Re: IS THE GALILEO SYSTEM IN JEOPARDY?

On Wed, 14 Feb 2007 19:11:54 -0500, "John R. Copeland"
<jcopelan@xxxxxxxxxxxxxxxxxxx> wrote:

Your "illumination" explanation agrees with what I said, Alan.

Only for a source at infinite distance.

However, the GPS satellites are not and the calculation is required to
work out their angular coverage. If you do that you'll find that from
the poles a GPS satellite above the equator is just below the horizon.

I think we're in danger of going round in circles so I'll stop there :-)

--
Alan White
Twenty-eight miles NW of Glasgow, overlooking Lochs Long and Goil in Argyll, Scotland.

Webcam and weather:- http://windycroft.gt-britain.co.uk/weather
.