/// Can be constructed with an EAST dms-class
inline explicit longitude(const dms<east, T>& v)
: detail::graticule<T>(v.as_value())
{}
/// Can be constructed with a WEST dms-class
inline explicit longitude(dms<west, T> const& v)
: detail::graticule<T>(v.as_value())
{}
/// Can be constructed with a SOUTH dms-class
inline explicit latitude(const dms<south,T>& v)
: detail::graticule<T>(v.as_value())
{}
/// Can be constructed with a NORTH dms-class
inline explicit latitude(dms<north,T> const& v)
: detail::graticule<T>(v.as_value())
{}