"fer j. de vries" <[EMAIL PROTECTED]> writes: > Some members of this list have drawn an east-west line at the september = > equinox. > But what accuracy this line will have? > > Assuming a perfect horizontal plane, ... > ... > A line between these 2 points has an angle of 0.067 degrees to the = > east-west line.
It is interesting to note that this source of error isn't limited to the equinox. The usual mark-two-shadow-crossings-on-a-circle method is also affected, except near the solstices. --Art Carlson
