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Symbol Glossary

$\phi$         Geodetic latitude
$\theta$ Reduced latitude, defined by Eqn. (2)
$L$ Longitude (difference)
$\alpha$ azimuths, clockwise from N ($\alpha_0$ at equator)
$s$ arc-length along geodesic
$\lambda$ longitude (difference) on auxiliary sphere
$\sigma$ arc-length on auxiliary sphere
$a$ major (equatorial) radius of ellipse
$b$ minor (polar) radius of ellipse
$f$ flattening $b=a(1-f)$
$e$ eccentricity $b^2=a^2(1-e^2)$

Ed Williams