In article , tony sayer



1) From wherever in space you pick up the signals from a 'point source'
the radiation always seems to come from the same point source location.

An Isotropic radiator in fact!....

Yes. Although that isn't reserved for point sources. I was going to say
that The Sun is a 'blindingly obvious' pun example of an extended source
which approximate being an isotropic radiator. However I've seen no sign of
it today due to rain and cloud, so am relying on hearsay to assume it still
exists. :-)

Slainte,

Jim

--
Electronics http://www.st-and.ac.uk/~www_pa/Scot...o/electron.htm
Audio Misc http://www.audiomisc.co.uk/index.html
Armstrong Audio http://www.audiomisc.co.uk/Armstrong/armstrong.html