River Lune Bridge (built as rail but now carries a road), Lune Millennium Bridge (pedestrian and cycle) and Carlisle Bridge (carrying the West Coast Main Line railway, and with a public walkway on the eastern side) which is the furthest downstream of the bridges. This part of the Lune is also the site of the old Port of Lancaster, probably a port from Roman times; the Lancaster Port Commission was established in 1750 to improve navigation on the estuary. Between 1750 and 1767, St George's Quay and New Quay were built in Lancaster and in 1779 the port facilities were extended closer
Spherical lune the second half great circle has moved a full circle, and the lune in between covers the sphere as a spherical monogon — the area formula for the spherical lune gives 4π"R", the surface area of the sphere. A hosohedron is a tessellation of the sphere by lunes. A n-gonal regular hosohedron, {2,n} has "n" equal lunes of π/"n" radians. An "n"-hosohedron has dihedral symmetry D, ["n",2], (*22"n") of order 4"n". Each lune individually has cyclic symmetry "C", [2], (*22) of order 4. Each hosohedra can be divided by an equatorial bisector into two equal spherical triangles. The visibly lighted