fitcircle(1gmt) on Linux
The text 1b9154951549, as Debian 8 (Jessie), Debian 7 (Wheezy), Debian 6.0 (Squeeze), Debian 5.0 (Lenny), Debian 4.0 (Etch), Debian 3.1 (Sarge) shipped it.
find mean position and pole of best-fit great [or small] circle to points on a sphere.
Flags it lists
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-: -
-H -
-L -
-S -
-V -
-bi