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Old 06-12-2016, 04:12 PM
Stranger On A Train Stranger On A Train is online now
Join Date: May 2003
Location: Manor Farm
Posts: 17,273
Originally Posted by Mangetout View Post
Variation in the orbit doesn't necessarily indicate lack of sensitivity

What matters is probably not the momentary condition, but the average of all the various states. Sure, the distance between the earth and sun varies throughout the year, but if you move the earth so that on average, it's a few million kilometers closer or further away than the current average, we might run into trouble.
"...a few thousand kilometres nearer or further from the sun" is not going to significantly change the thermodynamic state of the Earth, and even a few million is not going to make the planet uninhabitable. The sun goes through phases in variation of irradiance and temperature.