### Re: ZetaTalk and Spaceguard UK (D8)

```Bill Nelson wrote:
> In sci.astro Nancy Lieder <zetatalk@zetatalk.com> wrote:
>> while out where the Concord flies or our satellites float,
>> while moving at twice the speed of the Concord, or only
>> 1/4 the speed of those satellites.
>
> The Concord flies, at maximum, at less than 12 miles above
> the surface. The lowest satellites orbit at around 100 miles.
> The geostationary satellites are at over 12,000 miles - maybe
> 18,000 (I forget). The moon is in orbit at over 200,000 miles
> distance. The Concord is not in orbit when it flies - so it
> cannot be used for comparison.

And using some other figures quoted (below), we've established, then,
for the

CONCORD:
533.33 m/s
12 miles high

SATELLITES:
7897.873415 m/s
100 miles high (lowest)

Geo Stationary
4,635.7155 m/s
12,000 - 18,000 miles high

MOON:
1023 m/s
200,000 miles high

Eric George writes:
>> Eric has kindly calculated the pace of your Moon at some
>> 1023 meters per second.. ...
>
> satellite ..  velocity would be 7897.873415 m/s.
> This is almost 15 times faster then the concord.

Eric George writes:
> circular orbit velocity is: V = C/P = sqrt(G*Me/a) ... So yes,
> geosync satellites do go faster then the moon, they are much
> closer.

Nancy Lieder wrote:
> the Britannica states to be the supersonic speed that the Concord
> flies, when breaking the sound barrier.  1,200 mph, or 1,920 km/hr,
> which is 1,920,000 m/hr, which is 32,000 m/minute or 533.33 m/s,
> is it not?  Second, if the diameter of the Earth is 12,756.27 km, then
> stationary satellites must travel 4,635.7155 m/second.```