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From: "Lubomir Vlcek" <lubovlcek@stonline.sk>
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Subject: Nomenclature  and  Terminology
Date: Sun, 24 Nov 2002 12:14:13 +0100
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Nomenclature  and  Terminology

     Horizontal line is not horizontal straight line.
Horizontal line is horizontal  circle (quasi-circle) with radius  R = 6378
km.

Railway  straight line  is not  straight line in geometry.
Railway  straight line  is  horizontal circle (quasicircle).
A.Einstein  [3]  wrong write: Railway  straight line is straight line in
geometry  (planimetry).

Vertical line is straight line in geometry.

Horizontal surface is horizontal sphere.
Horizontal level is horizontal surface and horizontal sphere but is not
horizontal plane.
Geometrical plane is not  sphere.

Mathematical straight line in not horizontal curve.
Plain trajectory is quasi-circle and not straight line.
Ship trajectory is quasi-circle and not straight line.



*Corresponding author:  e-mail: lubovlcek@stonline.sk




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