away from the sun than the planet will be at any other time during 2010.

How can that be? The answer, astronomers say, is that the distance between our planet and the sun has little do with Earth's surface temperature—and therefore almost no bearing on heat waves, blizzards, or other extreme weather."

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