03 Jan

Bad Astronomy – At the bottom of Earth’s orbit

Since last July, the Earth has been falling ever closer to the Sun. Every moment since then, our planet has edged closer to the nearest star in the Universe, approaching it at over 1100 kilometers per hour, 27,500 km/day, 800,000 km every month.

But don’t panic! We do this every year. And that part of it ends today anyway.

The Earth’s orbit around the Sun is not a perfect circle. It’s actually an ellipse, so sometimes we’re closer to the Sun, and sometimes farther away. Various factors change the exact date and time every year — you can get the numbers at the Naval Observatory site — but aphelion (when we’re farthest from the Sun) happens in July, and perihelion (when we’re closest) in January.

via Bad Astronomy – At the bottom of Earth’s orbit. Just a little bit of science for tonight.

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