In an article "Meet the world's director of time" at
[Only registered users see links. ]
BBC News Magazine writes
"That would be fine if the earth kept good time, but in fact it
doesn't. The earth's rotation rate changes every day by thousands of
nanoseconds, and this is due in a large part to wind.
When winds push against mountain ranges, they can either speed up or
slow down the rate of spin of the solid ground, transferring that spin
into the atmosphere."
I find this hard to believe. Here some naive thoughts:
* Water pushing against beaches would carry a lot more energy.
* Most wind is caught in leaves which are not going to pass on the
* Wind is part of a circulation, so you need to take the whole cycle
into account. "Can't make a boat move by sitting in it and blowing the
I don't know that much about physics. Does anyone know a reference?
What do you say?
Depends upon where you are. There are Westerlies, Easterlies,
NE Trades, and SE Trades. Also the convection cells driven by
temperature differences between the equatorial regions and
the poles and which are bent by coriolis forces.
Daily and seasonal shifts in wind patterns (like the jet stream)
move rotational inertia and angular momentum around.
"Stephan Wehner" <[Only registered users see links. ]> wrote in message
news:[Only registered users see links. ]...
Good. The clueless dork that wrote that has never heard of Newton's third
Here some naive thoughts:
I'd say "Can't make a boat move by sitting in it and blowing the
sails", the same as you. So would Newton.
The reference is [Only registered users see links. ]
but Newton wrote it in Latin which may not help.
An English translation would be "for every action there is an equal and
A variation in time as measured by the position of the Earth relative to
the vast majority of "fixed" stars will occur whenever the Earth's orbit is
perturbed, as it always will be by the changing position of the other
planets. That GPS guff can only be nonsense, GPS receivers do not
carry atomic clocks and these days every taxi or lorry driver has a
Tom Tom or Garmin - or is getting one as a Xmas prezzy from his
dearly beloved, they are getting really inexpensive.
"Greg Neill" <[Only registered users see links. ]> wrote in message
news:49353fe4$0$5537$[Only registered users see links. ] ...
Also wind patterns can work to move water between pole and equator and vv
which I would expect to have a mesurable effect on the Earth's angular
speed, particularly if measured on a timescale of days/weeks rather than
accroding to the nasa Because of Earth’s dynamic climate, winds and atmospheric pressure systems experience constant change. These fluctuations may affect how our planet rotates on its axis, according to NASA-funded research that used wind and satellite data.