On 17 Jun, 18:08, Paul Hyett wrote:


I tried plugging some numbers into this :

http://www.ringbell.co.uk/info/hdist.htm

... and you'd need to 800m up for the horizon to be at 100km - and I
know there's no land that high around St Ives.
--

But Lundy is not at sea level. At least, the top of it isn't (just
under 150m according to the map).