Model Forum / Radio Controlled / Air Models / September 2005

Seems you are in the South Australia area (Adelaide?)

Hello,

There are the coordinates of only one point. To have a distance we need
to have two distinct points??

One point is defined by Lat and Long

Lat is South or North  0 is Equator
Do a google search loxodromy and orthodomy
Long is West or Eas  0 is Greenwich meridian

There are two ways to determine the distance between two points. It
depends of the road to joign the two points. If you go from A to B with
a constant heading it's Loxodromy , If you go by the the shortest way
(along the earth circle from A to B) it's Orthodromy.

As you should know (good formula isn't it), one degree of arc on one
great circle around earth is 60 NM long.

Distance from A to B is
3437 is a constant (1/2 Earth diameter in NM)
3437 × acos [cos (Lat A) × cos (Lat B) × cos (Long B – Long A) + sin
(Lat A) × sin (Lat B)]

Do a google search loxodromy and orthodomy

Hope to help you

MLB

Zero NM -- You only have the coordinates of one position :-)

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