Re Radius of the Earth

1998-08-04 Thread Tony Moss
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

Re: Radius of the Earth

1998-08-03 Thread Thibaud Taudin-Chabot
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

Re: Radius of the Earth

1998-08-03 Thread Uncle John
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

Re: Radius of the Earth

1998-08-03 Thread Dave / Susan
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

Re: Radius of the Earth

1998-08-03 Thread Richard Langley
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

Radius of the Earth

1998-08-03 Thread Tony Moss
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