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Robert wrote:

Thank you very much for your detailed reply. I had checked Meeus' 'Morsels'
but not his 'Astronomical Algorithms'.

The numbers are accurate enough for my purpose. As the obliquity of the
ecliptic is currently slowly diminishing, the arctic and tropical circles
are moving away from each other at circa 30 metres per year, so greater
accuracy would be meaningless.

I read some where that because of this the polar and tropical regions are
diminishing in size at a rate of 470 and 1080 sq km per year.

In consequence, the temperate region grows at a rate of 1550 sq km per year.
Now, who knows a country, state, island or lake of roughly the same size?

Rob van Gent

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Hebert wrote:

For the next ten years to come it's much worse. The distance will have
increased by some 1.4 km in July 2016. (Then it should shrink for a
while. We currently happen to be at a peak of positive nutation.) Even
so, that still amounts to no more than half the size of Austria in those
ten years.

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Perhaps a dumb a_s question implying a non-existent correlation, but could
a growing temperate region also be known construed as global warming in the
arctic region?  We hear about that in the news, but nothing about
Antarctica.

Bill




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