James S. Kaplan wrote:
> How do you calculate this?
Like this.
You have to traverse the 22400 mile link from earth to satellite four
times. Ping request goes up, request comes down, reply goes up, reply
goes down.
4 * 22400 mile
--------------- = 0.480 seconds
186000 mile/sec
I pulled the 22400 mile altitude off Starband's site, and got the
speed of light from /usr/bin/units.*
> At Seiko, we had ping times of half that, going from wan to uplink
> to NOC using 64kbps frame relay.
Did this include two round trips to the bird?
--------
* Does everybody know about units? Ancient program, very cool
Just now I wanted the speed of light in miles/second. I typed
this.
% units
501 units, 41 prefixes
You have: c
You want: mile/second
* 186282.4 <--- that's the answer
/ 5.3681938e-06
You have: ^D
%
I could have done the whole problem using it, like so.
You have: 4 * 22400 * mile
You want: sec * c
* 0.48099016 <--- that's the answer
/ 2.0790446
It's good for all those freshman physics type problems where
once you match the dimensions, you have the right formula.
--
K<bob>
[EMAIL PROTECTED], http://www.jogger-egg.com/
