Many thanks to everyone who contributed to the comprehensive response to
my query.
Having spent ten hours today on that 94 metre hill today - waiting for
the sun to come out for most of the time - I can now get to grips with
the essentials before sleep overtakes me.
The Sundial Mailing List i
n the direction in which the
observer is looking but so little as to be unimportant perhaps? The sea is
only visible in a generally easterly direction.
>
>Can any list member supply the mean sea level radius of the earth at this
location on which to base the necessary trig calculation plus
On Mon, 3 Aug 1998, Tony Moss wrote:
>
> The latest question is "How far away is the sea horizon?"
Like most sundial questions this is also of imporance in navigation. How
far away the horizon is at sea depends, of course, on how far above sea
leval you are. If you are treading water with you
beta in the books. Again: D is distance to the horizon
in nautical miles; r is the mean radius of the earth ( 3440.1 nautical miles) ;
h is the height of eye IN FEET; and B is a contant relating to terrestrial
refraction, 0.8279
Seems to me that B could vary depending on atmospheric condit
27;oblate speroid' so I suppose the true
> distance varies slightly depending on the direction in which the observer is
> looking but so little as to be unimportant perhaps? The sea is only visible
> in a generally easterly direction.
>
>Can any list member supply the mean sea l
is only visible in a generally
easterly direction.
Can any list member supply the mean sea level radius of the earth at this
location on which to base the necessary trig calculation plus any subtleties I
may have overlooked as I don't have ready access to specialist reference
material of t
