Re: How fast?

"Mike Williams" <nospam@xxxxxxxxxxxxxxxxxx> wrote in message
news:KFZxOLAsJC9DFwfD@xxxxxxxxxxxxxxxxxxxxx
| Wasn't it Laury who wrote:
| >I was trying to find out how fast I am travelling when I stand
still.
| >
| >I discovered:
| >Earth rotation is 1000 mph at equator(0.3 miles/s)
| >Earth moves round sun 18.5 m/s (66,000 mph)
| >Sun moves round galaxy 155 m/s galaxy
| >Galaxy moves wrt local cluster 185 m/s.
| >
| >But couldn't find out what the various directions are. What I need
to
| >know still are:
| >1. At what time of year do we move round the sun in the 'same'
| >direction as the sun is moving round the galaxy; and what is the
angle
| >between thes motions?
| >2. What is the angle between the motion round galaxy, and the motion
| >wrt local cluster.
| >
| >Anyone know where I can find this?
|
| A different way to find out how fast you're travelling when standing
| still is to measure the Doppler effect caused by your motion on the
| frequency of the cosmic background radiation.
|
| At present that gives an average speed of about 371 km/sec. That
figure
| will include the motion of the solar system around the galaxy and the
| overall motion of the galaxy, but it won't include the Earth's orbital
| motion or rotation. Unfortunately, I can's seem to find any info about
| the direction, other than that the direction was first calculated by
| observations made from the Bracewell radio telescope at Stanford.

Thanks, that's useful because my next question might well have been
'anyone know how fast the local cluster is moving?' And so on ad
infinitum.

So it looks like I can use 371km/s (220ish miles/sec) plus/minus earth
rotation & orbit figures, modified by the 67 degs which Charles
supplied.


--
Laury




.

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