David J Taylor wrote on 21-10-2007 12:35: > Jan Hoevers wrote: > [] >> Seen from the earth' surface that leaves a large circular area of the >> sky - centered over the pole - where no sats fly. In tropical and >> temperate zones part of that circle is below the horizon, at latitudes >> of more than 55 deg the entire circle is above the horizon, and a >> (small) part of the "opposite side of the donut" becomes visible at >> the northern horizon (southern horizon if you're down under). > [] >> hope this helps a bit, >> Jan Hoevers > > Interesting you should mention that, Jan. I've recently written a program > to try and plot one's radio horizon by recording the strengths of GPS > satellite signals, and it can be downloaded here: > > http://www.david-taylor.myby.co.uk/software/GPShorizon.zip > > The file polar-plot.jpg I included in the Zip archive shows the sky > coverage gap you described rather well.
I did a very quick search for such a pic, to confirm my theory, but didn't find. Nice picture David! Put it on the web, not in a zipfile! thanks, Jan _______________________________________________ timekeepers mailing list [email protected] https://fortytwo.ch/mailman/cgi-bin/listinfo/timekeepers
