"Jack Harrison" wrote in message
...

"Col" wrote

From this distance to the horizon calculator:

http://www.boatsafe.com/tools/horizon.htm

I love that website. It gives the answer to 15 decimal places. (that's to
an accuracy of micro metres). Wow!

Is that measuring to the front of the eye or to the back? (or to the front
of the cornea or to the back?)

Why do people persist in trying to impress Joe Publish with perceived levels
of accuracy that just aren't possible?

I don't think they are trying to 'impress' people.
Far more likely is that whatever software they use to calculate the
distances by default churns out such figures and they haven't seen
fit to correct it into something more reasonable.

Col
--
Bolton, Lancashire.
160m asl.
http://www.reddwarfer.btinternet.co.uk
http://www.reddwarfer.btinternet.co....rPictures.html