Subject: roundup of great circle boundaries in the united states<br/>
Date: Oct 08, 2000 @ 03:40<br/>
Author: michael donner (michael donner &lt;m@...&gt;)<br/>
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<div id="ygrps-yiv-1750231005">recycled from previous messages<br/>
<br/>
1<br/>
newark ohio<br/>
ceremonial precinct<br/>
radius about 600 ft<br/>
prehistoric<br/>
earthen mound & ditch<br/>
all but complete circle<br/>
fast topo link in message 715<br/>
<br/>
2<br/>
new castle delaware<br/>
limit of enfeoffment<br/>
radius 12 miles<br/>
1681 to 1931<br/>
fragmentary<br/>
more info between messages 605 & 647<br/>
slow but comprehensive topo link encompassing all 5 arc segments at<br/>
<a rel="nofollow" target="_blank" href="http://www.topozone.com/map.asp?lat=39.6619&lon=-75.5667&s=200&size=l">http://www.topozone.com/map.asp?lat=39.6619&lon=-75.5667&s=200&size=l</a><br/>
<br/>
<br/>
<br/>
<br/>
not previously circulated<br/>
<br/>
3<br/>
cole city georgia<br/>
municipal limit<br/>
radius 2 miles<br/>
pre 1895 origin unknown<br/>
complete<br/>
this largest known circle is fully shown in a large topo at<br/>
<a rel="nofollow" target="_blank" href="http://www.topozone.com/map.asp?lat=34.9519&lon=-85.5681&s=50&size=l">http://www.topozone.com/map.asp?lat=34.9519&lon=-85.5681&s=50&size=l</a><br/>
<br/>
tangent<br/>
the topo also shows the algatn tristate point & the nearby entrance to an<br/>
immense cavern 30 yards wide & 15 feet high where chickamauga cherokees in<br/>
1794 lost the first indian war to united states troops<br/>
& by which today this only known candidate for an underground tristate<br/>
point may yet be reached for the first time<br/>
<br/>
4<br/>
rotonda west  florida<br/>
real estate development<br/>
late 20th century<br/>
radius about 8500 feet<br/>
elaborate but incomplete network of roads & channels<br/>
handsome topo at<br/>
<a rel="nofollow" target="_blank" href="http://www.topozone.com/map.asp?lat=26.8972&lon=-82.2699&s=50&size=m">http://www.topozone.com/map.asp?lat=26.8972&lon=-82.2699&s=50&size=m</a><br/>
<br/>
5<br/>
washington dc<br/>
u s naval observatory reserve<br/>
circa 1830<br/>
radius about 2100 feet<br/>
<a rel="nofollow" target="_blank" href="http://www.topozone.com/map.asp?lat=38.9219&lon=-77.0608&s=25&size=s">http://www.topozone.com/map.asp?lat=38.9219&lon=-77.0608&s=25&size=s</a><br/>
<br/>
another tangent<br/>
this observatory is the american counterpart of the one in greenwich<br/>
england for setting time standards<br/>
& it was used in the 19th century as a longitude standard as well<br/>
<br/>
in fact it was the position of this observatory a few minutes west of the<br/>
77th meridian that caused many of the longitudinal state lines in the west<br/>
such as those of wyoming & colorado to be similarly offset from integral<br/>
meridians<br/>
because boundaries used to be routinely described & marked in terms of<br/>
whole degrees west of the naval observatory<br/>
or of  the washington meridian  as it was also called<br/>
<br/>
<br/>
any other boundary circles anyone may be aware of anywhere would make<br/>
welcome additions<br/>
<br/>
m</div>