Am 03.10.2015 um 09:08 schrieb Thomas de Groot:
> On 2-10-2015 22:04, clipka wrote:
>> Am 02.10.2015 um 01:06 schrieb David Given:
>>
>>> Did you know the moon's gravitation field is
>>> lumpy? The lunar ocean varies in height by about a kilometre.)
>>
>> Well, I'm quite the "lunatic", but here's a fact that's news even to me.
>>
> 
> This is also true for our own Earth in fact. Local variations of the
> gravitational field make the oceans' surface vary by several (tens of)
> meters, sometimes over quite short distances.

I did know /that/ - but tens of meters is still quite a shot from a
kilometre.

But did you also know that fast-flowing rivers are higher in the middle
than at the banks - sometimes by as much as half a meter?

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